JP7360068B2 - Composite parts - Google Patents

Description

The present invention relates to a composite member.

In recent years, the market share of organic EL displays has been increasing. An organic EL display is a display that utilizes the fact that a light-emitting material contained in an organic EL element receives energy and enters an excited state, and then emits light when returning to a ground state. When the temperature of an organic EL element changes, the band gap of the light emitting material changes, resulting in a change in the color of the emitted light. In order to prevent such a change in emitted light color, uniformity of heat within the plane of an organic EL display panel, which is an assembly of organic EL elements, is important. In order to achieve such thermal uniformity, in organic EL displays, aluminum is often attached to the organic EL display panel (for example, see Patent Document 1 below). However, since aluminum alone lacks rigidity, in recent years, laminated members having a material composition of aluminum/resin/aluminum have been attached to organic EL display panels.

Such a laminated member is required to have good surface flatness because an organic EL display panel is attached to one surface thereof. Furthermore, from the perspective of life cycle assessment, weight reduction is also required in order to reduce carbon dioxide generated during transportation. As this index, specific stiffness (rigidity per unit mass) is determined. Furthermore, in recent years, as market competition for organic EL displays has become more intense, there has been a trend toward lower costs for the components that make up organic EL displays.

Here, since aluminum is an expensive metal, in order to reduce the cost of the member, it is sufficient to consider reducing the amount of aluminum used while ensuring rigidity. To this end, it is possible to replace some of the aluminum with iron, which is a metal that has rigidity but is cheaper than aluminum, and to create a laminated member made of aluminum/resin/iron. I can do it. As a laminated member made of such materials, for example, Patent Document 2 below discloses a laminated member having a metal material/resin/metal material configuration, and examples of metal materials include aluminum, steel, plating, etc. Examples include steel plates. Further, for example, Patent Document 3 below discloses a laminated steel plate for a reflective plate having a configuration of aluminum foil/resin/steel plate.

Japanese Patent Application Publication No. 9-314734 U.S. Patent No. 4,313,996 Japanese Unexamined Patent Publication No. 58-31745

Here, in Patent Document 2, various metal materials are exemplified, and a combination of aluminum/resin/iron may also be considered. However, what is specifically studied in this document is only the combination of the same types of metal materials, and the combinations of different types of metal materials are only exemplified.

Further, since the laminated steel plate disclosed in Patent Document 3 is for use as a reflector, aluminum foil is used to ensure appropriate optical properties. However, the laminated member as described above is not only exposed to heat radiated from a device that generates heat during operation, such as an organic EL display panel, but is also required to have thermal uniformity. In this case, the laminated member is required to have a heat conduction of a predetermined amount or more, so it is difficult to achieve the desired heat conduction with aluminum foil such as the one used in Patent Document 3 because of its small thickness. Become. From this point of view, the present inventors have found that it is important to increase the thickness of aluminum used in the laminated member to a certain extent.

On the other hand, aluminum and iron (steel plates) that make up the laminated member have different coefficients of linear expansion, and the coefficient of linear expansion of aluminum (23.0×10 ^-6 /℃) is higher than that of iron. It is larger than the expansion coefficient (12.1×10 ⁻⁶ /°C) (that is, aluminum expands more easily). In the case of aluminum foil as in Patent Document 1, the thickness of the aluminum is extremely thin compared to the thickness of the steel plate, so there is no need to consider the difference in linear expansion coefficient as described above. However, as found by the present inventors, by increasing the thickness of aluminum, the above-mentioned difference in linear expansion coefficient comes to have a significant effect. When these materials are exposed to heat during manufacture or use of the laminated member, shape changes (more specifically, warping) occur due to differences in linear expansion coefficients. More specifically, during manufacturing, the shape changes due to the heat of the resin in a molten state, and during use, the shape changes due to heat transfer from the device that generates heat during operation.

As described above, there is a trade-off between the thermal uniformity of the member and the suppression of shape change during manufacture and use. Therefore, the present inventors were able to more reliably suppress the shape change during manufacturing and use, and further improve the flatness of the member, while achieving heat uniformity and low cost as a member. We newly learned that new technology is required.

In addition, when fixing a component to a device that generates heat during operation, fixing means such as screws are often used. Processing such as deep drawing is generally performed. Therefore, in addition to the above-mentioned characteristics, it is thought that workability is also required for the member.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to realize processability, heat uniformity, and low cost while minimizing changes in shape during manufacturing and use. It is an object of the present invention to provide a composite member that can be reliably suppressed and further improve the flatness of the member.

In order to solve the above problem, the inventors of the present invention conducted intensive studies and found that by satisfying specific conditions for the thickness of the aluminum plate and steel plate, the thermal uniformity and shape, which have a trade-off relationship as described above, can be improved. The inventors came up with the idea that it is possible to achieve both suppression of change and completed the present invention.
The gist of the present invention, which was completed based on this knowledge, is as follows.

(1) A composite member comprising an aluminum plate, a steel plate, and a resin layer interposed between the aluminum plate and the steel plate, and used in equipment including a device that generates heat during operation, wherein the thickness of the aluminum plate is t _A is 0.20 to 1.60 mm, the thickness t _B of the steel plate is 0.15 to 1.20 mm, and the total thickness t _T of the composite member is 1.50 to 5.00 mm. A composite member, wherein the thickness _tA of the aluminum plate is greater than or equal to the thickness _tB of the steel plate , and the steepness calculated from the following formula is 2.0% or less .
Steepness (%) = (maximum strain of composite member/pitch where strain appears) x 100
(2) The composite member according to (1), wherein the flatness of the composite member is such that the maximum strain in any direction is 3.0 mm or less.
(3) The composite member according to (1) or (2), wherein the flatness of the composite member is such that the maximum strain in any direction is 2.0 mm or less.
(4) The ratio t _A /t _B of the thickness t _A of the aluminum plate to the thickness t _B of the steel plate is 1.10 to 3.30, described in any one of (1) to (3). composite member.
(5) The thickness t _A of the aluminum plate, the thickness t _B of the steel plate, and the overall thickness t _T of the composite member satisfy the relationship (t _A + t _B )/t _T ≦0.65. The composite member according to any one of (1) to (4).
(6) The composite member according to any one of (1) to (5), wherein the resin layer contains a polyethylene resin or an epoxy resin.
(7) The composite member according to any one of (1) to (6), wherein the resin contained in the resin layer has a glass transition point Tg of 0° C. or lower, or 50 to 180° C.
(8) The ratio E'/E'' of the dynamic storage modulus E' and the dynamic loss modulus E'' at 100°C of the resin contained in the resin layer is 0.20 to 20.0. The composite member according to any one of (1) to (7).
(9) Any one of (1) to (8), further comprising an adhesive layer between the resin layer and the aluminum plate, or between the resin layer and the steel plate. Composite member described in.
(10) The steel plate has a plating layer located on at least one surface and a coating layer located on the plating layer, according to any one of (1) to (9). Composite member as described.
(11) The composite member according to any one of (1) to (10), wherein the surface of the aluminum plate is used so as to be in contact with at least a portion of the heat generating device.

As explained above, according to the present invention, while achieving workability, heat uniformity, and low cost, shape changes during manufacturing and use are more reliably suppressed, and the flatness of the member is further improved. becomes possible.

FIG. 1 is an explanatory diagram schematically showing an example of a composite member according to an embodiment of the present invention. It is an explanatory view showing typically an example of a composite member concerning the same embodiment. It is an explanatory view showing typically an example of a composite member concerning the same embodiment. It is an explanatory view showing typically an example of a composite member concerning the same embodiment. It is an explanatory view showing typically an example of the steel plate in the composite member concerning the same embodiment. It is an explanatory view showing typically an example of the steel plate in the composite member concerning the same embodiment. It is a flowchart which showed an example of the flow of the manufacturing method of the composite member concerning the same embodiment. FIG. 2 is an explanatory diagram schematically showing the configuration of a device using a composite member according to the same embodiment. It is a schematic diagram for demonstrating the measuring method of the shape change during use.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Note that, in this specification and the drawings, components having substantially the same functional configurations are designated by the same reference numerals and redundant explanation will be omitted.

(About composite parts)
<About the overall structure of the composite member>
First, the overall structure of a composite member according to an embodiment of the present invention will be described with reference to FIGS. 1A to 1D. 1A to 1D are explanatory diagrams schematically showing an example of a composite member according to this embodiment. Note that in FIGS. 1A to 1D, each figure is enlarged or reduced as appropriate for ease of explanation, and the figures do not show the actual size and ratio of each part.

As shown in FIG. 1A, the composite member 1 according to the present embodiment includes an aluminum plate 10, a steel plate 20, and a resin layer 30 interposed between the aluminum plate 10 and the steel plate 20. Therefore, the composite member 1 can be called an aluminum-resin-steel (or iron) laminate plate (or composite plate).

The aluminum plate 10 is not particularly limited except for the conditions regarding the thickness described below, and various aluminum plates can be used. Here, the aluminum plate may be made of pure Al or may be made of various aluminum alloys. Further, the shape of the aluminum plate 10 is not particularly limited either, and can be appropriately set according to the object for which the composite member 1 is used.

Note that the conditions regarding the thickness of the aluminum plate 10 will be explained again below.

The steel plate 20 is not particularly limited except for the conditions regarding the thickness described below, and various steel plates can be used depending on the mechanical strength etc. required of the steel plate 20. Examples of such a steel plate 20 include Al-killed steel, ultra-low carbon steel containing Ti, Nb, etc., high-strength steel containing ultra-low carbon steel further containing reinforcing elements such as P, Si, Mn, etc. Various steel plates can be mentioned. Further, as the steel plate 20, it is also possible to use various alloy steel plates such as a stainless steel plate. Furthermore, the shape of the steel plate 20 is not particularly limited either, and can be appropriately set depending on the object for which the composite member 1 is used.

Note that various conditions including the thickness of the steel plate 20 will be explained again below.

The resin layer 30 is a layer located between the aluminum plate 10 and the steel plate 20. As mentioned above, the aluminum plate 10 and the steel plate 20 have significantly different coefficients of linear expansion, and due to the difference in coefficient of linear expansion, the shape change due to heat occurs during manufacturing and use of the composite member 1. may occur. However, as will be described in detail below, since the aluminum plate 10 and the steel plate 20 have a specific thickness and the resin layer 30 is present with an appropriate thickness between the aluminum plate 10 and the steel plate 20, the aluminum It becomes possible to reduce the difference in linear expansion coefficient between the plate 10 and the steel plate 20 and suppress the occurrence of shape change.

Note that the conditions required for the resin layer 30 will be explained in detail below.

Furthermore, as shown in FIGS. 1B to 1D, the composite member 1 according to the present embodiment has at least one of the following: between the resin layer 30 and the aluminum plate 10, or between the resin layer 30 and the steel plate 20. , may further include an adhesive layer 40. By further providing such an adhesive layer 40, the adhesion between the resin layer 30 and the aluminum plate 10 and between the resin layer 30 and the steel plate 20 can be further improved.

The adhesive layer 40 will also be explained below.

<About the thickness of each layer of composite member 1>
Next, the thickness of each layer constituting the composite member 1 will be explained in detail. In the following explanation, as shown in FIGS. 1A to 1D, the thickness of the aluminum plate 10 is expressed as _tA , the thickness of the steel plate 20 is expressed as _tB , and the overall thickness of the composite member 1 is expressed as _tT . shall be.

In the composite member 1 according to the present embodiment, the thickness t _A of the aluminum plate 10 is 0.20 to 1.60 mm, the thickness t _B of the steel plate 20 is 0.15 to 1.20 mm, and the composite member 1 The overall thickness t _T is 1.50 to 5.00 mm, and the thickness t _A of the aluminum plate 10 is greater than or equal to the thickness t _B of the steel plate 20. By satisfying these four conditions, the composite member 1 according to the present embodiment achieves heat uniformity and low cost, while more reliably suppressing shape changes during manufacturing and use, and It becomes possible to further improve the flatness of the member.
The above conditions will be explained in more detail below.

[ _tA : 0.20 to 1.60mm]
In the composite member 1 according to this embodiment, the thickness _tA of the aluminum plate 10 is 0.20 to 1.60 mm. If the thickness _tA of the aluminum plate 10 is less than 0.20 mm, the thermal conductivity required for the composite member 1 as a whole is insufficient, so that the thermal uniformity of the composite member 1 as a whole cannot be achieved. By setting the thickness _tA of the aluminum plate 10 to 0.20 mm or more, it becomes possible to realize the thermal uniformity required for the composite member 1. The thickness _tA of the aluminum plate 10 is preferably 0.30 mm or more, more preferably 0.40 mm or more, and still more preferably 0.50 mm or more. On the other hand, if the thickness _tA of the aluminum plate 10 according to this embodiment is more than 1.60 mm, a large amount of aluminum, which is an expensive metal, will be used, making it impossible to achieve low cost. By setting the thickness _tA of the aluminum plate 10 to 1.60 mm or less, it is possible to achieve desired thermal uniformity while maintaining low cost. The thickness _tA of the aluminum plate 10 is preferably 1.20 mm or less, more preferably 1.00 mm or less.

[ _tB : 0.15-1.20mm]
In the composite member 1 according to this embodiment, the thickness t _B of the steel plate 20 is 0.15 to 1.20 mm. If the thickness _tB of the steel plate 20 is less than 0.15 mm, the required rigidity of the composite member 1 as a whole cannot be achieved. By setting the thickness t _B of the steel plate 20 to 0.15 mm or more, it becomes possible to realize the rigidity required for the composite member 1 as a whole. The thickness t _B of the steel plate 20 is preferably 0.20 mm or more, more preferably 0.30 mm or more, and even more preferably 0.40 mm or more. On the other hand, if the thickness _tB of the steel plate 20 exceeds 1.20 mm, the thickness of the aluminum plate must also be increased as described later. As a result, the strength of the composite member increases and press workability decreases. By setting the thickness _tB of the steel plate 20 to 1.20 mm or less, it is possible to achieve uniform heat uniformity, rigidity, and press workability. The thickness t _B of the steel plate 20 is preferably 1.00 mm or less, more preferably 0.80 mm or less, and still more preferably 0.60 mm or less. In addition, when using various steel plates having a plating layer or a coating layer on the surface of the base steel plate as described below as the steel plate 20, the overall thickness including these plating layers and coating layer is The thickness of the steel plate 20 is assumed to be _tB .

[ _tA ≧ _tB ]
In the composite member 1 according to the present embodiment, the thickness _tA of the aluminum plate 10 and the thickness _tB of the steel plate 20 are within the above range, and further, the thickness _tA of the aluminum plate 10 is within the steel plate 20. The thickness tB shall be greater than or equal to _B. When the thickness _tA of the aluminum plate 10 is increased, the warpage caused by the difference in linear expansion coefficient between the aluminum plate 10 and the steel plate 20 increases. On the other hand, by increasing the thickness _tA of the aluminum plate 10, the rigidity of the composite member 1 increases. As a result, the warpage caused by the difference in linear expansion coefficient becomes smaller. If the thickness _tA of the aluminum plate 10 is less than the thickness _tB of the steel plate 20, the influence of the steel plate 20 having a large coefficient of linear expansion will be strong, and even if the resin layer 30 is provided, it will be difficult to use during manufacturing and use. It is sometimes impossible to suppress shape changes that occur due to heat. By making the thickness _tA of the aluminum plate 10 greater than or equal to the thickness _tB of the steel plate 20, it becomes possible to alleviate the difference in linear expansion coefficient between aluminum and iron with the resin layer 30, and it is possible to reduce the difference in linear expansion coefficient between aluminum and iron, which is caused by heat during manufacturing and use. It is possible to reliably suppress the shape change that occurs due to this, and further improve the flatness of the composite member. It is more preferable that the thickness t _A of the aluminum plate 10 is thicker than the thickness t _B of the steel plate 20 (that is, t _A >t _B ).

[ _tT : 1.50 to 5.00mm]
In the composite member 1 according to this embodiment, the overall thickness t _T of the composite member 1 is 1.50 to 5.00 mm. If the overall thickness _tT of the composite member 1 is less than 1.50 mm, it is not possible to further improve the flatness of the composite member while achieving both thermal uniformity and suppression of shape change. By setting the overall thickness t _T of the composite member 1 to 1.50 mm or more, it is possible to further improve the flatness of the composite member while achieving both thermal uniformity and suppression of shape change. The overall thickness _tT of the composite material 1 is preferably 2.00 mm or more, more preferably 2.50 mm or more, and even more preferably 3.00 mm or more. On the other hand, if the overall thickness _tT of the composite member 1 exceeds 5.00 mm, the workability required for the composite member 1 cannot be obtained. The composite member 1 is used by joining other parts with mechanical fixing means such as screws. At that time, the composite member 1 is often shallowly drawn so that its head does not protrude beyond the surface of the composite member 1. If the total thickness _tT exceeds 5.00 mm, the shallow drawing process described above becomes difficult. By setting the overall thickness _tT of the composite member 1 to 5.00 mm or less, it is possible to achieve both thermal properties and workability. The overall thickness _tT of the composite material 1 is preferably 4.50 mm or less, more preferably 4.00 mm or less.

Note that the thickness _tA of the aluminum plate 10 and the thickness _tB of the steel plate 20 are subtracted from the total thickness _tT of the composite member 1 according to the present embodiment, which is the thickness of the resin layer 30 and the thickness of the adhesive layer 40. is the sum of

[Ratio _tA / _tB : 1.10 to 3.30]
In the composite member 1 according to the present embodiment, the ratio t _A /t _B of the thickness t _A of the aluminum plate 10 to the thickness t _B of the steel plate 20 is preferably 1.10 to 3.30. By setting the ratio t _A /t _B to 1.10 to 3.30, it is possible to more reliably achieve both thermal uniformity and suppression of shape change, while further improving the flatness of the composite member. It becomes possible. The lower limit of the ratio t _A /t _B is more preferably 1.20, still more preferably 1.30, even more preferably 1.40. Further, the upper limit of the ratio t _A /t _B is more preferably 3.00, still more preferably 2.50, even more preferably 2.00, particularly preferably 1.70.

[(t _A + t _B )/t _T ≦0.65]
In the composite member 1 according to the present embodiment, the thickness t _A of the aluminum plate 10, the thickness t _B of the steel plate 20, and the total thickness t _T of the composite member 1 are (t _A + t _B )/t _T ≦0. It is preferable that the relationship of 65 is satisfied. By satisfying the relationship (t _A + t _B )/t _T ≦0.65, it is possible to more reliably achieve both thermal uniformity and suppression of shape change, while further improving the flatness of the composite member. becomes possible. The value of (t _A + t _B )/t _T is more preferably 0.60 or less, still more preferably 0.50 or less, even more preferably 0.40 or less, and particularly preferably 0.35. It is as follows. (t _A + t _B )/t Although it is not necessary to specifically set the lower limit of the value of _T , it may be 0.10, 0.15, 0.20, or 0.28.

[About the thickness measurement method]
Here, the thickness of each layer constituting the composite member 1 (for example, the thickness _tA of the aluminum plate 10, the thickness _tB of the steel plate 20, the overall thickness _tT , the thickness of the resin layer 30, etc.) can be determined by various known methods. It is possible to measure by

For example, when measuring the thickness of the aluminum plate 10 after the fact, the composite member 1 is embedded in a thermosetting resin such as an epoxy resin, and a cutting machine such as a precision cutter is used to cut the composite member 1 parallel to the thickness direction at the point to be observed. Cut the sample to obtain a cross section, and observe the obtained cross section with an optical microscope. Measure the shortest distance to the interface between the aluminum plate 10 and the resin layer 30 from multiple arbitrary positions (for example, 5 positions) on the interface between the embedded resin and the aluminum plate 10 (i.e., in the direction perpendicular to the interface). ) and average the measurements obtained. The average thickness of the aluminum plate 10 obtained in this manner can be defined as the thickness _tA of the aluminum plate 10.

Furthermore, the thicknesses of other layers of the composite member 1 according to the present embodiment can also be measured in the same manner as described above.

<About the layer structure of the steel plate 20>
2A and 2B are explanatory diagrams schematically showing an example of the configuration of the steel plate 20 according to the present embodiment.
As mentioned above, it is possible to use various steel plates and alloy steel plates as the steel plate 20 according to the present embodiment, but the steel plate 20 can be formed by applying various plating treatments to the various steel plates as described above. It is also possible to use surface-treated steel sheets that have been subjected to various surface treatments.

Here, surface treatments include various plating treatments such as galvanizing (hot-dip galvanized steel sheets, electrogalvanizing, etc.) and aluminum plating, chemical conversion treatments such as chromate treatment and non-chromate treatment, and physical treatments such as sandblasting. Examples include, but are not limited to, chemical surface roughening treatments such as surface roughening or chemical etching (which can also be considered as a design processing treatment that adds design properties). Further, alloying of plating or multiple types of surface treatments may be performed. As for the surface treatment, it is preferable that treatment is performed for the purpose of imparting at least rust prevention properties.

For example, as schematically shown in FIGS. 2A and 2B, the steel plate 20 according to the present embodiment includes a plating layer 203 located on one surface or both surfaces of the base steel sheet 201, and a plating layer 203 located on one surface or both surfaces of the base material steel sheet 201. A coating layer 205 located on the surface of 203 may be included.

Here, the plating layer 203 is representative of hot-dip galvanizing, zinc alloy plating, alloyed hot-dip galvanizing, electrogalvanizing, electrolytic Zn-Ni plating, hot-dip Zn-5% Al alloy plating, and hot-dip 55% Al-Zn alloy plating. Hot-dip Zn-Al alloy plating, typified by hot-dip Zn-1 to 12% Al-1 to 4% Mg alloy plating and hot-dip 55% Al-Zn-0.1 to 3% Mg alloy plating. - Various platings can be mentioned, such as Mg alloy plating, Ni plating, alloyed Ni plating, Al plating, tin plating, and chrome plating.

Among the above-mentioned platings, zinc-based plating containing Zn is particularly preferable as the plating layer 203 because it has excellent corrosion resistance.

Further, the coating layer 205 is, for example, a layer composed of various base paints, various additives, and the like. Although the coating layer 205 is illustrated as a single layer structure in FIGS. 2A and 2B, the coating layer 205 may have a multilayer structure composed of a plurality of layers.

The base paint that can be contained in the coating layer 205 is not particularly limited, and paints containing various known resins can be used. Examples of such resins include polyacrylic resins, polyolefin resins, polyurethane resins, epoxy resins, polyester resins, polybutyral resins, melamine resins, silicone resins, fluororesins, acrylic resins, etc. These resins can be used alone or in combination. Further, these resins can be cured with any curing agent. Such paints can be used in any form such as organic solvent-based, water-based, or powder-based.

Further, various additives that may be contained in the coating layer 205 according to the present embodiment include, for example, various extender pigments, colorants, chemical conversion agents, rust inhibitors, surface-modified metal powders and glass powders, and dispersion. Examples include various additives such as additives, leveling agents, antioxidants, antifoaming agents, viscosity modifiers, ultraviolet absorbers, waxes, aggregates, fluororesin beads, and diluting solvents. Furthermore, fluororesin beads are spherical substances made of fluororesin, and because they are made of fluororesin, they have lubricating properties, making it possible to improve the scratch resistance of paint films. . Here, when the coating layer 205 contains various extender pigments and colorants as additives, it is possible to improve the design of the steel sheet 20 and make it function as a decorative steel sheet. As a result, when the composite member 1 according to the present embodiment is used as an exterior material, it can be used as a material that exhibits excellent design properties without applying a separate coating.

The components that can be included in the coating layer 205 according to this embodiment have been described above by citing the coating composition. Normally, when these coating compositions are applied onto the plating layer 203, these components and the component composition of the formed film are usually different. In the coating layer 205, due to the reaction with the plating layer 203, the volatilization of volatile components in the coating composition, etc., the composition of the coating composition and the coating layer 205 after coating are different, and the coating layer 205 is formed. It is usually technically difficult to specify the composition of the coating layer 205. Further, it is actually technically difficult to specify the composition of such a coating layer 205 by instrumental analysis or the like. Therefore, in this embodiment, the coating layer 205 to be formed is specified by specifying the components that can be included in the coating composition.

Furthermore, in the steel plate 20 according to the present embodiment, the surface of the plating layer 203 has a pattern, and the coating layer 205 has transparency that allows the pattern to be visually recognized through the coating layer 205. It's okay. Here, examples of the pattern that the surface of the plating layer 203 has include glossy finishes such as buffing and mirror finishing, satin finishes such as hairline finishing, vibration finishing, blasting, and dull finishing. be able to.

The steel plate 20 according to the present embodiment functions as a decorative steel plate by containing various additives as described above or forming a pattern, so that the composite member 1 according to the present embodiment can be used as an exterior. When used as a material, it can be used as a material that exhibits excellent design properties without requiring a separate coating.

Here, the above-mentioned plating layer 203 can be formed by various known plating methods such as hot-dip plating and electroplating. Further, the coating layer 205 as described above is coated with the above-mentioned paint by a generally known coating method (for example, roll coating, curtain flow coating, air spray, airless spray, dipping, bar coating, brush coating, etc.). It can be formed by coating, drying and solidifying.

<About the resin layer 30>
The resin layer 30 according to this embodiment is a layer provided to alleviate the difference in linear expansion coefficient between the aluminum plate 10 and the steel plate 20. Resin generally has a coefficient of linear expansion of several to several tens of × 10 ^-5 /°C, so by interposing such a resin layer 30 between the aluminum plate 10 and the steel plate 20, By making the resin follow the shape change that may occur in the aluminum plate 10 or the steel plate 20, it becomes possible to alleviate the shape change that may occur.

The resin layer 30 may contain at least one of polyethylene resin (linear expansion coefficient: 10 to 20×10 ⁻⁵ /°C) or epoxy resin (linear expansion coefficient: 4 to 6×10 ⁻⁵ /°C). preferable. When the resin layer 30 contains at least either polyethylene resin or epoxy resin, it becomes possible to more reliably alleviate possible shape changes.

Further, the composite member 1 according to the present embodiment may be used in a device that generates heat during operation, but in order for the resin layer 30 to function more reliably even in such a heat generation environment, the resin layer 30 It is preferable that the resin contained in the resin has a glass transition point Tg in the temperature range to which the device is exposed. The device undergoes repeated temperature fluctuations from room temperature to operating temperature. If the glass transition point Tg of the resin is within this temperature range, the glass state and rubber state will be repeated every time the resin is operated. Such a change in state is accompanied by a change in the volume of the resin. Therefore, the volume of the composite member 1 will repeat expansion and contraction, and the durability of the composite material 1 may be impaired.

For example, when considering application to home appliances such as display devices such as organic EL displays, it is assumed that the product temperature fluctuates in the range of 0°C to 50°C. Therefore, the glass transition point Tg of the resin contained in the resin layer 30 is preferably 0°C or lower or 50 to 180°C, more preferably -20°C or lower or 50 to 140°C. . In particular, the glass transition point Tg of the resin is most preferably 50 to 120°C or 80 to 120°C.

Here, the glass transition point of the resin can be measured by various known methods. For example, by measuring the resin of interest using a differential scanning calorimetry (DSC), It is possible to specify.

Further, the resin contained in the resin layer 30 according to the present embodiment has a ratio E'/E'' of the dynamic storage modulus E' and the dynamic loss modulus E'' at 100°C of 0.20 to 20. .0 is preferable. Since the resin contained in the resin layer 30 has the above-mentioned viscoelastic properties, the resin can follow the shape change that may occur in the aluminum plate 10 or the steel plate 20, thereby more reliably alleviating the shape change that may occur. becomes possible. The ratio E'/E'' between the dynamic storage modulus E' and the dynamic loss modulus E'' at 100° C. is more preferably from 0.40 to 15.0.

Here, the ratio E'/E'' of the dynamic storage elastic modulus E' and the dynamic loss elastic modulus E'' as described above is the storage elastic modulus obtained by performing dynamic viscoelasticity measurement under the following conditions. It can be confirmed from E' and loss modulus E''. In other words, in such dynamic viscoelasticity measurement, a thermomechanical analysis device is used to determine storage modulus E' and loss modulus E''. Identify. At this time, the storage elastic modulus E' and the loss elastic modulus E'' are measured in a nitrogen gas stream, in compression mode, at 1 Hz, at a temperature increase of 1° C./min, in the range of 25 to 200° C.

<About the adhesive layer 40>
The adhesive layer 40 according to the present embodiment is used as necessary to further improve the adhesion between the resin layer 30 and the aluminum plate 10 or between the resin layer 30 and the steel plate 20. This is a layer provided by

The adhesive layer 40 is a layer mainly composed of components derived from adhesive. The adhesive used to form the adhesive layer 40 is not particularly limited, and examples include epoxy resin adhesives, polyester resin adhesives, urethane resin adhesives, and adhesives in which rubber or elastomer is mixed with these adhesives. A conductive agent, an adhesive imparted with conductivity, and the like can be used. Among the above, from the viewpoint of initial adhesive strength, it is preferable that the adhesive layer 40 contains an epoxy resin adhesive or a urethane resin adhesive (ie, a thermosetting adhesive).

Further, it is preferable that the adhesive resin constituting the adhesive layer 40 has the same chemical structure as the resin in the resin layer 30. Thereby, the initial adhesion between the adhesive layer 40 and the resin layer 30 can be made even more excellent, and the adhesive strength of the composite member 1 can be further increased.

For example, the adhesive resin constituting the adhesive layer 40 may have the same main skeleton as the resin in the resin layer 30. Alternatively, the adhesive resin constituting the adhesive layer 40 may have a side chain functional group common to the resin in the resin layer 30.

The adhesive layer 40 described above is formed by applying the adhesive described above to the surface of the aluminum plate 10 or the steel plate 20 using a generally known coating method (for example, roll coating, curtain flow coating, air spray, airless spray). , dipping, bar coating, brush coating, etc.), bonding it with the resin layer 30 or a resin composition that will become the resin layer 30, and then drying and solidifying it.

<About flatness of composite member 1>
The composite member 1 according to the present embodiment can maintain excellent flatness due to the presence of a specific resin layer 30 between the aluminum plate 10 and the steel plate 20 having a specific thickness, resulting in improved heat uniformity and shape change. This makes it possible to achieve both the suppression of Regarding the flatness of the composite member 1 according to this embodiment, the maximum strain is 3.0 mm or less. Here, the maximum strain is the maximum value obtained by subtracting the thickness of the composite member 1 from the strain (height of waves or warping) in any direction and position when the composite member 1 is placed on a surface plate. . However, for composite members 1 whose wave pitch exceeds 1 m, this applies to a length of 1 m at any position. The maximum strain is preferably 2.0 mm or less, more preferably 1.6 mm or less, even more preferably 1.2 mm or less, even more preferably 1.0 mm or less.

The flatness as described above is achieved by going through a straightening step carried out at a specific timing in the method for manufacturing the composite member 1 according to the present embodiment, as will be described in detail below.

<About the use of composite member 1>
The composite member 1 according to this embodiment as described above can be used in a device that generates heat during operation. The composite member 1 according to the present embodiment can more reliably suppress shape changes caused by heat generated during manufacturing and use, so it can be used for devices that generate heat during operation. You can fully demonstrate its performance.

Examples of devices that generate heat during operation include components for home appliances such as display panels such as organic EL display panels, and various batteries such as Li-ion battery cells, fuel cells, and solar cells. Examples include cells.

The composite member 1 according to the present embodiment has been described in detail above with reference to FIGS. 1A to 2B.

(About the manufacturing method of composite parts)
Next, a method for manufacturing the composite member 1 according to this embodiment will be described with reference to FIG. 3. FIG. 3 is a flowchart showing an example of the flow of the method for manufacturing the composite member 1 according to the present embodiment.

As shown in FIG. 3, the method for manufacturing the composite member 1 according to the present embodiment includes an adhesive application process (step S11), a lamination pressure bonding process (step S13), a straightening process (step S15), and a solidifying process. (Step S17). Here, the adhesive application step (step S15) is a step performed as necessary when forming the adhesive layer 40, and in the method for manufacturing the composite member 1 according to the present embodiment, the adhesive application step (Step S11) may not exist.

<Adhesive application process>
The adhesive application step (step S11) is a step of applying the above adhesive to at least one surface of the aluminum plate 10 or the steel plate 20. By providing such a coating step, the adhesive layer 40 is provided at least between the aluminum plate 10 and the resin layer 30 or between the steel plate 20 and the resin layer 30 of the composite member 1 to be manufactured. becomes possible.

The adhesive used here is as described above, and the coating method used is also as described above.

<Lamination pressure bonding process>
In the lamination and pressure bonding step (step S13), a molten resin composition is injected into the gap between the aluminum plate 10 and the steel plate 20, which are spaced apart from each other, and the aluminum plate 10 and the steel plate 20 are bonded together. This is the process of Here, since the resin composition to be injected is as described above, detailed explanation will be omitted below. In addition, when using a steel plate on which the plating layer 203 and the coating layer 205 are formed as the steel plate 20, the plating layer 203 and the coating layer 205 are applied to the base steel plate 201 prior to the lamination pressure bonding process. Form it. A known method may be used as a method for crimping the laminate. For example, a method may be used in which a resin composition in a molten state is injected while the gap between the aluminum plate 10 and the steel plate 20 is maintained at a predetermined distance. Alternatively, a method may be used in which a resin composition in a molten state is previously applied to the surface of the aluminum plate 10 or the steel plate 20, and then the other metal plate is crimped.

<Correcting process>
As described above, the resin composition in a molten state is injected into the gap between the aluminum plate 10 and the steel plate 20, and the aluminum plate 10 and the steel plate 20 are pressure-bonded. Due to the amount of heat generated and the difference in linear expansion coefficient between the aluminum plate 10 and the steel plate 20, shape changes such as warping occur in the composite member 1 during the cooling process and the like. Therefore, in the straightening step (step S15) according to the present embodiment, when the surface temperature of the composite member 1 is within the range of not less than the glass transition point of the resin contained in the resin composition and not more than 180°C, the composite member 1 Correct the shape of. However, if the glass transition point of the resin contained in the resin composition is 0° C. or lower, the shape of the composite member 1 shall be corrected when the temperature is within the range of room temperature or higher and 180° C. or lower.

Here, if the straightening process is carried out at a timing when the surface temperature of the composite member 1 exceeds 180°C, the heat possessed by the resin composition is too high, and the aluminum plate 10 is heated during the cooling process after straightening. Since the steel plate 20 is further warped due to strain caused by the difference in linear expansion coefficient, there is a possibility that the shape will change again after the straightening process, which is not preferable. On the other hand, if the straightening process is performed at a timing when the surface temperature of the composite member 1 is lower than the glass transition point Tg of the resin, the internal stress of the resin in a glass state cannot be sufficiently relaxed by straightening, and the composite member manufactured is It is not possible to maintain a flatness of 1. Therefore, the surface temperature of the composite member 1 needs to be equal to or higher than the glass transition point Tg of the resin. In addition, straightening at a lower temperature is preferable in order to reduce strain caused by the difference in linear expansion coefficients between the aluminum plate 10 and the steel plate 20 during the cooling process after straightening. Therefore, in order to improve the flatness of the composite member 1 and prevent the shape from changing during use of the equipment, a resin with a glass transition point Tg of 50 to 120°C is used, and the surface temperature of the composite member 1 is adjusted to 120°C to 120°C. It is more preferable to perform the correction at a timing within the range of 140°C.

As a method for correcting shape changes such as warpage occurring in the aluminum plate 10 or the steel plate 20, it is preferable to use a roller leveler with a working degree of 5 or more. Here, the maximum value of the curvature given between each straightening roller constituting the roller leveler is set to e (assuming that the material to be straightened is flat), and the elastic limit curvature of the material to be straightened is set to ey. Sometimes, the maximum value e of the curvature is divided by the elastic limit curvature ey to make it dimensionless (e/ey), and the degree of processing by the roller leveler is defined as the degree of processing by the roller leveler. By using a roller leveler to correct the deformation of the composite member 1, which has undergone deformation due to heat during manufacturing, as described above, the composite member 1 can have better flatness when manufactured. It becomes possible to realize this.

Further, in the above-mentioned straightening process, processing conditions that can remove residual stress during cutting plate processing are preferable. That is, it is preferable to perform the cutting process on the same manufacturing line immediately after the above-described straightening. If straightening is performed after processing the cut plate, sufficient corrective strain cannot be applied to the tip or tail end during straightening, and there is a concern that the flatness of the tip or tail end may deteriorate, which is not preferable. Further, if the material is wound into a coil after straightening, the shape will be curved by winding, so it is not possible to wind the material into a coil after straightening.

<Solidification process>
The solidifying step (step S17) is a step of solidifying the resin composition located between the aluminum plate 10 and the steel plate 20 to form the resin layer 30. Here, solidifying the resin composition means cooling the temperature of the resin composition to below its glass transition point Tg. Here, when the glass transition point Tg of the resin of interest is less than 0°C, the resin composition is cooled to less than the glass transition point Tg, which is less than 0°C. As a result, a composite member 1 having a laminated structure of aluminum plate 10/resin layer 30/steel plate 20 is manufactured. Further, when an adhesive is applied to the surface of the aluminum plate 10 or the steel plate 20, the adhesive is solidified through this solidification process, and the adhesive layer 40 is formed. Note that it is troublesome to cool the composite member 1 to less than 0°C, so it is preferable to use a resin composition having a glass transition point Tg of 50°C or higher.

Here, when forming the resin layer 30 by cooling and solidifying the molten resin, it is preferable to control the cooling rate. If the cooling rate is high, a temperature distribution will occur in the resin layer 30, causing distortion. That is, the cooling rate in the step of solidifying the molten resin is preferably lower, and specifically, is preferably 5° C./min or less, for example.

In addition, steps such as placing a weight on the surface of at least one of the aluminum plate 10 or the steel plate 20 (applying a load) after the lamination press-bonding process, or carrying out a straightening process and a solidification process while pressing after the lamination press-bonding process. I can also think of it. However, as a result of the inventors' studies on these steps, it was not possible to achieve the desired flatness using these steps.

The method for manufacturing the composite member 1 according to the present embodiment has been described above with reference to FIG. 3.

(About equipment in which composite member 1 is used)
By using the composite member 1 according to this embodiment as described above and a device that generates heat during operation, it is possible to realize the following equipment.
That is, the device according to the present embodiment is located in a state where at least a portion thereof is in contact with the composite member 1 as described above and the surface of the aluminum plate 10 side of the composite member 1, and generates heat during operation. and a device.

Examples of devices that generate heat during operation include components for home appliances such as display panels such as organic EL display panels, and various devices such as Li-ion battery cells, fuel cells, and solar cells. Examples include battery cells. For example, by combining an organic EL display panel and the composite member 1, a display device called an organic EL display can be realized. Further, by combining various battery cells such as Li-ion battery cells, fuel cells, and solar cells with the composite member 1, various battery devices can be realized.

Hereinafter, with reference to FIG. 4, an explanation will be given by taking as an example an organic EL display realized by combining the composite member 1 and an organic EL display panel.

As schematically shown in FIG. 4, an organic EL display 500 as an example of a display device includes a composite member 1 according to the present embodiment and an organic EL display panel 3, and further includes an organic EL display panel 3. It may include an electronic board 5 for controlling the drive of the display panel 3.

Here, as shown in FIG. 4, the organic EL display panel 3 is provided on at least a part of the surface of the composite member 1 on the aluminum plate 10 side, and the electronic board 5 is provided on the surface of the composite member 1 on the steel plate 20 side. provided in at least a portion of the

Here, by providing the organic EL display panel 3 on the aluminum plate 10 side of the composite member 1, it becomes possible to quickly conduct heat generated in the organic EL display panel 3 due to aluminum having high thermal conductivity. . That is, since the composite member 1 itself according to the present embodiment has sufficient thermal conductivity, it is possible to reliably ensure thermal uniformity within the display surface of the organic EL display panel 3. In addition, since the composite member 1 according to the present embodiment has excellent flatness, it becomes possible to join the organic EL display panel 3 to the composite member 1 in a more desirable state, and the organic EL display panel 3 It becomes possible to improve the adhesion between the composite member 1 and the composite member 1, and even heat conduction becomes possible.

Furthermore, by using the composite member 1 according to the present embodiment, it is possible to prevent the composite member 1 from changing its shape due to heat generated as the organic EL display panel 3 operates. Even if heat is generated in the organic EL display panel 3, the generated heat can be evenly and reliably conducted to the composite member 1 side, and a favorable operating state of the organic EL display panel 3 can be maintained.

The apparatus in which the composite member 1 according to the present embodiment is used has been described in detail above with reference to FIG. 4.

Hereinafter, the composite member, the method for manufacturing the composite member, and the equipment according to the present invention will be specifically explained while showing Examples and Comparative Examples. Note that the examples shown below are only examples of the composite member, the method for manufacturing a composite member, and the equipment according to the present invention, and the composite member, the method for manufacturing a composite member, and the equipment according to the present invention are limited to the following examples. It's not a thing.

In the example shown below, a commercially available aluminum plate having a desired thickness is prepared as the aluminum plate 10, and the following three types of steel plates (manufactured by Nippon Steel Corporation) having the desired thickness are used as the steel plate 20. Got ready.

ZL-HL: Electric Zn-Ni alloy plated steel plate with hairline processing. A clear coating with a thickness of 6 μm has been formed on the surface of the steel plate.
GI-PCM: hot-dip galvanized steel sheet. A coating layer with a thickness of 20 μm (primer coating: 5 μm + top coating: 15 μm) has been formed on the surface of the steel plate.
CR-painting: cold rolled steel plate. The surface of the steel plate was subjected to chemical conversion treatment using zinc phosphate, and then powder coating was applied to a thickness of 50 μm.

As a resin composition for forming the resin layer 30, commercially available resins shown below were prepared. The glass transition point Tg and viscoelastic properties (dynamic storage modulus E', dynamic loss modulus E'') of the resin used were measured by the method described above.

PE: Polyethylene resin (Novatec HD HF560 manufactured by Japan Polyethylene Co., Ltd.)
EP: Epoxy resin (Mitsubishi Chemical Corporation 1009)
PES: Polyester resin (SI-173 manufactured by Toyobo Co., Ltd.)
UR: Urethane resin (PANDEX T-5765D manufactured by DIC Covestro Polymer Co., Ltd.)

Further, when forming the adhesive layer 40, a commercially available adhesive (TB1655 manufactured by Three Bond Co., Ltd.) containing an epoxy resin as a main component was used.

An adhesive was applied to the surfaces of the aluminum plate 10 and steel plate 20 as required, and then thermocouples were installed to measure the surface temperatures of the aluminum plate 10 and steel plate 20. Thereafter, the aluminum plate 10 and the steel plate 20 are placed apart from each other so that the resin layer 30 has a desired thickness, and a molten resin composition is injected into the gap between the aluminum plate 10 and the steel plate 20. , composite member 1 was manufactured.

At this time, the shape of the composite member 1 was corrected using a roller leveler at the timing when the surface temperature of the composite member 1 reached a desired temperature. At this time, the degree of processing by the roller leveler was 5 in all cases. After such correction, the resin composition was solidified by cooling to a temperature below the glass transition point Tg at a cooling rate of 5° C./min to produce a composite member. The shape of the composite member 1 was a rectangle, and the width-to-height ratio (width:height) was 16:9. The diagonal length of the composite member 1 was 60 inches (1524 mm).

The obtained composite member was evaluated from the viewpoints of maximum strain, thermal uniformity, steepness, shape change during use, press workability, and color unevenness, and the results are summarized in Table 1 below. Details of the evaluation contents are as follows.

<Maximum strain>
The maximum strain in any direction was measured for the obtained composite member.

<Heat uniformity>
A sample of 70 mm x 180 mm was prepared from the obtained composite member. A rubber heater was attached to one end of the aluminum plate 10 side, and the output of the heater was kept constant at 3.4 W for 30 minutes, and the temperature was measured from the steel plate 20 side every 50 mm from the end. The temperature difference ΔT between the temperature of the heater and the temperature at a position 150 mm away from the end was calculated. Based on the obtained temperature difference ΔT, evaluation was performed according to the following criteria. A score of S to B was considered passing.
S: ΔT 15°C or less A: ΔT more than 15°C and less than 25°C B: ΔT more than 25°C and less than 35°C C: ΔT more than 35°C

<Steepness>
Regarding the obtained composite member, the maximum strain was measured on a surface plate in the same manner as above, and the pitch, which is the interval at which strain appears, was measured. From the obtained maximum strain and pitch, steepness (%) = (maximum strain ÷ pitch) x 100 was calculated, and based on the obtained steepness, evaluation was performed using the following criteria. A score of S to B was considered passing.
S: Steepness 0.5% or less A: Steepness more than 0.5% but not more than 1.0% B: Steepness more than 1.0% and not more than 2.0% C: Steepness more than 2.0%

<Shape change during use>
A test specimen as shown in FIG. 5 was prepared to simulate the case where the obtained composite member was joined to an organic EL display panel, and evaluated as follows.

The obtained composite member was cut into a size of 380 mm in width and 285 mm in height. After that, the steel plate 20 side of the composite member was placed vertically overlapping a hot-dip galvanized steel plate with a thickness of 0.8 mm adjusted to the same dimensions (see the upper diagram in Figure 5), and the four sides of the composite member was sandwiched between commercially available angles (see the bottom diagram in Figure 5). Then, the composite member and the hot-dip galvanized steel plate were fixed using screws as means for fixing the composite member and the hot-dip galvanized steel plate. A halogen heater was placed on the aluminum plate 10 side of the composite member in a non-contact manner, and the aluminum plate 10 was heated. The maximum displacement when the surface temperature of the aluminum plate 10 reached 50° C. was measured using a laser displacement meter. Based on the obtained maximum displacement, evaluation was performed according to the following criteria. A score of S to B was considered passing.
S: Maximum displacement 0.5 mm or less A: Maximum displacement more than 0.5 mm and less than 1.0 mm B: Maximum displacement more than 1.0 mm and less than 1.8 mm C: Maximum displacement more than 1.8 mm

<Press workability>
The obtained composite member was extruded using an Erichsen tester (based on JIS Z 2247) until the test piece broke so that the aluminum plate 10 side became concave. The maximum extrusion height D (unit: mm) at which cracking occurred was determined. Based on the obtained height D, evaluation was performed according to the following criteria. A score of S to B was considered passing.
S: Height D 7 mm or more A: Height D 5 mm or more and less than 7 mm B: Height D 3 mm or more and less than 5 mm C: Height D less than 3 mm

<Uneven color>
The aluminum plate 10 side of the obtained composite member 1 was joined to an organic EL display panel manufactured by Sony Corporation. After setting half of the display screen of the organic EL display to red and the other half to black, the organic EL display was displayed continuously for one hour. After that, the logo of Nippon Steel Corporation (the logo of Nippon Steel Corporation is based on blue) was displayed in the center of the display screen, and 10 people visually judged how the blue color appeared. . Based on the number of people who felt a difference in color, evaluation was performed using the following criteria. A score of S to B was considered passing. In addition, No. in Table 1 below. In No. 10 and No. 23, the evaluation result of "-" means that the shape when processed was poor and it could not be incorporated into an organic EL display panel, so it could not be evaluated.
S: 0 people A: 1, 2, or 3 people B: 4, 5, or 6 people C: 7 or more people

As is clear from Table 1 above, the composite members corresponding to the examples of the present invention have excellent heat uniformity and press workability, and have suppressed shape changes during manufacturing and use. It can be seen that the composite members corresponding to the comparative examples failed in either thermal uniformity, press workability, or shape change during manufacture or use.

Although preferred embodiments of the present invention have been described above in detail with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that a person with ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea stated in the claims. It is understood that these also naturally fall within the technical scope of the present invention.

1 Composite member 3 Organic EL display panel 5 Electronic board 10 Aluminum plate 20 Steel plate 30 Resin layer 40 Adhesive layer 201 Base steel plate 203 Plating layer 205 Coating layer 500 Organic EL display

Claims (11)

aluminum plate and
steel plate and
a resin layer interposed between the aluminum plate and the steel plate;
A composite member used in equipment that includes a device that generates heat during operation,
The thickness _tA of the aluminum plate is 0.20 to 1.60 mm,
The thickness _tB of the steel plate is 0.15 to 1.20 mm,
The overall thickness _tT of the composite member is 1.50 to 5.00 mm,
The thickness _tA of the aluminum plate is greater than or equal to the thickness _tB of the steel plate ,
A composite member whose steepness calculated from the following formula is 2.0% or less .
Steepness (%) = (maximum strain of composite member/pitch where strain appears) x 100 The composite member according to claim 1, wherein the flatness of the composite member is such that the maximum strain in any direction is 3.0 mm or less. The composite member according to claim 1 or 2, wherein the flatness of the composite member is such that the maximum strain in any direction is 2.0 mm or less. The composite member according to any one of claims 1 to 3, wherein a ratio t _A /t _{B of the thickness t A of} the aluminum plate to the thickness t _B of the steel plate is 1.10 to 3.30. 1 . The thickness t _A of the aluminum plate, the thickness t _B of the steel plate, and the total thickness t _T of the composite member satisfy the following relationship: (t _A +t _B )/t _T ≦0.65. The composite member according to any one of items 1 to 4. The composite member according to any one of claims 1 to 5, wherein the resin layer contains polyethylene resin or epoxy resin. The composite member according to any one of claims 1 to 6, wherein the resin contained in the resin layer has a glass transition point Tg of 0°C or lower, or 50 to 180°C. Claim 1, wherein the ratio E'/E'' of the dynamic storage elastic modulus E' and the dynamic loss elastic modulus E'' at 100° C. of the resin contained in the resin layer is 0.20 to 20.0. The composite member according to any one of items 7 to 7. The composite member according to any one of claims 1 to 8, further comprising an adhesive layer between the resin layer and the aluminum plate, or between the resin layer and the steel plate. . The composite member according to any one of claims 1 to 9, wherein the steel plate has a plating layer located on at least one surface and a coating layer located on the plating layer. The composite member according to any one of claims 1 to 10, wherein the surface of the aluminum plate is used so as to be in contact with at least a portion of the heat generating device.

Images