CN120571752A - Reinforced structure and method for interface between thermal barrier coating and metal matrix - Google Patents
Reinforced structure and method for interface between thermal barrier coating and metal matrixInfo
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- CN120571752A CN120571752A CN202511055032.6A CN202511055032A CN120571752A CN 120571752 A CN120571752 A CN 120571752A CN 202511055032 A CN202511055032 A CN 202511055032A CN 120571752 A CN120571752 A CN 120571752A
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Abstract
本发明属于陶瓷基材料领域，具体涉及到一种热障涂层与金属基体界面的强化结构及方法。包括金属基体和热障涂层；金属基体的连接界面上设置呈矩形网格式排布的强化界面，强化界面包括凹弧面，单个凹弧面的外侧边呈矩形结构，相邻两个强化界面共边；热障涂层的连接界面与金属基体连接界面共形貌并相贴合。即本发明热障涂层与金属基体界面的强化结构，仅通过结构上的改进即可以强化热障涂层与金属基体的连接强度，在高温状态下可以抑制横向裂纹生长，适用于各种材料的金属基体和热障涂层。
The present invention belongs to the field of ceramic-based materials, specifically relating to a structure and method for strengthening the interface between a thermal barrier coating and a metal substrate. The structure comprises a metal substrate and a thermal barrier coating; a strengthening interface arranged in a rectangular grid pattern is provided at the connection interface of the metal substrate, wherein the strengthening interface comprises a concave arc surface, the outer edge of each concave arc surface being a rectangular structure, and two adjacent strengthening interfaces share a common edge; the connection interface of the thermal barrier coating and the connection interface of the metal substrate share the same morphology and conform to each other. In other words, the strengthening structure at the interface between the thermal barrier coating and the metal substrate of the present invention can enhance the connection strength between the thermal barrier coating and the metal substrate through structural improvements alone, inhibit the growth of transverse cracks at high temperatures, and is applicable to metal substrates and thermal barrier coatings of various materials.
Description
Technical Field
The invention belongs to the field of ceramic-based materials, and particularly relates to a strengthening structure and a strengthening method for a thermal barrier coating and metal matrix interface.
Background
The thermal barrier coating is mainly made of ceramic-based materials, such as ZrO, alO and rare earth doping substances thereof, and is generally coated on the surface of the metal matrix to play a role in heat insulation and protection. The application range is usually in extremely high thermal environments, and the environment is extremely severe due to the scouring of high-speed air flow during the flow passage protection of an aeroengine.
Since the coefficient of thermal expansion of ceramic materials is relatively low, it is generally 1110 -6/DEG C or so, while the coefficient of thermal expansion of a metal matrix represented by stainless steel is generally 1810 At about -6/°c, the large difference in thermal expansion coefficients results in a significant difference in elongation of the structure at high temperatures. When the coating is closely adhered to the substrate, huge thermal stress is caused, and when the stress exceeds the limit of bonding strength, the coating and the substrate are separated, so that serious failure phenomena such as cracking, peeling and the like are generated.
For the traditional coating bonding strengthening method, a metal-based bonding layer such as NiCrAlY is added between the ceramic layer and the metal matrix. It has a moderate thermal expansion coefficient, and can provide better thermal adaptation and strain resistance. Through the transition of the bonding layer, the reliable attachment of the ceramic-based thermal barrier coating on the metal matrix is realized. However, under the extremely high temperature condition, the thickness of the thermal barrier coating is increased, a large temperature gradient exists between coating layers, and the problem of poor thermal adaptation still exists in the coating, particularly at the interface.
The invention provides a strengthening design method of a thermal barrier coating and metal matrix interface, which can realize the artificial control of matrix surface morphology by utilizing the inner tightening effect of an intrados ceramic material under the high temperature condition, improve the coating performance of a flat plate or an inner hole piece on the basis of not changing a thermal barrier coating and matrix material system and a process method, effectively solve the problem of weak bonding force and even failure of an extrados coating, realize the remarkable improvement of thermal shock performance of the thermal barrier coating and effectively improve the reusability of the thermal barrier coating.
Disclosure of Invention
The invention aims to provide a strengthening structure and a strengthening method for a thermal barrier coating and metal matrix interface.
The invention provides a strengthening structure of a thermal barrier coating and metal matrix interface, which comprises a metal matrix and a thermal barrier coating;
the connecting interface of the metal matrix is provided with reinforced interfaces which are arranged in a rectangular grid shape, each reinforced interface comprises a concave cambered surface, the outer side edge of a single concave cambered surface is in a rectangular structure, and two adjacent reinforced interfaces are in common edge;
the connecting interface of the thermal barrier coating and the connecting interface of the metal matrix are co-shaped and are attached.
Further, the outer side of the single concave cambered surface is in a square structure.
Further, the radius of the concave cambered surface is 7-70 times of the thickness of the thermal barrier coating.
Further, the side length of the outer side is 2.5-3.5 times of the thickness of the thermal barrier coating, and the side length of the outer side is smaller than the radius of the concave cambered surface.
Further, the radius of the concave cambered surface is 4-10 times of the side length of the outer side edge
Still further, the thermal barrier coating includes a ceramic layer and a bond coat.
Still further, the ceramic layer is zirconia, alumina or tantalate.
Still further, the metal matrix is stainless steel, superalloy, or refractory metal.
Furthermore, the thermal barrier coating is prepared by plasma spraying, and the metal matrix is prepared by 3D printing.
The invention also provides a strengthening method of the interface between the thermal barrier coating and the metal matrix, and the strengthening structure of the interface between the thermal barrier coating and the metal matrix is used;
After the combination of the metal matrix and the thermal barrier coating, on the basis of ensuring the performance of the original thermal barrier coating, the method comprises the following steps:
The thermal barrier coating and the concave cambered surface are combined, so that shear stress generated at a joint interface of the metal matrix and the thermal barrier coating due to the difference of expansion coefficients is decomposed, and a component force in the direction perpendicular to the interface and a component force in the direction along the interface are decomposed, thereby greatly reducing the shear stress in the parallel direction and inhibiting the growth of transverse cracks;
the thermal barrier coating and the concave cambered surface are combined, so that the area of a connecting interface between the metal substrate and the thermal barrier coating is increased, the overall stress area is increased, the strain tolerance of the thermal barrier coating is improved, and the growth of transverse cracks is inhibited;
the outer side edges of the adjacent concave cambered surfaces form peak structures, and stress and crack propagation caused by thermal strain are restrained.
The invention has the beneficial effects that the strengthening structure of the interface between the thermal barrier coating and the metal matrix can strengthen the combination strength of the metal matrix and the thermal barrier coating from the following aspects on the basis of ensuring the performance of the original thermal barrier coating after the combination of the metal matrix and the thermal barrier coating:
on one hand, the thermal barrier coating is combined with the concave cambered surface, so that shear stress generated at a joint interface of the metal matrix and the thermal barrier coating due to the difference of expansion coefficients is decomposed, and a component force in the direction perpendicular to the interface and a component force in the direction along the interface are decomposed, thereby greatly reducing the shear stress in the parallel direction and inhibiting the growth of transverse cracks;
The thermal barrier coating is attached to the metal matrix, and no stress strain exists in the normal-temperature initial state. When the temperature of the structure is increased, larger shearing stress is generated at the joint interface due to the difference of expansion coefficients, and the shearing stress is a main reason for causing transverse crack growth and falling of the thermal barrier coating. In the embodiment, by arranging the concave cambered surface, the shearing stress is greatly reduced, the growth of transverse cracks is further inhibited, and the falling probability of the thermal barrier coating is reduced.
In addition, the bonding force of the thermal barrier coating is high, and the strain in the vertical direction can be well resisted, so that the adverse effect of the component force in the vertical interface direction decomposed by the concave cambered surface on the thermal barrier coating is negligible.
On the other hand, the combination of the thermal barrier coating and the concave cambered surface increases the area of the connecting interface between the metal substrate and the thermal barrier coating, and improves the overall stressed area, which means that the same force or deformation can be shared by the interface with larger area, improves the strain tolerance of the thermal barrier coating, and inhibits the growth of transverse cracks;
in yet another aspect, the outer edges of adjacent concave cambered surfaces form a peak structure that inhibits stress and crack propagation from thermal strain.
Specifically, the peak structure can effectively prevent the propagation of micro cracks formed at the deflection interface in the parallel direction, prevent the cracks from penetrating through the whole interface and prolong the service life. But also can inhibit the stress propagation caused by thermal strain.
The strengthening structure of the interface between the thermal barrier coating and the metal matrix can strengthen the connection strength of the thermal barrier coating and the metal matrix only by structural improvement, can inhibit the growth of transverse cracks at a high temperature, and is suitable for the metal matrix and the thermal barrier coating of various materials. Experiments show that the invention can obtain remarkable improvement of thermal shock performance on the premise of small weight increase of the metal matrix, and can obtain 3-time improvement of thermal shock performance when the concave cambered surface radius of 7 times of the thickness of the thermal barrier coating and the lateral side length of 5 times of the thickness of the thermal barrier coating are adopted. When the concave cambered surface radius is 33 times of the thickness of the thermal barrier coating, the thermal shock performance can still be obtained by 2 times, and the weight of the metal matrix is increased by about 2.21 percent.
Drawings
FIG. 1 is a schematic drawing of a prior art drop-off of a flat thermal barrier coating;
FIG. 2 is a schematic drawing of a thermal barrier coating of the present invention with a reinforced interface;
FIG. 3 is a front view of a metal matrix with a reinforced interface in accordance with the present invention;
FIG. 4 is a schematic structural view of a metal matrix with a reinforced interface according to the present invention;
FIG. 5 is a diagram of the morphology of a test block prior to testing in accordance with the present invention;
FIG. 6 is a graph of the morphology of the test block after testing according to the present invention.
In the figure, 1-metal matrix, 11-reinforced interface, 111-concave arc surface, 112-outer side and 2-thermal barrier coating.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear are used in the embodiments of the present invention) are merely for explaining the relative positional relationship, movement conditions, and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "connected," "fixed" and the like are to be construed broadly, and for example, "fixed" may be a fixed connection, a removable connection or an integral body, may be a mechanical connection, an electrical connection, a physical connection or a wireless communication connection, may be a direct connection or an indirect connection through an intermediary, may be a communication between two elements or an interaction relationship between two elements, unless explicitly specified otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
As shown in the accompanying drawings 1-4, the invention provides a strengthening structure of a thermal barrier coating and metal matrix interface, which comprises a metal matrix 1 and a thermal barrier coating 2, wherein the thermal barrier coating 2 is arranged on the connecting interface of a metal substrate 1, and the connecting interface of the thermal barrier coating 2 is the connecting interface of the thermal barrier coating 2 on the connecting side of the thermal barrier coating 2 and the metal matrix 1.
The connection interface of the metal matrix 1 is provided with the reinforced interfaces 11 which are arranged in a rectangular grid mode, namely the reinforced interfaces 11 are arranged in a rectangular grid mode and are fully paved with the connection interface of the metal matrix 1, and the reinforced interfaces 11 are mutually clung and are arranged in a rectangular array mode. The reinforced interface 11 includes a concave arc surface 111, the concave arc surface 111 is in a spherical cap structure, an outer side 112 of a single concave arc surface 111 is in a rectangular structure, specifically, the outer side 112 of a single concave arc surface 111 is in a rectangular shape in a top view, and each side is in an arc structure. The two adjacent reinforced interfaces 11 are in the same edge, and the outer side edge 112 is the high point of the concave cambered surface 111, so that the edge sharing position of the two reinforced interfaces 11 can form a peak structure;
the connecting interface of the thermal barrier coating 2 and the connecting interface of the metal matrix 1 are co-shaped and are attached. The connection mode of the metal substrate 1 and the thermal barrier coating 2 can be selected according to the needs, for example, the metal substrate 1 and the thermal barrier coating 2 are directly formed integrally (3D printing), or are adhered to each other, or the thermal barrier coating 2 is processed (spraying) on the metal substrate 1.
After the metal substrate 1 and the thermal barrier coating 2 are combined, the strengthening structure of the interface between the thermal barrier coating and the metal substrate provided by the invention can strengthen the combined strength of the metal substrate 1 and the thermal barrier coating 2 from the following aspects on the basis of ensuring the performance of the original thermal barrier coating 2:
On the one hand, the thermal barrier coating 2 is combined with the concave cambered surface 111, so that shear stress generated at the joint interface of the metal substrate 1 and the thermal barrier coating 2 due to the difference of expansion coefficients is decomposed, and a component force in the direction perpendicular to the interface and a component force in the direction along the interface are decomposed, thereby greatly reducing the shear stress in the parallel direction and inhibiting the growth of transverse cracks;
The thermal barrier coating 2 is attached to the metal substrate 1, and no stress strain exists in the normal-temperature initial state. When the temperature of the structure increases, a large shear stress is generated at the bonding interface due to the difference of expansion coefficients, and the shear stress is a main reason for causing the transverse crack growth to fall off the thermal barrier coating 2. In the embodiment, by arranging the concave cambered surface 111, the shearing stress is greatly reduced, the growth of transverse cracks is further inhibited, and the falling probability of the thermal barrier coating 2 is reduced.
In addition, the bonding force of the thermal barrier coating 2 is high, and the strain in the vertical direction can be well resisted, so that the adverse effect of the component force in the vertical interface direction decomposed by the concave cambered surface 111 on the thermal barrier coating 2 is negligible.
On the other hand, the combination of the thermal barrier coating 2 and the concave cambered surface 111 increases the area of the connecting interface between the metal substrate 1 and the thermal barrier coating 2, and improves the whole stressed area, which means that the same force or deformation can be shared by the interface with larger area, improves the strain tolerance of the thermal barrier coating 2, and inhibits the growth of transverse cracks;
In yet another aspect, the outer side 112 of adjacent concave camber 111 forms a peak structure that inhibits thermal strain induced stress and crack propagation.
Specifically, the peak structure can effectively prevent the propagation of micro cracks formed at the deflection interface in the parallel direction, prevent the cracks from penetrating through the whole interface and prolong the service life. But also can inhibit the stress propagation caused by thermal strain.
The strengthening structure of the interface between the thermal barrier coating and the metal matrix can strengthen the connection strength of the thermal barrier coating and the metal matrix only by structural improvement, can inhibit the growth of transverse cracks at a high temperature, and is suitable for the metal matrix and the thermal barrier coating of various materials. Experiments show that the invention can obtain remarkable improvement of thermal shock performance on the premise of small weight increase of the metal matrix 1, and can obtain 3-time improvement of thermal shock performance when the radius of the concave cambered surface 111 with the thickness of 7 times and the side length of the outer side edge 112 with the thickness of 5 times of the thermal barrier coating 2 are adopted. When the thickness of the thermal barrier coating 2 is 33 times of the radius of the concave cambered surface 111, the thermal shock performance of 2 times can still be obtained, and the metal matrix 1 only increases in weight by about 2.21%.
In one embodiment, the outer side 112 of the single concave cambered surface 111 has a square structure. By the arrangement, the consistency of the transverse reinforcing effect and the longitudinal reinforcing effect can be ensured.
In one embodiment, the radius of the concave cambered surface 111 is 7-70 times the thickness of the thermal barrier coating 2. In this way, an enhancement effect, reusability and an acceptable weight gain can be ensured.
In one embodiment, the outer side 112 has a side length that is 2.5-3.5 times the thickness of the thermal barrier coating 2, preferably the outer side 112 has a side length that is 3 times the thickness of the thermal barrier coating 2, and the outer side 112 has a side length that is less than the radius of the concave arc surface 111. In this embodiment, the side length of the outer side edge 112 is determined comprehensively according to the radian of the concave cambered surface 111 and the weight increasing effect brought about by the acceptable strengthening interface 11.
In one embodiment, the radius of concave arcuate surface 111 is 4-10 times the side length of outer side 112. By calculation, when the radius r of the concave cambered surface 111 is greater than 4 times the side length of the outer side edge 112, the increase of the metal base 1 is greatly reduced and tends to be stable.
In one embodiment, the thermal barrier coating 2 comprises a ceramic layer and a bond coat.
By way of example, the ceramic layer is zirconia, alumina or tantalate. The ceramic layer can also be made of other various coating materials.
As an example, the metal matrix 1 is stainless steel, superalloy or refractory metal. The metal matrix 1 can also be made of other various metal structural materials.
In one embodiment, the thermal barrier coating 2 is prepared by plasma spraying and the metal substrate 1 is prepared by 3D printing. Thereby facilitating the production.
The invention also provides a strengthening method of the interface between the thermal barrier coating and the metal matrix, and the strengthening structure of the interface between the thermal barrier coating and the metal matrix is used;
after the combination of the metal matrix 1 and the thermal barrier coating 2, on the basis of ensuring the performance of the original thermal barrier coating 2, the method comprises the following steps:
The thermal barrier coating 2 is combined with the concave cambered surface 111, so that shear stress generated at the joint interface of the metal substrate 1 and the thermal barrier coating 2 due to the difference of expansion coefficients is decomposed, and a component force in the direction perpendicular to the interface and a component force in the direction along the interface are decomposed, thereby greatly reducing the shear stress in the parallel direction and inhibiting the growth of transverse cracks;
The thermal barrier coating 2 is combined with the concave cambered surface 111, so that the area of a connecting interface of the metal substrate 1 and the thermal barrier coating 2 is increased, the overall stressed area is increased, the strain tolerance of the thermal barrier coating 2 is improved, and the growth of transverse cracks is inhibited;
the outer side edges 112 of adjacent concave cambered surfaces 111 form peak structures, and stress and crack propagation caused by thermal strain are restrained.
The invention also provides a method for determining the size of the reinforced interface, referring to fig. 3, wherein r is the radius of the concave cambered surface, alpha is half radian angle, h1 is the thickness of the thin point of the metal matrix, h2 is the thickness of the thick point of the metal matrix, and the height difference of the reinforced interface,。
The size determining method comprises the following steps:
Radius r of concave arc surface 111:
The radius r of the concave arc surface 111 of the strengthening interface 11 is mainly determined according to the thickness of the thermal barrier coating 2. The radius r of the concave cambered surface 111 is one of the main influencing parameters of the height difference of the strengthening interface 11 and the volume change of the metal matrix 1, and needs to be considered according to the desired increase of the reusability and the acceptable balance of weight gain. The thickness of the ceramic layer and the bonding layer of the thermal barrier coating 2 is l, and the radius r of the concave cambered surface 111 is generally 7 l-70 l.
Side length d of outer side edge 112:
Since the concave arc surface 111 is a spherical crown structure, and the outer side 112 is square, the four sides of the outer side 112 are d. The weight gain influence caused by the radian of the concave cambered surface 111 and the acceptable height difference of the strengthening interface is comprehensively determined, and the general value range d is more than 3l and d is less than r.
Weight gain of metal matrix 1:
The weight gain of the metal matrix 1 is calculated by the following procedure:
Half radian angle α:
;
Height difference of reinforced interface:
;
single strengthening interface 11 volume increment:
;
the weight gain calculation formula of the single metal matrix 1 is as follows:
;
Where ρ is the metal matrix material density.
According to the above-mentioned method for determining the size of the reinforced interface, four test pieces were determined, in which the entire side length was 21.6mm and the metal base 1 was a stainless steel test piece having a thickness of 3.7 mm. The side length d=7.2 mm of the single reinforced interface 11, the radii r of the concave cambered surfaces 111 of the four test blocks are respectively 0mm, 10mm, 30mm and 50mm, wherein r=0 is a flat plate coating control group, and the model is shown in fig. 4 by taking r=10 mm test blocks as an example.
The yttrium-stabilized zirconia thermal barrier coating with the thickness of l=1.5 mm is obtained on the connecting interface of the metal matrix 1 by adopting conventional plasma spraying, and a test block before testing is shown in fig. 5.
The four test blocks were kept at 1200 ℃ in a muffle furnace for 10min and then quickly put into water. And testing the thermal shock times required by the falling of each test block. The morphology of the block after the test is shown in fig. 6, and the red number is the number of times of thermal shock test.
The results of each test are counted as follows:
The test shows that the invention can obtain the remarkable improvement of the thermal shock performance on the premise of increasing the tiny weight of the metal matrix 1, and can obtain the 3-time improvement of the thermal shock performance when the arc surface radius of 7 times of the coating thickness and the side length of 5 times of the partition grid are adopted. When the radius of the cambered surface is relaxed to 33 times, the thermal shock performance of 2 times can still be obtained, and the metal matrix 1 only has a weight gain of about 2.21%.
The weight increase of the metal matrix 1 is mainly dominated by the side length of the outer side 112 and the radius r of the concave cambered surface 111, and the calculation result shows that when the radius r of the concave cambered surface 111 is more than 4 times of the side length of the outer side 112, the weight increase of the metal matrix 1 is greatly reduced and tends to be stable, so that the value range of the radius r of the concave cambered surface 111 is 4d-10d.
The above description is merely the present embodiment, and is not intended to limit the present invention. Many possible variations, modifications, or adaptations of the present invention to its embodiments may be made by one skilled in the art without departing from the scope of the invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall fall within the scope of the technical solution of the present invention.
Claims (10)
1. The strengthening structure of the interface between the thermal barrier coating and the metal matrix is characterized by comprising a metal matrix (1) and the thermal barrier coating (2);
The connecting interface of the metal matrix (1) is provided with reinforced interfaces (11) which are arranged in a rectangular grid shape, each reinforced interface (11) comprises a concave cambered surface (111), the outer side (112) of each concave cambered surface (111) is in a rectangular structure, and two adjacent reinforced interfaces (11) are in common side;
the connecting interface of the thermal barrier coating (2) and the connecting interface of the metal matrix (1) are co-shaped and are attached.
2. A reinforced structure of a thermal barrier coating and metal matrix interface as claimed in claim 1, characterized in that the outer side (112) of a single concave arc surface (111) has a square structure.
3. A strengthening structure of the interface of a thermal barrier coating and a metal substrate as claimed in claim 1, characterized in that the radius of the concave cambered surface (111) is 7-70 times the thickness of the thermal barrier coating (2).
4. The reinforcing structure of the interface of a thermal barrier coating and a metal matrix according to claim 1, characterized in that the side length of the outer side (112) is 2.5-3.5 times the thickness of the thermal barrier coating (2), and that the side length of the outer side (112) is smaller than the radius of the concave arc surface (111).
5. The strengthening structure of the interface of a thermal barrier coating and a metal substrate according to claim 1, characterized in that the radius of the concave arc surface (111) is 4-10 times the side length of the outer side (112).
6. A reinforced structure of a thermal barrier coating and metal matrix interface as claimed in any one of claims 1-4, characterized in that the thermal barrier coating (2) comprises a ceramic layer and a bonding layer.
7. The reinforced structure of the thermal barrier coating and metal matrix interface of claim 5 wherein the ceramic layer is zirconia, alumina or tantalate.
8. A reinforced structure of a thermal barrier coating and metal matrix interface as claimed in any of claims 1-4, characterized in that the metal matrix (1) is stainless steel, superalloy or refractory metal.
9. The reinforced structure of the interface between the thermal barrier coating and the metal matrix according to any one of claims 1 to 4, characterized in that the thermal barrier coating (2) is prepared by plasma spraying and the metal matrix (1) is prepared by 3D printing.
10. A method for strengthening the interface between a thermal barrier coating and a metal substrate, characterized in that a strengthening structure of the interface between a thermal barrier coating and a metal substrate as claimed in any one of claims 1 to 8 is used;
After the combination of the metal matrix (1) and the thermal barrier coating (2), on the basis of ensuring the performance of the original thermal barrier coating (2), the method comprises the following steps:
The thermal barrier coating (2) is combined with the concave cambered surface (111), so that shear stress generated at a joint interface between the metal substrate (1) and the thermal barrier coating (2) due to the difference of expansion coefficients is decomposed, a component force in the direction perpendicular to the interface and a component force in the direction along the interface are decomposed, the shear stress in the parallel direction is greatly reduced, and the growth of transverse cracks is inhibited;
The thermal barrier coating (2) is combined with the concave cambered surface (111), so that the area of a connecting interface of the metal substrate (1) and the thermal barrier coating (2) is increased, the whole stress area is increased, the strain tolerance of the thermal barrier coating (2) is improved, and the growth of transverse cracks is inhibited;
the outer side edges (112) of adjacent concave cambered surfaces (111) form peak structures, and stress and crack propagation caused by thermal strain are restrained.
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| CN202511055032.6A CN120571752B (en) | 2025-07-30 | A strengthening structure and method for the interface between thermal barrier coating and metal substrate |
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