Bond coat material for thermal barrier / environmental barrier coatings and method of making same, thermal barrier / environmental barrier coatings, engines

Abstract

The application belongs to the technical field of thermal protection coating materials, and discloses a bonding layer material for thermal barrier / environment barrier coating, a preparation method of the bonding layer material, a thermal barrier / environment barrier coating and an engine. 13 The bonding layer material for the thermal barrier / environment barrier coating comprises xSiC*yAl6Si2O 13 zHfSiO4*(1-x-y-z)HfO2, wherein x, y and z are volume percentages, x=0%~70%, y=0%~70%, z=0%~70%, and 30%≤x+y+z≤70%. The bonding layer material for the thermal barrier / environment barrier coating can improve the use temperature of a substrate, and has the advantages of high melting point, low thermal expansion coefficient and high fracture toughness.

Description

Technical Field

[0001] This invention belongs to the technical field of thermal protective coating materials, specifically relating to an adhesive layer material for thermal barrier / environmental barrier coatings and its preparation method, thermal barrier / environmental barrier coatings, and engines. Background Technology

[0002] The performance of aero-engines directly determines the overall capability of an aircraft and is a crucial indicator of a nation's scientific and technological strength and defense capabilities. For a long time, improving engine performance has primarily relied on increasing turbine inlet temperature, which places extremely high demands on the materials used in its high-temperature components. However, traditional technologies based on high-temperature alloys, thermal barrier coatings, and film cooling have pushed the limits of increasing exhaust gas temperature, resulting in slow progress over the past decade. Developing more heat-resistant alternative materials has become critical, with ceramic matrix composites (CMCs) considered the most promising area for development.

[0003] The application of CMCs (Combustion Molding Capacitors) materials in the past five years has significantly increased engine operating temperatures by 100-200°C, becoming a crucial breakthrough direction for future aero-turbine engines. Leading international engine models, such as the LEAP and GE9X engines, have successfully applied CMCs materials to core hot-end components like high-pressure turbine blades and combustion chambers, achieving significant improvements in fuel efficiency and obtaining airworthiness certification. Although domestic research in this area started relatively late, the development of CMCs materials and their protective coatings has become one of the key technological directions being tackled in the aerospace field both domestically and internationally.

[0004] Despite the high-temperature resistance, low density, and excellent high-temperature mechanical properties of CMCs, their practical application is limited by the susceptibility of the SiC matrix to water vapor oxidation and corrosion in the high-temperature exhaust environment of engines. Therefore, a thermal / environmental barrier coating (T / EBC) is needed to simultaneously isolate them from high-temperature corrosion and thermal shock. Currently, mainstream rare-earth silicate coatings can extend the operating temperature of CMCs to 1300-1400℃. However, the traditional silicon (Si) binder layer in the environmental barrier coating (EBC) has a low melting point (approximately 1414℃), limiting the long-term operating temperature of the entire coating system to below 1350℃, which is insufficient to meet the requirements of next-generation aero-engines for hot-end components to operate at temperatures of 1500℃ and above. Furthermore, the Si binder layer undergoes significant volume expansion during high-temperature oxidation to form thermally grown SiO2 oxide (TGO). Upon cooling to approximately 240℃, SiO2 undergoes a phase transition from β-cristobalite to α-cristobalite, accompanied by volume contraction. This periodic volume change accumulates high stress within the coating, leading to crack formation and ultimately coating peeling failure. Meanwhile, in high-temperature, high-flow-rate gas environments, water vapor accelerates the corrosion of Si materials, and traditional Si bonding layers are insufficient for long-term protection of the substrate.

[0005] Therefore, developing a new type of ultra-high temperature bonding layer that can withstand extreme environments of 1500℃ and has better thermal compatibility and resistance to water and oxygen corrosion has become a core technological challenge and urgent task to break through the performance bottleneck of existing aero-engines and ensure the reliable service of hot-end components of ceramic matrix composites. Summary of the Invention

[0006] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one object of this invention is to provide a bonding layer material for thermal barrier / environmental barrier coatings and its preparation method, a thermal barrier / environmental barrier coating, and an engine. The bonding layer material for thermal barrier / environmental barrier coatings provided by this invention can balance a high melting point, a low coefficient of thermal expansion, and high fracture toughness.

[0007] In a first aspect, the present invention provides an adhesive layer material for thermal barrier / environmental barrier coatings, the adhesive layer material comprising: xSiC•yAl6Si2O 13 •zHfSiO4•(1-xyz)HfO2, where x, y and z are volume percentages, x=0%~70%, y=0%~70%, z=0%~70%, and 30%≤x+y+z≤70%.

[0008] The adhesive layer material for thermal barrier / environmental barrier coatings according to the above embodiments of the present invention, based on HfO2, incorporates a second and third phase and controls the composition ratio to achieve a higher melting point and stronger fracture toughness. This increases the service temperature while ensuring the material has a coefficient of thermal expansion compatible with the substrate. Specifically, considering the total volume of the adhesive layer material for thermal barrier / environmental barrier coatings as 100%, the total HfO2 content in the material is 30%-70%, giving the material a high melting point and ensuring high toughness. Due to the high coefficient of thermal expansion of HfO2 itself, it needs to be combined with SiC and Al6Si2O2. 13 When used with HfSiO4, the above-mentioned components have a lower coefficient of thermal expansion than HfO2 and a higher melting point than Si, so as to have a coefficient of thermal expansion that is compatible with the CMCs substrate while ensuring that the thermal barrier / environmental barrier coating has a high melting point.

[0009] In addition, the adhesive layer material for the thermal barrier / environmental barrier coating according to the above embodiments of the present invention may also have the following additional technical features: In some embodiments of the present invention, x = 0%~30%; and / or y = 10%~40%; z = 10%~40%; and / or, based on the total volume of the environmental barrier coating material, the volume percentage of HfO2 is 30%~70%. Thus, the adhesive layer material for this thermal barrier / environmental barrier coating has the advantages of high melting point, low coefficient of thermal expansion, and high fracture toughness.

[0010] In some embodiments of the present invention, the melting point of the adhesive layer material for the thermal barrier / environmental barrier coating is ≥1500°C. Therefore, the adhesive layer material for the thermal barrier / environmental barrier coating has the advantages of high melting point, low coefficient of thermal expansion, and high fracture toughness.

[0011] In some embodiments of the present invention, the fracture toughness of the adhesive layer material for the thermal barrier / environmental barrier coating is ≥2.0 MPa·m. 1 / 2 Therefore, the adhesive layer material for this thermal barrier / environmental barrier coating has the advantages of high melting point, low coefficient of thermal expansion, and high fracture toughness.

[0012] In some embodiments of the present invention, the coefficient of thermal expansion of the adhesive layer material for the thermal barrier / environmental barrier coating is α, which is 3.0 × 10⁻⁶. -6 K -1 ≤α≤7.0×10 -6 K -1 Therefore, the adhesive layer material for this thermal barrier / environmental barrier coating has the advantages of high melting point, low coefficient of thermal expansion and high fracture toughness.

[0013] In some embodiments of the present invention, the average particle size of the adhesive layer material for the thermal barrier / environmental barrier coating is 30 micrometers to 80 micrometers. Therefore, this adhesive layer material for the thermal barrier / environmental barrier coating has the advantages of a high melting point, a low coefficient of thermal expansion, and high fracture toughness.

[0014] In a second aspect, the present invention provides a method for preparing an adhesive layer material for a thermal barrier / environmental barrier coating as described in the first aspect, comprising: mixing SiC and Al6Si2O... 13 HfSiO4 and HfO2 are mixed and ball-milled in a volume ratio to obtain a precursor mixture; the precursor mixture is ball-milled with a solvent to obtain a mixed slurry; the mixed slurry is spray-granulated, calcined at 1200℃-1350℃, and sieved to obtain a binder material for thermal barrier / environmental barrier coatings.

[0015] Therefore, the adhesive layer material for thermal barrier / environmental barrier coatings prepared by the method proposed in this invention has a stable structure, a high melting point, and excellent thermodynamic properties.

[0016] In a third aspect of the invention, a method for using an adhesive layer material for a thermal barrier / environmental barrier coating as described in the first aspect is provided, comprising: respectively mixing SiC and Al6Si2O... 13 HfSiO4, HfO2, and solvent were ball-milled to obtain corresponding mixed slurries; the mixed slurries were then spray-granulated, calcined at 1350℃-1600℃, and sieved to obtain SiC particles and Al6Si2O4 particles. 13 Particles, HfSiO4 particles, HfO2 particles; SiC particles, Al6Si2O13 Particles, HfSiO4 particles, and HfO2 particles are ball-milled and mixed in a volume ratio to obtain a binder material for thermal barrier / environmental barrier coatings.

[0017] Therefore, the adhesive layer material for thermal barrier / environmental barrier coatings prepared by the method proposed in this invention has a stable structure, a high melting point, and excellent thermodynamic properties.

[0018] In a fourth aspect, the present invention provides a thermal barrier / environmental barrier coating comprising the adhesive layer material for thermal barrier / environmental barrier coatings described in the first aspect of this application. Thus, the thermal barrier / environmental barrier coating possesses the advantages of a high melting point, a low coefficient of thermal expansion, and high fracture toughness.

[0019] In a fifth aspect, the present invention provides an engine comprising the thermal barrier / environmental barrier coating described in the third aspect of the invention. Consequently, the engine has a longer service life.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Detailed Implementation

[0021] The embodiments described below are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] In a first aspect, the present invention provides an adhesive layer material for thermal barrier / environmental barrier coatings, the adhesive layer material comprising: xSiC•yAl6Si2O 13 •zHfSiO4•(1-xyz)HfO2, where x, y and z are volume percentages, x=0%~70%, y=0%~70%, z=0%~70%, and 30%≤x+y+z≤70%.

[0023] For example, the volume percentage x of SiC can be 0%, 10%, 20%, 30%, 40%, 50%, 60%, or 70%, or a range of any two of the above values; according to other embodiments of this application, x = 0%~30%. Al6Si2O 13The volume percentage y can be 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, or any two of the above values; according to some embodiments of this application, y = 10%~40%. The volume percentage z of HfSiO4 can be 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, or any two of the above values; according to some embodiments of this application, z = 10%~40%. x+y+z can be 30%, 40%, 50%, 60%, 70%, or any two of the above values.

[0024] The adhesive layer material for thermal barrier / environmental barrier coatings according to the above embodiments of the present invention is based on HfO2. By introducing a second-phase mullite phase, a third-phase hafnium silicate phase, and a fourth-phase silicon carbide phase, and controlling the composition ratio, the material exhibits a higher melting point and stronger fracture toughness. While increasing the service temperature, it ensures that the material has a coefficient of thermal expansion compatible with the substrate. Specifically, based on the total volume of the adhesive layer material for thermal barrier / environmental barrier coatings (100%), the total HfO2 content in the material is 30%-70%, giving the material a high melting point and ensuring high toughness. Due to the high coefficient of thermal expansion of HfO2 itself, it needs to be combined with SiC and Al6Si2O4. 13 When used with HfSiO4, the above-mentioned components have a lower coefficient of thermal expansion than HfO2 and a higher melting point than Si, so as to have a coefficient of thermal expansion that is compatible with the CMCs substrate while ensuring that the thermal barrier / environmental barrier coating has a high melting point.

[0025] The embodiments of this application do not limit the aggregation state of the adhesive layer material; for example, it can be in block or powder form. The thermal barrier ceramic material of the embodiments of this application can be used to manufacture components for aerospace engines, high-temperature gas turbines, etc., or as a coating for components.

[0026] In some embodiments, the HfO2 site is the main phase, and the doped phase is SiC or Al6Si2O. 13 With at least one of HfSiO4.

[0027] The doped phase can be one, two, or more than two. For example, the doped phase is SiC, or a combination of SiC and Al6Si2O. 13 Or it could be SiC or Al6Si2O 13 With HfSiO4.

[0028] Among them, SiC, Al6Si2O 13 With a lower coefficient of thermal expansion than HfSiO4, the coefficient of thermal expansion of the adhesive layer can be controlled to match the CMCs matrix, and it has a higher melting point than Si.

[0029] In this embodiment, by adjusting the ratio of the main phase HfO2 and the doped phase, the binder material has a higher melting point, while ensuring that the material has higher toughness and is compatible with the CMCs matrix.

[0030] According to an embodiment of the present invention, the melting point of the adhesive layer material for the thermal barrier / environmental barrier coating is ≥1500℃. For example, the melting point can be 1500℃, 1550℃, 1600℃, 1650℃, 1700℃, 1750℃, 1800℃, 1850℃, 1900℃, 1950℃, 2000℃, or any range of two of the above values. Thus, the high melting point of the adhesive layer material for the thermal barrier / environmental barrier coating results in a coating with strong thermal stability, less susceptibility to volume expansion and contraction, and less tendency to peel off, thus providing better protection for the substrate.

[0031] According to an embodiment of the present invention, the fracture toughness of the adhesive layer material for the thermal barrier / environmental barrier coating is ≥2.0 MPa·m. 1 / 2 As an example, the fracture toughness of the adhesive layer material used in thermal barrier / environmental barrier coatings can be 2.0 MPa·m. 1 / 2 2.5 MPa·m 1 / 2 3.0 MPa·m 1 / 2 3.5 MPa·m 1 / 2 4.0 MPa·m 1 / 2 4.5 MPa·m 1 / 2 5.0 MPa·m 1 / 2 5.5 MPa·m 1 / 2 6.0 MPa·m 1 / 2 6.5 MPa·m 1 / 2 7.0 MPa·m 1 / 2 10MPa·m 1 / 2 Or it can be a range of any two of the above values. Therefore, the adhesive layer material used in thermal barrier / environmental barrier coatings has high fracture toughness and strong stability.

[0032] According to an embodiment of the present invention, the coefficient of thermal expansion of the adhesive layer material for the thermal barrier / environmental barrier coating is α, which is 3.0 × 10⁻⁶. -6 K -1 ≤α≤7.0×10 -6 K -1 For example, α could be 3.0 × 10 -6 K -1 4.0×10 -6 K -1 5.0×10 -6 K -1 6.0×10 -6 K -1 7.0×10 -6K -1 The coefficient of thermal expansion of the adhesive layer material for the thermal barrier / environmental barrier coating is controlled within the range of either or any two values. This adhesive layer material for the thermal barrier / environmental barrier coating has a low coefficient of thermal expansion, which can be well matched with the ceramic matrix composite substrate and effectively protect the ceramic matrix composite substrate.

[0033] The coefficient of thermal expansion α of the adhesive layer material used in thermal barrier / environmental barrier coatings can be determined using the following methods: According to the national standard GB / T 16535-2008-Test Method for Linear Thermal Expansion Coefficient of Fine Ceramics - Push Rod Method, the thermal expansion coefficient of the sample was tested using the push rod method, wherein the sample size was 25mm×5mm×5mm.

[0034] According to an embodiment of the present invention, the average particle size of the adhesive layer material for the thermal barrier / environmental barrier coating is 30 micrometers to 80 micrometers. For example, the average particle size of the adhesive layer material for the thermal barrier / environmental barrier coating can be 30 micrometers, 40 micrometers, 50 micrometers, 60 micrometers, 70 micrometers, 80 micrometers, or any two of the above values, thereby facilitating the subsequent preparation of the thermal barrier / environmental barrier coating by thermal spraying.

[0035] In summary, the adhesive layer material for thermal barrier / environmental barrier coatings proposed in this application not only possesses properties such as high melting point, high toughness, and suitable coefficient of thermal expansion, but also represents a significant improvement over traditional Si adhesive layers, indicating that this product has good practicality.

[0036] In a second aspect of the invention, a method for preparing an adhesive layer material for a thermal barrier / environmental barrier coating as described in the first aspect is provided, the method comprising: S1, SiC, Al6Si2O 13 HfSiO4 and HfO2 are mixed in a volume ratio and ball-milled to obtain a precursor mixture; S2. The precursor mixture is ball-milled with a solvent to obtain a mixed slurry; S3. Spray granulation of the mixed slurry, calcination at 1200℃-1350℃, and sieve to obtain the adhesive layer material for thermal barrier / environmental barrier coating.

[0037] As an example, in step S3, the calcination temperature can be 1200℃, 1250℃, 1300℃, 1350℃, or any range of two of the above values.

[0038] It is understandable that when x=0 in the chemical formula of the adhesive layer material used in the thermal barrier / environmental barrier coating, SiC is not added in step S1; when y=0, Al6Si2O is not added in step S1. 13 When z=0, HfSiO4 is not added in step S1.

[0039] The preparation method provided in this application is simple, and the novel adhesive layer material obtained has a high melting point and high toughness.

[0040] In a third aspect of the invention, another method for preparing the adhesive layer material for the thermal barrier / environmental barrier coating described in the first aspect is provided, the method comprising: S01, SiC and Al6Si2O are respectively placed... 13 HfSiO4, HfO2 and solvent were ball-milled to obtain the corresponding mixed slurries; S02. Spray granulation of the mixed slurry, calcination at 1350℃-1600℃, and sieving to obtain SiC particles and Al6Si2O particles. 13 Particles, HfSiO4 particles, HfO2 particles; S03, SiC particles, Al6Si2O 13 Particles, HfSiO4 particles, and HfO2 particles are ball-milled and mixed in a volume ratio to obtain a binder material for thermal barrier / environmental barrier coatings.

[0041] As an example, the calcination temperature in step S02 can be 1350℃, 1400℃, 1450℃, 1500℃, 1550℃, 1600℃ or any range of two of the above values.

[0042] It is understandable that when x=0 in the chemical formula of the adhesive layer material used in the thermal barrier / environmental barrier coating, SiC is not added in steps S01 and S03; when y=0, Al6Si2O is not added in steps S01 and S03. 13 When z=0, HfSiO4 is not added in steps S01 and S03.

[0043] The preparation method provided in this application is simple, and the novel adhesive layer material obtained has a high melting point and high toughness.

[0044] In a fourth aspect, the present invention provides a thermal barrier / environmental barrier coating comprising the adhesive layer material for thermal barrier / environmental barrier coatings described in the first aspect of this application. Thus, this thermal barrier / environmental barrier coating simultaneously possesses the advantages of high melting point, low coefficient of thermal expansion, and high fracture toughness, and can be matched with ceramic matrix composite substrates with low coefficients of thermal expansion.

[0045] According to some embodiments of the present invention, this application provides a thermal barrier / environmental barrier coating, which is formed by granulation and deposition of the thermal barrier / environmental barrier coating adhesive layer material of the first aspect of the present application.

[0046] The binder material for thermal barrier / environmental barrier coatings can be deposited using several techniques. Deposition methods include, but are not limited to, thermal spraying (plasma spraying, flame spraying, and HVOF spraying), sputtering, and electron beam physical vapor deposition (EBPVD).

[0047] In a fifth aspect, the present invention provides an engine comprising the thermal barrier / environmental barrier coating described in the fourth aspect. Thus, the thermal barrier / environmental barrier coating, applied to the ceramic matrix composite material of the engine, effectively protects the ceramic matrix composite material from corrosion and damage, thereby extending the engine's lifespan.

[0048] According to some embodiments of the present invention, the engine includes an aircraft engine.

[0049] The present disclosure will be explained below with reference to embodiments. Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be construed as limiting the scope of the disclosure. Where specific techniques or conditions are not specified in the embodiments, they are performed in accordance with the techniques or conditions described in the literature in the art or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0050] Example 1 (a) The raw material components are SiC and Al6Si2O 13 Calcine HfO2 at 1100℃ for 1-3 hours to remove adsorbed water, carbon dioxide and other impurities; (b) Dry SiC and Al6Si2O 13 Weigh out HfO2 in a specific ratio, and the content is shown in Table 1; (c) The weighed powder is ball-milled and mixed, wherein the ball-milling media are zirconium oxide balls and alcohol, and the ball-milling time is 8 hours.

[0051] (d) Separate the slurry after ball milling, and grind and sieve the obtained blocks; (e) Pass the ball-milled powder from step (d) through a 60-300 mesh sieve, granulate it by spraying, calcine it at 1350-1500℃ for 1-3 hours, and then sieve it to select particles with a size of 30-110 micrometers, which can be used for atmospheric plasma spraying. (f) Using a 15mm diameter mold, pre-press the powder into shape at a pressure of 5-10 kg; use cold isostatic pressing to hold the obtained blank at 200-300MPa for 60-120 seconds. (g) Finally, the sample is fired at 1500-1600 °C for 6-10 hours to obtain a high-density sample, which can be used for performance testing.

[0052] Examples 2-5 The preparation process is similar to that of Example 1, except that the proportion of different types of doped phases is different. The composition of the thermal barrier ceramic materials in Examples 2-5 is shown in Table 1.

[0053] Comparative Example 1 The preparation process is the same as in Example 1, except that only HfO2 is used.

[0054] Comparative Examples 2-3 The preparation process is the same as in Example 1, except that the proportion of different types of doped phases is different. The composition of the thermal barrier ceramic materials in Comparative Examples 2 and 3 is shown in Table 1.

[0055] Testing and Analysis 1. GB / T 16535-2008- Test method for linear thermal expansion coefficient of fine ceramics - push rod method. The push rod method is used to test the thermal expansion coefficient of the sample, wherein the sample size is 25mm×5mm×5mm.

[0056] 2. Determination of fracture toughness: Fracture toughness was measured using the single-sided notched beam (SENB, ASTM C 1421-18) method with a universal testing machine (Instron 5943). The sample size for the SENB test was 2×4×20 mm.

[0057] 3. Melting point determination: The material was melted into spheres using a CO2 laser heater, then cooled and the cooling curves were recorded to study the melting point of the material system.

[0058] Table 1

[0059] As can be seen from the results in Table 1, the adhesive layer material for thermal barrier / environmental barrier coating prepared using the embodiments of the present invention has the advantages of high melting point, low coefficient of thermal expansion, and high fracture toughness.

[0060] Comparative Example 1 uses HfO2, which has a high melting point but an excessively high coefficient of thermal expansion and low fracture toughness. In Comparative Example 2, there is too little HfO2, resulting in low fracture toughness. In Comparative Example 3, there is too much HfO2, resulting in an excessively high coefficient of thermal expansion.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," "some implementations," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0062] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An adhesive layer material for thermal barrier / environmental barrier coatings, characterized in that, The adhesive layer material for the thermal barrier / environmental barrier coating includes: xSiC•yAl6Si2O 13 •zHfSiO4•(1-xyz)HfO2, where x, y and z are volume percentages, x=0%~70%, y=0%~70%, z=0%~70%, and 30%≤x+y+z≤70%.

2. The adhesive layer material for thermal barrier / environmental barrier coatings according to claim 1, characterized in that, x = 0%~30%; and / or, y=10%~40%； z = 10%~40%; and / or, Based on the total volume of the environmental barrier coating material, the volume percentage of HfO2 is 30% to 70%.

3. The adhesive layer material for thermal barrier / environmental barrier coatings according to claim 1, characterized in that, The melting point of the adhesive layer material used for the thermal barrier / environmental barrier coating is ≥1500℃.

4. The adhesive layer material for thermal barrier / environmental barrier coatings according to any one of claims 1 to 3, characterized in that, The fracture toughness of the adhesive layer material used in the thermal barrier / environmental barrier coating is ≥2.0 MPa·m. 1 / 2 .

5. The adhesive layer material for thermal barrier / environmental barrier coatings according to any one of claims 1 to 3, characterized in that, The coefficient of thermal expansion of the adhesive layer material used in the thermal barrier / environmental barrier coating is α, which is 3.0 × 10⁻⁶. -6 K -1 ≤α≤7.0×10 -6 K -1 .

6. The adhesive layer material for thermal barrier / environmental barrier coatings according to any one of claims 1 to 3, characterized in that, The average particle size of the adhesive layer material used in the thermal barrier / environmental barrier coating is 30 micrometers to 80 micrometers.

7. A method for preparing an adhesive layer material for a thermal barrier / environmental barrier coating as described in any one of claims 1-6, characterized in that, include: SiC, Al6Si2O 13 HfSiO4 and HfO2 are mixed in a volume ratio and ball-milled to obtain a precursor mixture; The precursor mixture was ball-milled with a solvent to obtain a mixed slurry; The mixed slurry is spray-granulated, calcined at 1200℃-1350℃, and sieved to obtain a bonding layer material for thermal barrier / environmental barrier coatings.

8. A method for preparing an adhesive layer material for a thermal barrier / environmental barrier coating as described in any one of claims 1-6, characterized in that, include: SiC and Al6Si2O were respectively used 13 HfSiO4, HfO2 and solvent were ball-milled to obtain the corresponding mixed slurries; The mixed slurry was spray-granulated, calcined at 1350℃-1600℃, and sieved to obtain SiC particles and Al6Si2O particles. 13 Particles, HfSiO4 particles, HfO2 particles; SiC particles, Al6Si2O 13 Particles, HfSiO4 particles, and HfO2 particles are ball-milled and mixed in a volume ratio to obtain a binder material for thermal barrier / environmental barrier coatings.

9. A thermal barrier / environmental barrier coating, characterized in that, The thermal barrier / environmental barrier coating comprises the adhesive layer material for the thermal barrier / environmental barrier coating as described in any one of claims 1-6.

10. An engine, characterized in that, The engine includes the thermal barrier / environmental barrier coating as described in claim 9.

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