CN116160019A - Metal bonding layer and preparation method and application thereof - Google Patents

Metal bonding layer and preparation method and application thereof Download PDF

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Publication number
CN116160019A
CN116160019A CN202310216175.5A CN202310216175A CN116160019A CN 116160019 A CN116160019 A CN 116160019A CN 202310216175 A CN202310216175 A CN 202310216175A CN 116160019 A CN116160019 A CN 116160019A
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Prior art keywords
bonding layer
texture
metal bonding
dimensional
interface
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Inventor
张显程
赵晓峰
罗丽荣
张丁武
石俊秒
涂善东
王卫泽
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East China University of Science and Technology
Shanghai Jiaotong University
China United Heavy Gas Turbine Technology Co Ltd
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East China University of Science and Technology
Shanghai Jiaotong University
China United Heavy Gas Turbine Technology Co Ltd
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Priority to CN202310216175.5A priority Critical patent/CN116160019A/en
Publication of CN116160019A publication Critical patent/CN116160019A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Abstract

The invention belongs to the technical field of thermal barrier coatings, and particularly relates to a metal bonding layer and a preparation method and application thereof. The preparation method of the metal bonding layer provided by the invention comprises the following steps: after constructing a three-dimensional digital model of the metal bonding layer, carrying out laser selective melting 3D printing on the surface of the high-temperature alloy matrix according to the three-dimensional digital model to obtain the metal bonding layer; the adhesive layer matrix and the three-dimensional texture are prepared from NiCoCrAlY powder and/or NiCrAlY powder independently. According to the preparation method provided by the invention, the bonding layer printing is realized through a laser selective melting technology, and a compact bonding layer with few defects can be obtained, so that the growth rate of oxides generated in a service environment is reduced, the generation of an interface spinel phase is inhibited, and the interface stability and the thermal cycle life are further improved; through the construction of the three-dimensional structure of the interface, the mechanical occlusion of the interface is promoted, and the crack of the interface is blocked to be combined into a large size, so that the bonding strength of the interface is increased.

Description

Metal bonding layer and preparation method and application thereof
Technical Field
The invention belongs to the technical field of thermal barrier coatings, and particularly relates to a metal bonding layer and a preparation method and application thereof.
Background
The thermal barrier coating is widely applied to the surfaces of hot end components of aeroengines and ground gas turbines, such as combustion chambers, blades and the like, and provides thermal protection for the hot end components. The traditional thermal barrier coating consists of a low-thermal-conductivity ceramic layer, a metal bonding layer and a thermally grown oxide layer generated at the interface between the ceramic layer and the bonding layer in a thermal service environment. The ceramic layer and the bonding layer are combined in a mechanical engagement mode, and the bonding force is weak. In the thermal service process, interfacial stress caused by mismatch of thermal expansion of the ceramic layer and the metal layer, thermal stress caused by oxide growth and the like can cause initiation and expansion of interfacial cracks, and finally large-size cracks and peeling of a coating are caused. Therefore, the improvement of the bonding strength and the stability of the coating interface is the key of long-term stable service of the thermal barrier coating.
To improve the interfacial stability, the main methods currently include interface blasting and bond layer structure optimization. The interface mechanical engagement can be promoted by improving the interface roughness through sand blasting, so that the interface bonding strength of the coating is improved; the structure of the bonding layer is optimized through the preparation method and process adjustment, and the oxidation rate of the bonding layer is reduced, so that the interface bonding strength is improved. However, the interface roughness is low after the sand blasting treatment, and the propagation of the interface crack cannot be blocked. The Chinese patent ZL201410797898.X introduces a three-dimensional texture at the interface between the ceramic layer and the bonding layer of the thermal barrier coating in a coaxial laser powder feeding mode, and the result shows that the three-dimensional texture can effectively block the expansion of the crack at the interface, improve the interface bonding strength and prolong the service life of the thermal barrier coating. In the method, the bonding layer is mainly prepared by an atmospheric plasma spraying method, and then a grafting method is adopted to prepare the three-dimensional texture by using a coaxial laser powder feeding method. In the grafting process, the problems of weak binding force and dimensional deviation can be generated, so that the interface stability of the thermal barrier coating is poor.
Disclosure of Invention
The invention aims to provide a metal bonding layer, a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of a metal bonding layer, which comprises a bonding layer matrix and a three-dimensional texture on the surface of the bonding layer matrix, and comprises the following steps:
after constructing a three-dimensional digital model of the metal bonding layer, carrying out laser selective melting 3D printing on the surface of the high-temperature alloy matrix according to the three-dimensional digital model to obtain the metal bonding layer;
the adhesive layer matrix and the three-dimensional texture are prepared from NiCoCrAlY powder and/or NiCrAlY powder independently.
Preferably, the particle size of the raw materials for preparing the bonding layer matrix is 30-100 mu m;
the particle size of the preparation raw material of the three-dimensional texture is 10-60 mu m.
Preferably, the laser power of the selective laser melting is 50-100W, and the scanning speed is 50-700 mm/s.
Preferably, the diameter of the laser spot melted by the laser selective area is 50-200 mu m, and the track superposition rate is 10-70%.
Preferably, the thickness of the single-layer powder layer melted by the laser selective area is 20-100 mu m, and the stacking layer number is 2-500.
The invention also provides the metal bonding layer prepared by the preparation method of the technical scheme, and the metal bonding layer comprises a bonding layer matrix and a three-dimensional texture on the surface of the bonding layer matrix.
Preferably, the thickness of the adhesive layer matrix is 50-1000 μm;
the height of the three-dimensional texture is 20-1000 mu m, and the width is 50-1000 mu m.
Preferably, the three-dimensional texture comprises a discrete texture or a continuous texture;
the discrete texture comprises a dot texture, a columnar texture or a branch texture;
the continuous texture includes a zigzag texture, a triangular texture, a square texture, or a hexagonal texture.
The invention also provides application of the metal bonding layer in the thermal barrier coating.
Preferably, the thermal barrier coating comprises a metal bonding layer and a ceramic layer positioned on one side surface of the three-dimensional texture in the metal bonding layer;
the metal bonding layer is the metal bonding layer in the technical scheme;
the ceramic layer is a yttrium stabilized zirconia ceramic layer.
The invention provides a preparation method of a metal bonding layer, which comprises a bonding layer matrix and a three-dimensional texture on the surface of the bonding layer matrix, and comprises the following steps: after constructing a three-dimensional digital model of the metal bonding layer, carrying out laser selective melting 3D printing on the surface of the high-temperature alloy matrix according to the three-dimensional digital model to obtain the metal bonding layer; the adhesive layer matrix and the three-dimensional texture are prepared from NiCoCrAlY powder and/or NiCrAlY powder independently. According to the preparation method provided by the invention, the bonding layer printing is realized through a laser selective melting technology, and the bonding layer which is compact and has few defects such as holes, cracks and oxide inclusions can be obtained, so that the growth rate of oxide generated in a service environment is reduced, the generation of an interface spinel phase is inhibited, and the interface stability and the thermal cycle life are further improved; through the construction of the three-dimensional structure of the interface, the mechanical occlusion of the interface is promoted, and the crack of the interface is blocked to be combined into a large size, so that the bonding strength of the interface is increased. Meanwhile, compared with coaxial powder feeding, the laser selective melting technology can avoid the problem of superposition of the thickness of the texture in the track crossing area, and is beneficial to uniformity of complex three-dimensional textures; the bonding layer and the interface texture are integrally formed, so that the problems of weak bonding force and dimensional deviation during grafting of the interface texture and a bonding layer matrix can be avoided, and the method has the advantages of simplicity in operation, high forming degree, no pollution, few procedures and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic cross-sectional view of a surface and a thermal barrier coating of a zigzag texture, a triangular texture, a square texture, and a hexagonal texture, wherein L is a fractal length, θ is a bifurcation angle or a texture included angle, w is a width, h is a height, R is a top curvature, 1 is a three-dimensional texture of a metal bonding layer, 2 is a ceramic layer, 3 is a bonding layer matrix of the metal bonding layer, and 4 is a superalloy matrix layer;
FIG. 2 is a physical view of the metal bonding layer obtained in example 2;
fig. 3 is a schematic view showing the surface morphology of the metal adhesive layer obtained in example 2 and comparative example 2 before and after the thermal cycle test.
Detailed Description
The invention provides a preparation method of a metal bonding layer, which comprises a bonding layer matrix and a three-dimensional texture on the surface of the bonding layer matrix, and comprises the following steps:
after constructing a three-dimensional digital model of the metal bonding layer, carrying out laser selective melting 3D printing on the surface of the high-temperature alloy matrix according to the three-dimensional digital model to obtain the metal bonding layer;
the adhesive layer matrix and the three-dimensional texture are prepared from NiCoCrAlY powder and/or NiCrAlY powder independently.
In the present invention, all raw material components are commercially available products well known to those skilled in the art unless specified otherwise.
In the present invention, the superalloy substrate is preferably a GH738 superalloy substrate.
In the present invention, before the 3D printing, the method further preferably includes sequentially performing cleaning, degreasing and sand blasting on the superalloy substrate; the process of cleaning, degreasing and blasting is not particularly limited in the present invention, and may be performed in a manner well known to those skilled in the art.
In the invention, the laser power of the selective laser melting is preferably 50-100W, more preferably 60-90W, and most preferably 70-80W; the scanning rate is preferably 50 to 700mm/s, more preferably 80 to 500mm/s, most preferably 100 to 300mm/s; the diameter of the laser spot of the laser selective melting is preferably 50-200 mu m, more preferably 60-180 mu m, and most preferably 70-150 mu m; the track stacking ratio is preferably 10 to 70%, more preferably 20 to 60%, and most preferably 30 to 50%.
In the invention, the running track of the selective laser melting is preferably set by three-dimensional software; the process of setting the running track is not particularly limited, and may be performed in a manner well known to those skilled in the art.
In the present invention, the selective laser melting is preferably performed under an inert gas atmosphere; the inert gas is preferably argon; the present invention is not limited to any particular manner of providing an inert gas environment, and may be practiced with oxygen levels below 1000ppm by means well known to those skilled in the art.
In the invention, the thickness of the single-layer powder spreading melted by the laser selective area is preferably 20-100 mu m, more preferably 30-80 mu m, and most preferably 40-60 mu m; the number of stacked layers is preferably 2 to 500, more preferably 2 to 100, and most preferably 10 to 30.
In the present invention, the raw materials for preparing the adhesive layer matrix and the three-dimensional texture independently comprise NiCoCrAlY powder and/or NiCrAlY powder, preferably NiCoCrAlY powder; the particle size of the raw material for preparing the adhesive layer matrix is preferably 30-100 μm, more preferably 40-90 μm, and most preferably 50-80 μm; the particle size of the raw material for producing the three-dimensional texture is preferably 10 to 60. Mu.m, more preferably 20 to 50. Mu.m, most preferably 30 to 40. Mu.m.
According to the preparation method provided by the invention, the bonding layer printing is realized through a laser selective melting technology, and the bonding layer which is compact and has few defects such as holes, cracks and oxide inclusions can be obtained, so that the growth rate of oxide generated in a service environment is reduced, the generation of an interface spinel phase is inhibited, and the interface stability and the thermal cycle life are further improved; through the construction of the three-dimensional structure of the interface, the mechanical occlusion of the interface is promoted, and the crack of the interface is blocked to be combined into a large size, so that the bonding strength of the interface is increased. In addition, compared with coaxial powder feeding, the laser selective melting technology can avoid the problem of superposition of the thickness of the texture in the track crossing area, and is beneficial to uniformity of complex three-dimensional textures; the bonding layer and the interface texture are integrally formed, so that the problems of mismatching and size deviation during grafting of the interface texture and the bonding layer or a matrix can be avoided, and the method has the advantages of simplicity in operation, high forming degree, no pollution, few procedures and the like.
Meanwhile, the preparation method of the metal bonding layer provided by the invention applies the laser cladding technology to the construction of the metal interface layer with the three-dimensional texture on the surface, and can realize the construction of the high-precision three-dimensional texture, thereby realizing the controllable preparation of the surface roughness of the thermal barrier coating, avoiding the problem of weak bonding force caused by too low surface roughness and avoiding the influence of surface aerodynamics in the application environment caused by too high surface roughness.
The invention also provides the metal bonding layer obtained by the preparation method of the technical scheme, and the metal bonding layer comprises a bonding layer matrix and a three-dimensional texture on the surface of the bonding layer matrix.
In the present invention, the thickness of the adhesive layer matrix is preferably 50 to 1000. Mu.m, more preferably 80 to 500. Mu.m, and most preferably 100 to 300. Mu.m.
In the present invention, the height of the three-dimensional texture is preferably 20 to 1000 μm, more preferably 50 to 500 μm, and most preferably 80 to 300 μm; the width is preferably 50 to 1000. Mu.m, more preferably 80 to 500. Mu.m, most preferably 100 to 300. Mu.m.
In the present invention, the three-dimensional texture preferably includes a discrete texture or a continuous texture; the discrete texture preferably comprises a punctiform texture, a columnar texture or a dendritic texture; the continuous texture preferably comprises a zigzag texture, a triangular texture, a square texture or a hexagonal texture.
In the present invention, the pitch of the dot-like texture is preferably 1 to 30mm, more preferably 2 to 20mm, and most preferably 3 to 10mm.
In the present invention, the pitch of the columnar textures is preferably 1 to 30mm, more preferably 2 to 20mm, and most preferably 3 to 10mm.
In the present invention, the pitch of the dendritic texture is preferably 1 to 30mm, more preferably 2 to 20mm, and most preferably 3 to 10mm; the fractal length is preferably 40 to 600. Mu.m, more preferably 60 to 500. Mu.m, most preferably 100 to 400. Mu.m; the bifurcation angle is preferably 10 to 180 °, more preferably 30 to 150 °, and most preferably 60 to 120 °; the number of fork stages is preferably 1 to 3 stages, more preferably 2 to 3 stages.
In the present invention, the pitch of the zigzag texture is preferably 1 to 30mm, more preferably 2 to 20mm, and most preferably 3 to 10mm; the length is preferably 1 to 20mm, more preferably 3 to 18mm, most preferably 5 to 15mm; the included angle is preferably 30 to 180 °, more preferably 60 to 150 °, and most preferably 90 to 120 °.
In the present invention, the length of the triangular texture is preferably 1 to 20mm, more preferably 3 to 18mm, and most preferably 5 to 15mm; the included angle is preferably 30 to 180 °, more preferably 60 to 150 °, and most preferably 90 to 120 °.
In the present invention, the length of the square texture is preferably 1 to 20mm, more preferably 3 to 18mm, and most preferably 5 to 15mm; the included angle is preferably 30 to 120 °, more preferably 60 to 120 °, and most preferably 90 °.
In the present invention, the length of the hexagonal texture is preferably 1 to 20mm, more preferably 3 to 18mm, and most preferably 5 to 15mm; the angle is preferably 120 °.
The invention also provides application of the metal bonding layer in the thermal barrier coating.
In the invention, the thermal barrier coating preferably comprises a metal bonding layer and a ceramic layer positioned on one side surface of the three-dimensional texture in the metal bonding layer; the metal bonding layer is the metal bonding layer in the technical scheme; the ceramic layer is preferably an yttrium stabilized zirconia ceramic layer; the thickness of the ceramic layer is preferably 0.1 to 1mm, more preferably 0.2 to 0.8mm, and most preferably 0.3 to 0.6mm.
In the invention, the ceramic layer is preferably arranged on the three-dimensional texture surface of the metal bonding layer in a plasma spraying manner; the plasma spraying process is not particularly limited in the present invention, and may be performed in a manner well known to those skilled in the art.
For further explanation of the present invention, the metal adhesive layer, the preparation method and application thereof provided by the present invention are described in detail below with reference to the accompanying drawings and examples, but they should not be construed as limiting the scope of the present invention.
Example 1
And carrying out ultrasonic cleaning, degreasing and sand blasting on the GH738 superalloy substrate. Parameters of the bonding layer matrix and the three-dimensional texture are set through a program, then a laser selective melting technology is adopted, and the bonding layer matrix and the triangular texture are integrally formed through layer-by-layer stacking, so that the metal bonding layer is obtained. The construction of the metal bonding layer adopts NiCoCrAlY powder with the grain diameter of 30-60 mu m, the powder feeding mode is a powder laying method, the thickness of single-layer powder laying is 40 mu m, and the number of stacked layers is 4. The laser power adopted by the selective laser melting is 70W, the diameter of a light spot is 75 mu m, the scanning speed is 100mm/s, and the track superposition rate is 30%. To prevent oxidation, the oxidation is carried out under the protection of inert gas argon, and the oxygen content is lower than 1000ppm. The included angle of the triangular texture is 60 degrees, the length is 5mm, the width is 150 mu m, and the height is 80 mu m. The thickness of the obtained bonding layer matrix is 150 mu m, and the density of the obtained metal bonding layer is 98.3%.
And depositing a Yttrium Stabilized Zirconia (YSZ) ceramic layer with the thickness of 300 mu m on the three-dimensional texture surface of the obtained metal bonding layer by adopting an atmospheric plasma spraying method to obtain the thermal barrier coating.
Example 2
A metallic bonding layer was prepared according to the technical scheme described in example 1, except that the three-dimensional texture was a square texture. The included angle of the tetragonal texture is 90 degrees, the length is 5mm, the width is 150 mu m, and the height h is 150 mu m. The density of the obtained metal bonding layer is 98.5%.
And (3) depositing a YSZ ceramic layer with the thickness of 300 mu m on the three-dimensional texture surface of the obtained metal bonding layer by adopting an atmospheric plasma spraying method to obtain the thermal barrier coating.
Example 3
A metallic bonding layer was prepared according to the technical scheme described in example 1, except that the three-dimensional texture was a punctiform texture. The dot texture had a pitch of 3mm, a height of 120 μm and a width (diameter) of 100. Mu.m. The density of the obtained metal bonding layer is 98.7%.
And (3) depositing a YSZ ceramic layer with the thickness of 300 mu m on the three-dimensional texture surface of the obtained metal bonding layer by adopting an atmospheric plasma spraying method to obtain the thermal barrier coating.
Comparative example 1
And preparing the NiCoCrAlY metal bonding layer and the YSZ ceramic layer by adopting a plasma spraying mode to obtain the thermal barrier coating. The thickness of the metal bonding layer is 150 μm, and the thickness of the ceramic layer is 300 μm.
Comparative example 2
And carrying out ultrasonic cleaning, degreasing and sand blasting on the GH738 superalloy substrate. And preparing the metal bonding layer by adopting a laser coaxial powder feeding mode. The metal bonding layer is constructed by adopting NiCoCrAlY powder with the particle size of 30-80 mu m, the powder feeding mode is coaxial powder feeding, and the powder feeding amount is 2g/min. The rated laser power is 500W, the spot diameter is 70 mu m, the laser power is 80W, and the scanning speed is 7mm/s. The bonding layer is prepared in a track superposition mode, and the track superposition rate is 50%. Under the protection of inert gas argon, the oxygen content is lower than 1000ppm. The included angle of the tetragonal texture is 90 degrees, the length is 5mm, the width is 150 mu m, and the height h is 150 mu m.
And depositing a Yttrium Stabilized Zirconia (YSZ) ceramic layer with the thickness of 300 mu m on the three-dimensional texture surface of the obtained metal bonding layer by adopting an atmospheric plasma spraying method to obtain the thermal barrier coating.
Test example 1
The thermal barrier coatings described in examples 1-3 and comparative example 1 were subjected to an interfacial bond strength test, a surface roughness test, and a thermal cycle life test: testing the interface bonding strength by a stretching method; surface root mean square roughness S of sample by surface profiler q The method comprises the steps of carrying out a first treatment on the surface of the The thermal cycle life was tested by thermal cycle experiments. Each thermal cycle consisted of heating from room temperature to 1100 ℃ at 5 ℃/min, holding for 50min, then forced ventilation to cool rapidly to room temperature, and repeating the above work for 5min intervals for the next cycle experiment. After each cycle, the ceramic layer was inspected for cracking or spalling, and when the spalling rate of the test specimen reached 20%, the specimen was considered to be ineffective. The test results are shown in Table 1.
Table 1 interface bond strength test, surface roughness test, and thermal cycle life test data
Figure BDA0004115424540000081
As can be seen from table 1, the test results of comparative example 1 are: surface root mean square roughness S q 23.9 μm, an interfacial bonding strength of 23.4MPa, and a thermal cycle life of 1370 times; compared with the thermal barrier coating obtained in comparative example 1, the thermal barrier coating obtained in example 1 has a surface root mean square roughness S q 23.9 μm, 0% improvement, 49.1MPa interfacial bond strength, 110% improvement, 1828 times thermal cycle life, 33% improvement; surface root mean square roughness S of thermal barrier coating obtained in example 2 q 25.9 mu m, 0% improvement, 54.6MPa interface bonding strength, 134% improvement, 2099 times of thermal cycle life and 52% improvement; surface root mean square roughness S of thermal barrier coating obtained in example 2 q The interface bonding strength is improved by 20 percent and is improved by 49.5MPa by 31.2 mu m, 112 percent, the thermal cycle life is improved by 1957 times and 42 percent. It can be seen that the preparation method of the metal bonding layer provided by the invention applies the laser cladding technology toThe construction of the metal interface layer with the three-dimensional texture on the surface can realize the construction of the high-precision three-dimensional texture, thereby realizing the controllable preparation of the surface roughness of the thermal barrier coating, avoiding the influence of surface aerodynamics in the application environment, and simultaneously greatly improving the interface bonding strength and the thermal cycle life of the thermal barrier coating.
Test example 2
The thermal barrier coatings obtained in example 2 and comparative example 2 were subjected to a comparative as-prepared and a thermal cycle test. The results are shown in fig. 3, wherein fig. a is a schematic surface morphology of the metal bonding layer obtained in comparative example 2, fig. b is a schematic surface morphology of the metal bonding layer obtained in comparative example 2 after thermal cycle failure, fig. c is a schematic surface morphology of the metal bonding layer obtained in example 2, fig. d is a schematic surface morphology of the metal bonding layer obtained in example 2 after thermal cycle failure, fig. 1 is an overlapping region of the track, and fig. 2 is an overlapping region of the coating after thermal cycle failure.
As can be seen from fig. 3, the texture layer prepared by the laser coaxial powder feeding method has a significant thickness overlapping area in the track overlapping area, and after thermal cycle experiments, the coating layer is easily peeled off in the area. The laser selective melting technology can avoid the problem through laser track design, namely no obvious thickness superposition exists in the track crossing area, and no obvious top drop exists after thermal circulation.
According to the method provided by the embodiment of the invention, the bonding layer printing is realized through the laser selective melting technology, and the bonding layer which is compact and has few defects such as holes, cracks, oxide inclusions and the like can be obtained, so that the growth rate of oxide generated in a service environment is reduced, the generation of an interface spinel phase is inhibited, and the interface stability and the thermal cycle life are further improved; through the construction of the three-dimensional structure of the interface, the mechanical occlusion of the interface is promoted, and the crack of the interface is blocked to be combined into a large size, so that the bonding strength of the interface is increased. Meanwhile, compared with coaxial powder feeding, the laser selective melting technology can avoid the problem of superposition of the thickness of the texture in the track crossing area, and is beneficial to uniformity of complex three-dimensional textures; the bonding layer and the interface texture are integrally formed, so that the problems of mismatching and size deviation during grafting of the interface texture and the bonding layer or a matrix can be avoided, and the method has the advantages of simplicity in operation, high forming degree, no pollution, few procedures and the like.
Although the foregoing embodiments have been described in some, but not all embodiments of the invention, other embodiments may be obtained according to the present embodiments without departing from the scope of the invention.

Claims (10)

1. The preparation method of the metal bonding layer comprises a bonding layer substrate and a three-dimensional texture on the surface of the bonding layer substrate, and is characterized by comprising the following steps of:
after constructing a three-dimensional digital model of the metal bonding layer, carrying out laser selective melting 3D printing on the surface of the high-temperature alloy matrix according to the three-dimensional digital model to obtain the metal bonding layer;
the adhesive layer matrix and the three-dimensional texture are prepared from NiCoCrAlY powder and/or NiCrAlY powder independently.
2. The method according to claim 1, wherein the particle size of the raw material for producing the adhesive layer matrix is 30 to 100 μm;
the particle size of the preparation raw material of the three-dimensional texture is 10-60 mu m.
3. The method of claim 1, wherein the laser selective melting laser power is 50-100W and the scanning rate is 50-700 mm/s.
4. A method of producing according to claim 1 or 3, wherein the laser spot diameter of the selective laser melting is 50 to 200 μm and the track overlay ratio is 10 to 70%.
5. The preparation method according to claim 1, wherein the thickness of the single-layer powder layer melted by the laser selective area is 20-100 μm, and the number of stacked layers is 2-500.
6. The metal bonding layer prepared by the preparation method according to any one of claims 1 to 5, wherein the metal bonding layer comprises a bonding layer matrix and a three-dimensional texture on the surface of the bonding layer matrix.
7. The metallic bonding layer according to claim 6, wherein said bonding layer matrix has a thickness of 50 to 1000 μm;
the height of the three-dimensional texture is 20-1000 mu m, and the width is 50-1000 mu m.
8. The metallic bonding layer of claim 6 or 7, wherein the three-dimensional texture comprises a discrete texture or a continuous texture;
the discrete texture comprises a dot texture, a columnar texture or a branch texture;
the continuous texture includes a zigzag texture, a triangular texture, a square texture, or a hexagonal texture.
9. Use of a metallic bond coat as claimed in any one of claims 6 to 8 in a thermal barrier coating.
10. The use of claim 9, wherein the thermal barrier coating comprises a metallic bond coat and a ceramic layer on one side surface of the three-dimensional texture in the metallic bond coat;
the metal bonding layer is any one of 6 to 8;
the ceramic layer is a yttrium stabilized zirconia ceramic layer.
CN202310216175.5A 2023-03-07 2023-03-07 Metal bonding layer and preparation method and application thereof Pending CN116160019A (en)

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