TWI867489B - Aluminum alloy raised floor - Google Patents

Abstract

Provided is an aluminum alloy raised floor comprising an aluminum alloy die-casting, wherein the aluminum alloy die-casting comprises: 7 to 11 wt % of silicon, 3 to 9 wt % of magnesium, 1 to 3 wt % of copper, and a balance of aluminum, wherein the aluminum alloy die-casting has a magnesium silicide (Mg ₂Si) phase. The aluminum alloy raised floor of the present disclosure exhibits better yield strength and has excellent bearing capacity.

Description

Aluminum alloy raised floor

The present disclosure relates to an aluminum alloy elevated floor, and more particularly to an aluminum alloy elevated floor comprising an aluminum alloy having a specific composition.

The advantage of the raised floor is that there is a certain amount of suspended space between the raised floor where the equipment is placed and the ground. In addition to being able to lay pipelines and facilitate construction by workers, exhaust equipment can also be installed to continuously remove the generated dust and prevent it from falling on the surface of products or parts. Currently, in various high-precision semiconductor factories, in order to facilitate the air quality of the clean environment, most of them are equipped with multiple micro-perforated raised floors to maintain the required environmental cleanliness to ensure that they meet the specifications of the clean room.

However, it is known that the structural strength of the elevated floor is often insufficient, and the limited load-bearing capacity leads to restrictions on the installation of equipment. For example, when heavier equipment used in the semiconductor process is placed on the elevated floor, the elevated floor is prone to dents and cracks.

On the other hand, raised floors are often too heavy, which not only wastes materials but also increases manufacturing costs.

Therefore, the industry expects an elevated floor with excellent load-bearing capacity and light material.

In view of the above deficiencies in the prior art, the present disclosure provides an aluminum alloy elevated floor, comprising an aluminum alloy die-casting, wherein the aluminum alloy die-casting comprises: 7 to 11 wt % silicon; 3 to 9 wt % magnesium; 1 to 3 wt % copper; and the remainder aluminum, wherein the aluminum alloy die-casting has a magnesium silicide (Mg ₂ Si) phase.

In at least one specific embodiment, the aluminum alloy elevated floor disclosed herein is formed with through holes to serve as a honeycomb panel, a grid panel or a window floor.

In at least one specific embodiment, the aluminum alloy elevated floor disclosed herein is surface treated so that the surface of the aluminum alloy die-casting is formed with a surface treatment layer selected from the group consisting of epoxy resin coating, nickel-chromium coating, powder coating, and anodizing treatment.

In at least one embodiment, the aluminum alloy die-casting comprises 7.5 to 9.5 weight percent silicon. In at least one embodiment, the aluminum alloy die-casting comprises 3.5 to 6.5 weight percent magnesium. In at least one embodiment, the aluminum alloy die-casting comprises 3.5 to 5.5 weight percent magnesium or 4 to 6 weight percent magnesium. In at least one embodiment, the aluminum alloy die-casting comprises 1.5 to 2.5 weight percent copper.

In at least one specific embodiment, the aluminum alloy die-casting is an aluminum alloy die-casting of modified ADC12. In at least one specific embodiment, the aluminum alloy die-casting is made by die-casting ADC5 and ADC14.

In at least one specific embodiment, the density of the aluminum alloy die-casting is 2.6 g/cm ³ or more. In at least one specific embodiment, the tensile strength of the aluminum alloy die-casting is 190 MPa or more. In at least one specific embodiment, the yield strength of the aluminum alloy die-casting is 200 MPa or more.

In at least one specific embodiment, the aluminum alloy die-casting part is subjected to precipitation hardening treatment, wherein the precipitation hardening treatment includes solution treatment, annealing treatment and aging treatment.

In at least one specific embodiment, the solution treatment is to heat the aluminum alloy die-casting to 450 to 550°C and maintain the temperature for 1.5 to 2 hours.

In at least one specific embodiment, the aging treatment is an artificial aging treatment.

In at least one specific embodiment, the artificial aging treatment is performed at 500°C for 120 minutes.

The aluminum alloy elevated floor disclosed herein is lightweight and can provide high load-bearing capacity. It is easy to assemble, labor-saving, energy-saving, and can be used in factories that need to install heavy-duty machinery and equipment.

The following is a specific embodiment to illustrate the implementation of the present disclosure. A person with ordinary knowledge in the technical field to which the present disclosure belongs can easily understand the spirit, advantages and effects of the present disclosure according to the content contained in this article. However, the specific embodiments contained in this article are not used to limit the present disclosure. The present disclosure can also be implemented or applied through other different implementation methods. The details contained in this article can also be given different changes or modifications according to different viewpoints and applications without departing from the spirit of the present disclosure.

The proportions, structures, sizes and other features shown in the figures attached hereto are only used to match the contents disclosed hereto, so that those with ordinary knowledge in the technical field to which the present disclosure belongs can read and understand the present disclosure, and are not used to limit the scope of implementation of the present disclosure. Therefore, any changes in the proportion relationship, modifications in the structure, or adjustments in the size should fall within the scope of the technical contents disclosed hereto without affecting the purpose and effects that can be achieved by the present disclosure.

When the term “includes,” “comprising,” or “has” specific elements herein is used, unless otherwise stated, other elements, components, structures, regions, parts, devices, systems, steps, or connections may be included, rather than excluding such other elements.

Unless expressly stated otherwise herein, the singular forms "a", "an" and "the" herein include plural forms as well, and "or" and "and/or" herein may be used interchangeably.

The terms "above" and "below" described herein are only used to facilitate the explanation of specific embodiments of the present disclosure, and are not used to limit the scope of the present disclosure. Adjustment, exchange and change of their relative positions and relationships should be regarded as the scope of the present disclosure as long as the technical content of the present disclosure is not substantially changed.

Any numerical value within the numerical range described herein is included herein, and the numerical range described herein is inclusive and combinable, and any numerical value falling within the numerical range described herein can be used as a maximum or minimum value to derive a sub-range. For example, the numerical range of "3 to 9% by weight of magnesium" means that the numerical values of 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, and 9% by weight within the range are included in the range referred to herein, and such numerical values can derive sub-ranges, for example, 3.5% to 9%, 3% to 8.5%, 3.5% to 8.5%, and the like.

The aluminum alloy elevated floor disclosed herein includes an aluminum alloy die-casting part, which can be formed by a general die-casting process or a vacuum die-casting process.

The aluminum alloy elevated floor including the aluminum alloy die-casting can be in various shapes, such as triangle, rectangle, pentagon, hexagon, etc. The aluminum alloy elevated floors of various shapes can be placed/embedded in a frame matching it, and the frame is supported by a support frame so that there is a specific distance between the frame and the actual ground, and the specific distance can be controlled by the support frame. Each corner of the frame is a support point, one end of the support frame is connected to the support point, and the other end is connected to the actual ground, and the support frame and the actual ground and the aluminum alloy elevated floor are perpendicular to each other, thereby achieving stable support. In a specific embodiment, the aluminum alloy elevated floor is rectangular and is placed/embedded in a rectangular frame. In another specific embodiment, the aluminum alloy elevated floor and the frame are both square.

In a specific embodiment, the aluminum alloy elevated floor is formed with through holes, and the through holes may be plural, so that air can circulate and promote air cleanliness. In a specific embodiment, the aluminum alloy elevated floor is formed with plural through holes, and the number, aperture and arrangement of the through holes affect the ventilation rate, and the present disclosure can obtain an aluminum alloy elevated floor with a ventilation rate of 17% to 50%. In a specific embodiment, the aluminum alloy elevated floor disclosed in the present disclosure is a honeycomb board, such as a honeycomb board with a ventilation rate of 17% and a honeycomb board with a ventilation rate of 25%; in a specific embodiment, the aluminum alloy elevated floor disclosed in the present disclosure is a grille board, such as a grille board with a ventilation rate of 50%. The aluminum alloy elevated floor may also not be formed with holes, and is a blind plate, which can be used in places without ventilation requirements. On the other hand, in response to the need for visualization under the floor, the size of the through hole can be increased, and the remaining aluminum alloy elevated floor portion can be used as a structure similar to a window frame, with a transparent window sheet placed on the through hole or embedded in the through hole, making the aluminum alloy elevated floor a window floor.

In a specific embodiment, the aluminum alloy elevated floor disclosed herein can be surface treated to enhance rust resistance, friction resistance, scratch resistance, corrosion resistance, acid and alkali corrosion resistance, and anti-slip properties. In a specific embodiment, the surface of the aluminum alloy die-casting is surface treated to form a surface treatment layer selected from the group consisting of at least one of epoxy coating, nickel-chromium coating, powder coating, and anodizing.

In the present disclosure, the aluminum alloy elevated floor includes an aluminum alloy die-casting having a specific chemical element composition, which can improve the yield strength and load-bearing capacity, thereby facilitating the application of the aluminum alloy elevated floor. Specifically, the aluminum alloy die-casting includes: 7 to 11 weight % of silicon, 3 to 9 weight % of magnesium, 1 to 3 weight % of copper, and the remainder of aluminum, wherein the aluminum alloy die-casting also has a magnesium silicide (Mg ₂ Si) phase.

The aluminum alloy die-casting part includes 7 to 11 wt % silicon, such as but not limited to 7 wt %, 7.5 wt %, 8 wt %, 8.26 wt %, 8.35 wt %, 8.5 wt %, 8.53 wt %, 9 wt %, 9.5 wt %, 9.35 wt %, 9.65 wt %, 9.68 wt %, 10 wt %, 10.25 wt %, 10.26 wt %, 10.28 wt %, 10.5 wt %, or 11 wt %, etc. In other specific embodiments, the aluminum alloy die-casting part may include 7.5 to 10.5 wt % silicon, 7.5 to 9.5 wt % silicon, or 7.5 to 9 wt % silicon.

The aluminum alloy die-casting part includes 3 to 9 wt % of magnesium, such as but not limited to 3 wt %, 3.11 wt %, 3.5 wt %, 3.6 wt %, 4 wt %, 4.5 wt %, 5 wt %, 5.17 wt %, 5.5 wt %, 5.73 wt %, 6 wt %, 6.5 wt %, 7 wt %, 7.5 wt %, 8 wt %, 8.5 wt % or 9 wt %, etc. In other specific embodiments, the aluminum alloy die-casting part may include 3 to 8 wt % of magnesium, 3 to 7 wt % of magnesium, 3.5 to 6.5 wt % of magnesium, 4 to 6.5 wt % of magnesium or 4 to 6 wt % of magnesium.

The aluminum alloy die-casting part includes 1 to 3 weight % copper, such as but not limited to 1 weight %, 1.25 weight %, 1.5 weight %, 1.75 weight %, 1.85 weight %, 1.86 weight %, 2 weight %, 2.01 weight %, 2.25 weight %, 2.26 weight %, 2.29 weight %, 2.43 weight %, 2.4 weight %, 2.44 weight %, 2.5 weight %, 2.55 weight %, 2.75 weight %, 2.98 weight % or 3 weight %, etc. In other specific embodiments, the aluminum alloy die-casting part may include 1 to 2.75 weight % copper, 1.25 to 2.75 weight % copper, 1 to 2.5 weight % copper or 1.5 to 2.5 weight % copper.

Among the various elements of aluminum alloy die-castings, silicon can be mainly used to improve fluidity, improve the thermal expansion, wear resistance and corrosion resistance of castings, etc. However, crystallized silicon easily forms hard spots, which makes the cutting processability worse. When the silicon content is low (for example, 0.7%), the ductility of the aluminum alloy is good; when the silicon content is high (for example, 7%), the ductility becomes low. In the present disclosure, silicon is added to the aluminum alloy to improve the tensile strength and yield strength of the aluminum alloy. Magnesium can make the weldability of the aluminum alloy good, and it also provides the aluminum alloy with excellent corrosion resistance, but the ductility of the aluminum alloy containing magnesium is significantly deteriorated, the solidification shrinkage ratio is large, and it is easy to have hot brittleness. When silicon and magnesium are present in an aluminum alloy, Mg ₂ Si phase can be precipitated, which can increase the yield strength and tensile strength of the aluminum alloy. However, on the other hand, the ductility is reduced. Therefore, the element composition of the aluminum alloy must be adjusted in consideration of the requirements of various properties.

Copper in aluminum alloy can be used to enhance the strength and machinability of castings, especially it gives aluminum alloys a better solid solution strengthening effect. For example, _CuAl2 precipitated by aging can bring obvious strengthening effect to aluminum alloys; however, copper will reduce the corrosion resistance of aluminum alloys. In the present disclosure, the aluminum alloy contains a small amount of copper to enhance the strength and facilitate further improving the strength of castings when a solid solution strengthening process is required.

To achieve the above-mentioned element composition, appropriate amounts of various elements may be added to the aluminum soup. In a specific embodiment, the aluminum soup is ADC12, and an aluminum alloy die-casting part of modified ADC12 is obtained by adding appropriate amounts of various elements, such as but not limited to adding pure magnesium blocks to the ADC12 aluminum soup. In another specific embodiment, ADC5 and ADC14 may also be mixed to obtain an aluminum alloy die-casting part having the above-mentioned element composition.

The aluminum alloy die-casting part disclosed herein has a density of 2.6 g/cm ³ or more, 2.65 g/cm ³ or more, or 2.7 g/cm ³ or more, such as but not limited to 2.6 g/cm ³ , 2.62 g/cm ³ , 2.63 g/cm ³ , 2.65 g/cm ³ , 2.67 g/cm ³ , 2.68 g/cm ³ , 2.7 g/cm ³ , 2.71 g/cm ³ , 2.72 g/cm ³ , 2.73 g/cm ³ , or 2.74 g/cm ^3. Moreover, the aluminum alloy die-casting part disclosed herein has a low porosity, which may be less than 10%, less than 8%, or less than 5%, such as but not limited to a porosity of 10%, 9%, 8%, 7%, 6%, 5%, 4%, or 3%. The porosity can be controlled by various conditions and parameters in the die-casting process, for example, the temperature of the aluminum bath, the temperature of the mold, the improvement of the degassing device or the filling speed.

The aluminum alloy die-casting disclosed herein has a yield strength of 200 MPa or more, 205 MPa or more, or 230 MPa or more, such as but not limited to 200 MPa, 205 MPa, 209 MPa, 210 MPa, 215 MPa, 220 MPa, 225 MPa, 230 MPa, or 233 MPa. The yield strength here is the data obtained without precipitation hardening treatment. If the aluminum alloy die-casting is further subjected to precipitation hardening treatment, the yield strength can be further increased, such as 230 MPa or more, 240 MPa or more, or 250 MPa or more.

The aluminum alloy die-casting disclosed herein has a tensile strength of 180 MPa or more, 190 MPa or more, or 200 MPa or more, such as but not limited to 180 MPa, 185 MPa, 188 MPa, 190 MPa, 191 MPa, 192 MPa, or 209 MPa. The aluminum alloy die-casting disclosed herein has a Brinell hardness of 135 HB or more, or 140 HB or more, such as but not limited to 135 HB, 136 HB, 137 HB, 138 HB, 138.1 HB, 139 HB, 140 HB, 141 HB, 142 HB, 143 HB, 144 HB, or 144.6 HB.

The precipitation hardening treatment includes solution treatment, annealing treatment and aging treatment. Solution treatment is a heat treatment procedure in which the aluminum alloy is heated to a high temperature single-phase region and then maintained at the temperature for a period of time to allow the excess phase to fully dissolve into the solid solution to obtain a supersaturated solid solution. Annealing treatment is a heat treatment procedure in which the aluminum soup is rapidly cooled, which generally enhances the strength and hardness of the aluminum alloy. The influencing factors include the rate of rapid cooling. Aging treatment refers to a heat treatment procedure in which the aluminum alloy is placed for a period of time after solution treatment, cold plastic deformation, casting, forging and other procedures, and its performance, shape and size change over time. It is divided into artificial aging and natural aging. The difference is that artificial aging is placed in a specific temperature environment while natural aging is placed in a room temperature environment.

In the present disclosure, the aluminum alloy die-casting may be subjected to precipitation hardening treatment, which includes a solution treatment process of heating the aluminum alloy die-casting to 450°C to 550°C and holding the temperature for 1.5 to 2 hours, such as 500°C for 2 hours, 450°C for 1.5 hours, or 450°C for 2 hours; and an aging treatment of the aluminum alloy die-casting after solution treatment and annealing treatment for 1 to 24 hours, such as natural aging or artificial aging. When artificial aging is used, the temperature may be 400°C to 600°C, such as 500°C for 120 minutes.

The present disclosure will be described in further detail with reference to the following embodiments, however, these embodiments are by no means intended to limit the scope of the present disclosure.

Embodiment 1

As shown in Table 1 below, pure magnesium blocks of 0.5 wt%, 1 wt%, 3 wt%, and 5 wt% are added to the molten soup formed by melting JIS standard ADC12. The magnesium blocks are stirred continuously while melting to be fully mixed, and then aluminum alloy die-cast parts are made. The contents of magnesium, silicon, and copper in the aluminum alloy die-cast parts are listed in Table 2, and the aluminum alloy die-cast parts are subjected to the following metallographic and density tests. In addition to stipulating the contents of magnesium, silicon, and copper, JIS standard ADC12 also limits the upper limits of the contents of titanium, manganese, iron, nickel, zinc, lead, and tin. However, these elements only exist in trace amounts, so they are not discussed in this disclosure and the embodiments.

Table 1 Sample preparation Sample number ADC12 (wt%) Magnesium block (wt%) S0 100 0 S1 99.5 0.5 S2 99 1 S3 97 3 S4 95 5

Table 2 Contents of magnesium, silicon and copper in aluminum alloy die-castings Sample Mg Si Cu Al JIS standard ADC12 ≤0.3 9.6-12.0 1.5-3.5 Balance S1 0.54 9.65 1.85 85.62 S2 1.13 9.35 2.44 83.65 S3 3.11 10.26 2.55 80.84 S4 5.17 8.53 2.29 81.17

Metallographic structure test

Samples were taken from the aluminum alloy die-castings of the embodiment, and rough grinding, fine grinding, polishing, corrosion and other steps were performed in sequence, and the metallographic structure of the aluminum alloy die-castings was observed by scanning electron microscope. Figures 1, 3, 5, 7 and 9 are electron microscope images of S0, S1, S2, S3 and S4 aluminum alloy die-castings, respectively, and Figures 2, 4, 6, 8 and 10 are electron microscope images of S0, S1, S2, S3 and S4 aluminum alloy die-castings after further precipitation hardening treatment, respectively, wherein the precipitation hardening treatment is solution treatment at 500°C for 2 hours, annealing treatment and natural aging treatment for 24 hours.

Figures 1, 3, 5, 7 and 9 show that the die-cast parts of S1, S2, S3 and S4 aluminum alloys have α aluminum precipitation (white part) and aluminum eutectic phase (dark part). Comparing these results with Figures 2, 4, 6, 8 and 10, it can be found that the magnesium element or silicon element in the die-cast parts of S1, S2, S3 and S4 aluminum alloys has been dissolved into α aluminum and refined grains are obtained.

Density test

The aluminum alloy die-casting embodiment without precipitation hardening treatment was prepared into 4 mm and 6 mm thick test pieces suitable for universal testing machine, 3 pieces each. The total length of the test piece is 200 mm, the dimensions of the two shoulders are 51 mm long and 20 mm wide, and the dimensions of the central part are 80 mm long and 13.5 mm wide. The density of each test piece was tested with an electronic precision balance (model: Precisa ES 2220M, Quanhua Precision Co., Ltd.), and the average value was taken. The results are shown in Table 3 below.

Table 3 - Density Specimen thickness 4 mm 6 mm S0 2.72 g/cm ³ 2.72 g/cm ³ S1 2.74 g/cm ³ 2.74 g/cm ³ S2 2.74 g/cm ³ 2.73 g/cm ³ S3 2.72 g/cm ³ 2.71 g/cm ³ S4 2.70 g/cm ³ 2.67 g/cm ³

Mechanical properties test

The aluminum alloy die-casting parts that have been precipitation hardened were prepared into 4 mm and 6 mm thick test pieces suitable for universal testing machines, 3 pieces each. The test piece size is the same as the test piece for density test. The tensile strength of the aluminum alloy die-casting parts was tested by clamping the two ends of the test piece with a universal testing machine (model: HT-9102, Hongda Instrument Co., Ltd.), and the average value was taken. The results are shown in Table 4 below.

Table 4 - Tensile Strength Specimen thickness 4 mm 6 mm S0 261 MPa 248 MPa S1 239 MPa 226 MPa S2 191 MPa 188 MPa S4 192 MPa 209 MPa

According to the results in Table 4, ADC12 without additional magnesium addition has higher tensile strength, and as the magnesium content in the aluminum alloy die-casting increases, the tensile strength decreases.

The aluminum alloy die-casting without precipitation hardening treatment was prepared into 4 mm and 6 mm thick test pieces suitable for universal testing machine, 3 pieces each. The test piece size is the same as the test piece for density test. The universal testing machine is used to clamp the two ends of the test piece, and the yield strength of the aluminum alloy die-casting is tested, and the average value is taken. The results are shown in Table 5 below.

Table 5 - Yield Strength Specimen thickness 4 mm 6 mm S0 146 MPa 127 MPa S1 199 MPa 125 MPa S2 200 MPa 174 MPa S4 233 MPa 209 MPa

According to the results in Table 5, ADC12 without additional magnesium block has a lower yield strength, and as the magnesium content in the aluminum alloy die-casting increases, the yield strength gradually increases. Therefore, when used as an elevated floor, it can have a better load-bearing capacity.

The aluminum alloy die-casting parts without precipitation hardening treatment and the aluminum alloy die-casting parts after precipitation hardening treatment were prepared into test pieces suitable for universal testing machine, with thickness of 4 mm and 6 mm, 3 pieces each. The test piece size is the same as the test piece for density test. The elongation of the aluminum alloy die-casting parts was tested by clamping the two ends of the test piece with the universal testing machine, and the average value was taken. The results are shown in Table 6 below.

Table 6 - Elongation Test piece Without precipitation hardening treatment Thickness 4 mm After precipitation hardening treatment, thickness 4 mm S0 0.2% 1.0% S1 0.2% 0.6% S2 0.1% 0.3% S3 0.1% 0.3% S4 0.1% 0.3%

According to the results in Table 6, the yield strength of ADC12 without additional magnesium addition has a higher elongation, and as the magnesium content in the aluminum alloy die-casting increases, the elongation decreases.

The aluminum alloy die-casting parts that have not been subjected to precipitation hardening treatment were prepared into test pieces suitable for hardness testing, with thicknesses of 4 mm and 6 mm, 3 pieces each. The test piece size is the same as the test piece for density testing. The Brinell hardness (HB) of the aluminum alloy die-casting parts was tested using a hardness testing machine (model: TAD-Q5E, Da Chang Trading Co., Ltd.), and the average value was taken. The results are shown in Table 7 below, where standard test conditions were adopted.

Table 7-Brinell Hardness Specimen thickness 4 mm 6 mm S0 148.6 HB 136.3 HB S1 122.0 HB 128.3 HB S2 134.7 HB 134.5 HB S4 144.6 HB 138.1 HB

According to the results in Table 7, the yield strength of ADC12 without additional magnesium block has higher hardness. After slightly increasing the magnesium content in the aluminum alloy die-casting, the hardness suddenly decreases, and then gradually increases with the increase of magnesium content. When adding 5wt% magnesium, the hardness of the aluminum alloy die-casting can reach the level of ADC12.

From the above data, it can be inferred that in the case of high silicon content, further adding magnesium can make magnesium and silicon precipitate Mg ₂ Si strengthening phase during the solidification process of aluminum alloy, which can improve the yield strength of aluminum alloy die-cast parts, but it will be accompanied by sacrificing some tensile strength. For the application of elevated floor, the importance of yield strength is greater than tensile strength. Therefore, the magnesium content in the aluminum alloy elevated floor is adjusted within the specific range described in the present disclosure, which can effectively improve the bearing capacity of the aluminum alloy elevated floor. In addition, the aluminum alloy die-cast parts treated by precipitation hardening can reduce or eliminate segregation phenomenon, which can further highlight the effect of the Mg ₂ Si strengthening phase. As shown in Table 4, the influence of Mg ₂ Si strengthening on elongation becomes greater.

Embodiment 2

According to the content of Example 1, a rectangular aluminum alloy die-casting part is prepared, which contains 4.5 wt% to 5.5 wt% of magnesium. The rectangular aluminum alloy die-casting part is used as an aluminum alloy elevated floor 1 as shown in Figures 11A and 11B, which has a top plate 10 and a side frame 11 and a rib structure 12 arranged below the top plate 10, and can be assembled with a square frame and a supporting frame to form an elevated floor structure. After testing, the aluminum alloy elevated floor has excellent load-bearing capacity.

Embodiment 3

A rectangular aluminum alloy die-casting is prepared as described in Example 2 to form an aluminum alloy elevated floor 2 as shown in FIG. 12 , which has a top plate 10 and a frame 11 and a rib structure 12 (not shown) disposed below the top plate 10. The difference between Example 3 and Example 2 is that the top plate 10 of the aluminum alloy elevated floor is further formed with a plurality of through holes 20, and is a honeycomb plate with a ventilation rate of 17%. The aluminum alloy elevated floor has been tested to have excellent load-bearing capacity.

Embodiment 4

As described in Example 3, the diameter of the through hole 20 of the aluminum alloy elevated floor is enlarged and rectangular, and the grating plate with a ventilation rate of 50% is prepared. The aluminum alloy elevated floor has excellent load-bearing capacity after testing.

Embodiment 5

As described in Example 3, the size of the through hole 20 is large enough to allow the line of sight to easily penetrate to the bottom of the aluminum alloy elevated floor, and a transparent window sheet can be placed on the through hole 20 or embedded in the through hole 20 to close the through hole 20, so that the aluminum alloy elevated floor becomes a window floor. The aluminum alloy elevated floor has been tested to have excellent load-bearing capacity.

1,2: Aluminum alloy raised floor 10: Top plate 11: Frame 12: Rib structure 20: Through hole

Figures 1 to 10 are electron microscope images of the aluminum alloy die-casting part of the aluminum alloy elevated floor disclosed in Example 1, wherein Figures 1, 3, 5, 7 and 9 are electron microscope images of the aluminum alloy die-casting part without precipitation hardening treatment, and Figures 2, 4, 6, 8 and 10 are electron microscope images of the aluminum alloy die-casting part after precipitation hardening treatment.

FIG. 11A is an aluminum alloy elevated floor of Example 2 of the present disclosure; FIG. 11B is an aluminum alloy elevated floor of Example 2 of the present disclosure from another angle.

Figure 12 shows the aluminum alloy elevated floor of Example 3 of the present disclosure.

1: Aluminum alloy raised floor 10: Top plate 11: Side frame

Claims (11)

An aluminum alloy elevated floor comprises an aluminum alloy die-casting, and the aluminum alloy die-casting comprises: 7 to 11 weight % of silicon; 3 to 9 weight % of magnesium; 1 to 3 weight % of copper; and the remainder of aluminum, wherein the aluminum alloy die-casting has a magnesium silicide ( _Mg2Si ) phase; wherein the aluminum alloy die-casting is die-casted from modified ADC12 or die-casted from a mixture of modified ADC5 and ADC14; and wherein the aluminum alloy die-casting has a yield strength of 200 MPa or more. The aluminum alloy elevated floor as described in claim 1 is formed with through holes to serve as a honeycomb panel, a grating panel or a window floor. The aluminum alloy elevated floor as described in claim 1, wherein the surface of the aluminum alloy die-casting is surface treated to form a surface treatment layer selected from at least one of the group consisting of epoxy resin coating, nickel-chromium coating, powder coating, and anodizing treatment. An aluminum alloy elevated floor as described in claim 1, wherein the aluminum alloy die-cast part comprises 7.5 to 9.5 weight % silicon. An aluminum alloy elevated floor as described in claim 1, wherein the aluminum alloy die-cast part comprises 3.5 to 6.5 weight % of magnesium. An aluminum alloy elevated floor as described in claim 1, wherein the aluminum alloy die-cast part comprises 4 to 6 weight % of magnesium. An aluminum alloy elevated floor as described in claim 1, wherein the aluminum alloy die-cast part comprises 1.5 to 2.5 weight % copper. The aluminum alloy elevated floor as described in claim 1, wherein the density of the aluminum alloy die-cast part is greater than 2.6 g/ ^cm3 . The aluminum alloy elevated floor as described in claim 1, wherein the tensile strength of the aluminum alloy die-casting is above 190 MPa. The aluminum alloy elevated floor as described in claim 1, wherein the aluminum alloy die-cast part is artificially aged. The aluminum alloy elevated floor as described in claim 10, wherein the artificial aging treatment is performed at 500°C for 120 minutes.