Preparation method of thermal barrier coating and thermal barrier coating

Abstract

The invention discloses a preparation method of a thermal barrier coating and the thermal barrier coating. The preparation method of the thermal barrier coating comprises the following steps that an original bonding layer is sprayed on the surface of a part base material through atmospheric plasma spraying or hypersonic flame spraying; removing the oxide layer on the surface of the original bonding layer to obtain a modified bonding layer; and a ceramic layer is sprayed on the surface of the modified bonding layer, the thermal barrier coating is obtained, and a compact thermal growth oxide layer is generated on the surface of the modified bonding layer in the service or subsequent heat treatment process of the part base material. According to the method, the surface of the original bonding layer sprayed in an atmosphere plasma spraying mode or a supersonic flame spraying mode is modified, so that the quality of the formed thermal growth oxide layer is improved, and the cycle life of the prepared thermal barrier coating is prolonged with low cost and an easy-to-implement process mode.

Description

Technical Field

[0001] The invention belongs to the technical field of surface modification, and particularly relates to a preparation method of a thermal barrier coating and the thermal barrier coating. Background Art

[0002] With the development of industries such as aerospace and energy, increasingly stringent requirements are being placed on aircraft engines and gas turbines. To enhance the high-temperature resistance of high-temperature components such as turbine blades, turbine guide rings, and combustion chamber components, in addition to upgrading the base metal and improving cooling methods, thermal barrier coatings (TBCs) are often applied to the base metal surface. Currently, the most widely used TBCs consist of a top ceramic layer of partially yttria-doped zirconia (PYSZ) and a bottom bond layer of MCrAlY alloy, where the M in MCrAlY represents Co and / or Ni.

[0003] The bonding layer, made of MCrAlY alloy, exhibits excellent oxidation and corrosion resistance. Specifically, at high temperatures, a thermally grown oxide layer (TGO) forms on the bonding layer's surface. The TGO, composed of aluminum oxide, prevents further oxidation, protecting the base metal. However, if the bonding layer fails, such as excessive TGO thickening or interfacial delamination, the ceramic layer above the bonding layer will fall off, threatening the safety of high-temperature components. Therefore, the design and performance optimization of the bonding layer are key technologies for improving the efficiency of aircraft engines and gas turbines.

[0004] The preparation method of the bonding layer directly affects its oxidation resistance, bonding strength and thermal stress tolerance. In the preparation of thermal barrier coatings on the surfaces of high-temperature components in aircraft engines and gas turbines, the bond layer is typically applied using atmospheric plasma spraying (APS) or supersonic oxygen fuel (HVOF) spraying, which are relatively low-cost and easy to operate. However, during the spraying process, atmospheric plasma spraying and HVOF spraying expose the spray material particles to air, which inevitably causes surface oxidation of the spray material particles. After spraying, an oxide layer forms within and on the surface of the bond layer. The formed oxide layer is relatively loose and not dense, which affects the cycle life of the resulting thermal barrier coating. Vacuum plasma spraying (VPS) or low-pressure plasma spraying (LPPS) are also used in the preparation of bond layers. Due to the vacuum environment of vacuum plasma spraying or the low vacuum environment of low-pressure plasma spraying, surface oxidation of the spray material particles during the spraying process is reduced, thereby reducing surface oxidation of the bond layer after spraying, allowing a denser oxide layer to form on the bond layer surface, thereby improving the cycle life of the resulting thermal barrier coating. However, these methods are relatively more expensive and require more demanding processes.

[0005] In view of the application limitations of vacuum plasma spraying or low-pressure plasma spraying, it is necessary to develop a low-cost method for preparing thermal barrier coatings to improve the cycle life of thermal barrier coatings. Summary of the Invention

[0006] In view of the above-mentioned defects of the prior art, the present invention provides a method for preparing a thermal barrier coating and a thermal barrier coating, by modifying the surface of the original bonding layer sprayed by atmospheric plasma spraying or supersonic flame spraying to improve the quality of the formed thermally grown oxide layer, thereby improving the cycle life of the thermal barrier coating obtained with a low cost and easy-to-implement process.

[0007] The technical solution adopted by the present invention to solve its technical problem is:

[0008] A method for preparing a thermal barrier coating comprises the following steps:

[0009] S1. Spraying the original bonding layer on the surface of the part substrate by atmospheric plasma spraying or supersonic flame spraying;

[0010] S2. removing the oxide layer on the surface of the original bonding layer to obtain a modified bonding layer, wherein the surface cleanliness of the modified bonding layer obtained is consistent with the surface cleanliness of the bonding layer sprayed on the surface of the part substrate by vacuum plasma spraying or low-pressure plasma spraying;

[0011] S3. Spraying a ceramic layer on the surface of the modified bonding layer to obtain a thermal barrier coating, wherein a dense thermally grown oxide layer is generated on the surface of the modified bonding layer during service or subsequent heat treatment of the part substrate, wherein the density of the generated thermally grown oxide layer is consistent with the density of the thermally grown oxide layer generated by the bonding layer obtained by vacuum plasma spraying or low-pressure plasma spraying.

[0012] Furthermore,

[0013] Between step S2 and step S3, the following steps are further included: performing vacuum heat treatment on the modified bonding layer to form a dense prefabricated thermally grown oxide layer on the surface of the modified bonding layer, wherein the density of the prefabricated thermally grown oxide layer formed is consistent with the density of the prefabricated thermally grown oxide layer formed by vacuum heat treatment of the bonding layer obtained by vacuum plasma spraying or low-pressure plasma spraying;

[0014] Step S3 specifically comprises: spraying a ceramic layer on the prefabricated thermally grown oxide layer on the surface of the modified bonding layer to obtain a thermal barrier coating, wherein the prefabricated thermally grown oxide layer on the surface of the modified bonding layer of the part substrate continues to grow during service or subsequent heat treatment and forms a dense thermally grown oxide layer, wherein the density of the generated thermally grown oxide layer is consistent with the density of the thermally grown oxide layer generated by the bonding layer obtained by vacuum plasma spraying or low-pressure plasma spraying.

[0015] Furthermore,

[0016] In step S1: the original bonding layer is composed of a plurality of spraying material particles, and an oxidation layer is formed on the surface of each spraying material particle during the spraying process;

[0017] Step S2 specifically comprises: sandblasting the surface of the original bonding layer with dry ice to remove the oxide layer on the surface of the sprayed material particles on the surface of the original bonding layer; wherein the sandblasting parameters are controlled to prevent the protruding sprayed material particles from falling off from the surface of the original bonding layer, and to ensure that the surface roughness of the obtained modified bonding layer is consistent with the surface roughness of the original bonding layer in step S1, wherein the protruding sprayed material particles are referred to as surface-protruding sprayed material particles.

[0018] Furthermore, in step S2, the sand blasting parameters are specifically as follows: the pressure of the compressed air is controlled at 0.2-0.4 MPa, the particle size of the dry ice is controlled at 0.3-0.5 mm, the dry ice spraying amount is controlled at 50-150 g / min, and the spraying time of the dry ice in a single area is controlled within 2 s.

[0019] Furthermore, in the step between step S2 and step S3, the parameters of the vacuum heat treatment are specifically as follows: the vacuum degree of the heat treatment is ≥0.3 Pa, the heating rate is controlled at 10-25°C / min, the heat treatment temperature is 1080°C±10°C, the holding time is 1h, and the cooling rate is controlled at 20-40°C / min.

[0020] Furthermore,

[0021] In step S1: the original bonding layer is an MCrAlY alloy, wherein M in the MCrAlY alloy represents Co and / or Ni elements;

[0022] In the step between step S2 and step S3: the chemical composition of the prefabricated thermally grown oxide layer is aluminum oxide.

[0023] Furthermore, in step S3: the material of the ceramic layer is partially yttria-doped zirconia; or the ceramic layer is divided into a first layer in contact with the modified bonding layer and a second layer coated on the surface of the first layer, wherein the material of the first layer is partially yttria-doped zirconia, and the material of the second layer is one of rare earth zirconate, rare earth tantalate, hexaaluminate, multi-rare earth-doped zirconia, and fully stabilized yttria-doped zirconia.

[0024] Furthermore, in step S3, a ceramic layer is sprayed on the surface of the modified bonding layer to obtain a thermal barrier coating. Specifically, the ceramic layer is sprayed on the surface of the modified bonding layer by atmospheric plasma spraying or electron beam physical vapor deposition to obtain the thermal barrier coating.

[0025] A thermal barrier coating is prepared using the above-mentioned method for preparing a thermal barrier coating, comprising an original bonding layer sprayed on the surface of a part substrate, wherein an oxide layer on the surface of the original bonding layer is removed to obtain a modified bonding layer, and further comprising a ceramic layer sprayed on the surface of the modified bonding layer.

[0026] Furthermore, the surface of the original bonding layer is treated by dry ice sandblasting to remove the oxide layer on the surface of the sprayed material particles on the surface of the original bonding layer, thereby obtaining a modified bonding layer.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The preparation method of the thermal barrier coating in the present invention comprises the following steps: S1, spraying an original bonding layer on the surface of a part substrate by atmospheric plasma spraying or supersonic flame spraying; S2, removing the oxide layer on the surface of the original bonding layer to obtain a modified bonding layer, wherein the surface cleanliness of the obtained modified bonding layer is consistent with the surface cleanliness of the bonding layer sprayed on the surface of the part substrate by vacuum plasma spraying or low-pressure plasma spraying; S3, spraying a ceramic layer on the surface of the modified bonding layer to obtain a thermal barrier coating, wherein a dense thermally grown oxide layer is generated on the surface of the modified bonding layer during service or subsequent heat treatment of the part substrate, wherein the density of the generated thermally grown oxide layer is consistent with the density of the thermally grown oxide layer generated by the bonding layer obtained by vacuum plasma spraying or low-pressure plasma spraying. In this way, the surface of the original bonding layer sprayed by atmospheric plasma spraying or supersonic flame spraying is modified and the oxide layer on the surface of the original bonding layer is removed, so that the surface cleanliness of the modified bonding layer is consistent with the surface cleanliness of the bonding layer sprayed on the surface of the part substrate by vacuum plasma spraying or low-pressure plasma spraying. Then, a dense thermally grown oxide layer will be generated on the surface of the modified bonding layer during service or subsequent heat treatment of the part substrate, wherein the density of the generated thermally grown oxide layer is consistent with the density of the thermally grown oxide layer generated by the bonding layer obtained by vacuum plasma spraying or low-pressure plasma spraying, thereby improving the quality of the generated thermally grown oxide layer, and thus can improve the cycle life of the thermal barrier coating obtained at a lower cost and in an easily implemented process.

[0029] In the present invention, the following step is further included between step S2 and step S3: vacuum heat treatment of the modified bonding layer to form a dense prefabricated thermally grown oxide layer on the surface of the modified bonding layer, wherein the density of the prefabricated thermally grown oxide layer is consistent with the density of the prefabricated thermally grown oxide layer formed by vacuum heat treatment of the bonding layer obtained by vacuum plasma spraying or low-pressure plasma spraying; in this way, by vacuum heat treatment of the modified bonding layer to form the prefabricated thermally grown oxide layer, the density of the prefabricated thermally grown oxide layer is consistent with the density of the thermally grown oxide layer formed by vacuum heat treatment of the bonding layer obtained by vacuum plasma spraying or low-pressure plasma spraying, thereby improving the quality of the prefabricated thermally grown oxide layer. In addition, this step can not only form a dense prefabricated thermally grown oxide layer on the surface of the modified bonding layer to improve the cyclic performance of the subsequent thermal barrier coating, but also complete certain steps of the heat treatment of the high-temperature alloy component substrate to improve the performance of the component substrate. In addition, it can also strengthen the mutual diffusion between the modified bonding layer and the component substrate to improve the bonding strength between the modified bonding layer and the component substrate.

[0030] In the present invention, the specific sandblasting parameters are: compressed air pressure controlled at 0.2-0.4 MPa, dry ice particle size controlled at 0.3-0.5 mm, dry ice spray rate controlled at 50-150 g / min, and dry ice spray time in a single area controlled within 2 seconds. By setting these sandblasting parameters, protruding sprayed material particles are prevented from falling off the original bonding layer, and the surface roughness of the resulting modified bonding layer is maintained consistent with the surface roughness of the original bonding layer in step S1.

[0031] In summary, the preparation method of the thermal barrier coating in the present invention is based on the existing process sequence, has low cost, is easy to implement, and has significant effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the structure of the thermal barrier coating of the present invention;

[0033] Figure 2 Schematic diagram of the structure of the original bonding layer composed of multiple spray material particles.

[0034] Explanation of the reference numerals in the figure: 1. Part substrate, 2. Original bonding layer, 201. Spraying material particles, 202. Surface protruding spraying material particles, 203. Oxide layer, 3. Modified bonding layer, 4. Ceramic layer. DETAILED DESCRIPTION

[0035] The following is a further detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, and are not intended to limit the present invention.

[0036] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0037] A method for preparing a thermal barrier coating comprises the following steps:

[0038] S1. Spraying an original bonding layer 2 on the surface of a part substrate 1 by atmospheric plasma spraying or supersonic flame spraying;

[0039] S2. Removing the oxide layer 203 on the surface of the original bonding layer 2 to obtain a modified bonding layer 3, wherein the surface cleanliness of the modified bonding layer 3 obtained is consistent with the surface cleanliness of the bonding layer sprayed on the surface of the part substrate 1 by vacuum plasma spraying or low-pressure plasma spraying;

[0040] S3, spraying a ceramic layer 4 on the surface of the modified bonding layer 3 to obtain a thermal barrier coating, see Figure 1 , wherein a dense thermally grown oxide layer is formed on the surface of the modified bonding layer 3 of the part substrate 1 during service or subsequent heat treatment, wherein the density of the generated thermally grown oxide layer is consistent with the density of the thermally grown oxide layer generated by the bonding layer obtained by vacuum plasma spraying or low-pressure plasma spraying.

[0041] In this way, the surface of the original bonding layer 2 sprayed by atmospheric plasma spraying or supersonic flame spraying is improved, and the oxide layer 203 on the surface of the original bonding layer 2 is removed, so that the surface cleanliness of the obtained modified bonding layer 3 is consistent with the surface cleanliness of the bonding layer sprayed on the surface of the part substrate 1 by vacuum plasma spraying or low-pressure plasma spraying. Then, a dense thermally grown oxide layer will be generated on the surface of the modified bonding layer 3 during service or subsequent heat treatment of the part substrate 1, wherein the density of the generated thermally grown oxide layer is consistent with the density of the thermally grown oxide layer generated by the bonding layer obtained by vacuum plasma spraying or low-pressure plasma spraying, thereby improving the quality of the generated thermally grown oxide layer, and therefore can improve the cycle life of the thermal barrier coating obtained at a lower cost and in an easily implemented process.

[0042] In one embodiment,

[0043] Between step S2 and step S3, the following steps are also included: vacuum heat treatment is performed on the modified bonding layer 3 to generate a dense prefabricated thermally grown oxide layer on the surface of the modified bonding layer 3, wherein the density of the generated prefabricated thermally grown oxide layer is consistent with the density of the prefabricated thermally grown oxide layer generated by vacuum heat treatment of the bonding layer obtained by vacuum plasma spraying or low-pressure plasma spraying; in this way, by vacuum heat treatment of the modified bonding layer 3 to generate the prefabricated thermally grown oxide layer, the density of the obtained prefabricated thermally grown oxide layer is consistent with the density of the prefabricated thermally grown oxide layer generated by vacuum plasma spraying or low-pressure plasma spraying. The density of the thermally grown oxide layer obtained by vacuum heat treatment of the bonding layer obtained by high-pressure plasma spraying is consistent, thereby improving the quality of the generated prefabricated thermally grown oxide layer. In addition to generating a dense prefabricated thermally grown oxide layer on the surface of the modified bonding layer 3 to improve the subsequent cycle performance of the thermal barrier coating, this step can also complete certain sequences of heat treatment of the high-temperature alloy part substrate 1 to improve the performance of the part substrate 1. In addition, it can also strengthen the mutual diffusion between the modified bonding layer 3 and the part substrate 1 to improve the bonding force between the modified bonding layer 3 and the part substrate 1.

[0044] Step S3 is specifically as follows: spraying a ceramic layer 4 on the prefabricated thermally grown oxide layer on the surface of the modified bonding layer 3 to obtain a thermal barrier coating, wherein the prefabricated thermally grown oxide layer on the surface of the modified bonding layer 3 of the part substrate 1 continues to grow during service or subsequent heat treatment and forms a dense thermally grown oxide layer, wherein the density of the generated thermally grown oxide layer is consistent with the density of the thermally grown oxide layer generated by the bonding layer obtained by vacuum plasma spraying or low-pressure plasma spraying.

[0045] The vacuum heat treatment parameters between step S2 and step S3 are as follows: a vacuum degree of ≥ 0.3 Pa, a heating rate of 10-25°C / min, a heat treatment temperature of 1080°C ± 10°C, a holding time of 1 hour, and a cooling rate of 20-40°C / min. This ensures the density of the prefabricated thermally grown oxide layer.

[0046] in,

[0047] In step S1: the original bonding layer 2 is an MCrAlY alloy, wherein M in the MCrAlY alloy represents Co and / or Ni elements;

[0048] In the step between step S2 and step S3: the chemical composition of the prefabricated thermally grown oxide layer is aluminum oxide.

[0049] In one embodiment,

[0050] In step S1: the original bonding layer 2 is composed of a plurality of spraying material particles 201. During the spraying process, an oxide layer 203 is formed on the surface of each spraying material particle 201. Figure 2 ;

[0051] Step S2 specifically includes: performing sandblasting treatment on the surface of the original bonding layer 2 using dry ice to remove the oxide layer 203 on the surface of the sprayed material particles 201 on the surface of the original bonding layer 2 .

[0052] In step S2, the sandblasting parameters are controlled to prevent the protruding spraying material particles 201 from falling off the surface of the original bonding layer 2, and the surface roughness of the modified bonding layer 3 is kept consistent with the surface roughness of the original bonding layer 2 in step S1. The protruding spraying material particles 201 are referred to as protruding spraying material particles 202. Figure 2 , wherein the introduction of impurities should be avoided during the sand blasting process, and therefore appropriate sand blasting particles need to be selected. Preferably, in step S2, the sand blasting parameters are specifically as follows: the pressure of the compressed air is controlled at 0.2-0.4 MPa, the particle size of the dry ice is controlled at 0.3-0.5 mm, the dry ice spraying amount is controlled at 50-150 g / min, and the dry ice spraying time of a single area is controlled within 2 seconds. In this way, by setting the above-mentioned sand blasting parameters, it is possible to prevent the protruding spraying material particles 201 from falling off the surface of the original bonding layer 2, and to ensure that the surface roughness of the resulting modified bonding layer 3 is consistent with the surface roughness of the original bonding layer 2 in step S1.

[0053] In one embodiment, in step S3: the material of the ceramic layer 4 is partially yttria-doped zirconia; or the ceramic layer 4 is divided into a first layer in contact with the modified bonding layer 3 and a second layer coated on the surface of the first layer, wherein the material of the first layer is partially yttria-doped zirconia, and the material of the second layer is one of rare earth zirconate, rare earth tantalate, hexaaluminate, multi-rare earth-doped zirconia, and fully stabilized yttria-doped zirconia.

[0054] In one embodiment, in step S3, a ceramic layer 4 is sprayed on the surface of the modified bonding layer 3 to obtain a thermal barrier coating. Specifically, the ceramic layer 4 is sprayed on the surface of the modified bonding layer 3 by atmospheric plasma spraying or electron beam physical vapor deposition to obtain a thermal barrier coating.

[0055] A thermal barrier coating is prepared by the above-mentioned preparation method of the thermal barrier coating, comprising an original bonding layer 2 sprayed on the surface of a component substrate 1, wherein the oxide layer 203 on the surface of the original bonding layer 2 is removed to obtain a modified bonding layer 3, and further comprising a ceramic layer 4 sprayed on the surface of the modified bonding layer 3. Figure 1 In some cases, according to process requirements, a prefabricated thermally grown oxide layer is also grown on the surface of the modified bonding layer 3, and the ceramic layer 4 is sprayed on the prefabricated thermally grown oxide layer.

[0056] In the actual cyclic oxidation test, the original bonding layer 2 is first directly subjected to vacuum heat treatment using the steps between step S2 and step S3 of the present invention, and then the ceramic layer 4 is sprayed to obtain a comparative sample piece, wherein the diameter of the comparative sample piece is 25 mm and the thickness is 5 mm, and the comparative sample piece is subjected to a cyclic test, wherein the test conditions of each cycle during the cyclic test are: keeping warm at 1100°C for 35 minutes, then taking out of the furnace and cooling, and cooling from 1100°C to below 50°C, so that the average cycle life of the comparative sample piece in the cyclic test is 337 times; then the embodiment sample prepared by using step S2, the steps between step S2 and step S3, and step S3 of the present invention is subjected to a cyclic test, wherein the test conditions of each cycle during the cyclic test are the same as the test conditions of each cycle when the comparative sample piece is cyclically tested, so that the average cycle life of the embodiment sample in the cyclic test is increased to more than 500 times, the cycle life is increased by 48%, and the cyclic oxidation life is greatly improved.

[0057] In summary, the present invention has developed a low-cost method for preparing thermal barrier coatings based on atmospheric plasma spraying or supersonic flame spraying technology, which achieves the spraying effect of vacuum plasma spraying or low-pressure plasma spraying and improves the cycle life of the thermal barrier coating.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a thermal barrier coating, characterized in that: The following steps are involved: S1. Spraying an original bonding layer (2) on the surface of a component substrate (1) by atmospheric plasma spraying or supersonic flame spraying; S2, removing the oxide layer (203) on the surface of the original bonding layer (2) to obtain a modified bonding layer (3), wherein the surface cleanliness of the obtained modified bonding layer (3) is consistent with the surface cleanliness of the bonding layer sprayed on the surface of the part substrate (1) by vacuum plasma spraying or low-pressure plasma spraying; S3. Spraying a ceramic layer (4) on the surface of the modified bonding layer (3) to obtain a thermal barrier coating, wherein a dense thermally grown oxide layer is generated on the surface of the modified bonding layer (3) of the part substrate (1) during service or subsequent heat treatment, wherein the density of the generated thermally grown oxide layer is consistent with the density of the thermally grown oxide layer generated by the bonding layer obtained by vacuum plasma spraying or low-pressure plasma spraying.

2. The method for preparing a thermal barrier coating according to claim 1, wherein: Between step S2 and step S3, the following steps are also included: vacuum heat treatment is performed on the modified bonding layer (3) to generate a dense prefabricated thermally grown oxide layer on the surface of the modified bonding layer (3), wherein the density of the generated prefabricated thermally grown oxide layer is consistent with the density of the prefabricated thermally grown oxide layer generated by vacuum heat treatment of the bonding layer obtained by vacuum plasma spraying or low-pressure plasma spraying; Step S3 specifically comprises: spraying a ceramic layer (4) on the prefabricated thermally grown oxide layer on the surface of the modified bonding layer (3) to obtain a thermal barrier coating, wherein the prefabricated thermally grown oxide layer on the surface of the modified bonding layer (3) of the part substrate (1) continues to grow during service or subsequent heat treatment and forms a dense thermally grown oxide layer, wherein the density of the generated thermally grown oxide layer is consistent with the density of the thermally grown oxide layer generated by the bonding layer obtained by vacuum plasma spraying or low-pressure plasma spraying.

3. The method for preparing a thermal barrier coating according to claim 1, wherein: In step S1: the original bonding layer (2) is composed of a plurality of spraying material particles (201), and an oxide layer (203) is formed on the surface of each spraying material particle (201) during the spraying process; Step S2 specifically comprises: sandblasting the surface of the original bonding layer (2) with dry ice to remove the oxide layer (203) on the surface of the spraying material particles (201) on the surface of the original bonding layer (2); wherein the sandblasting parameters are controlled to prevent the spraying material particles (201) protruding from the surface from falling off from the surface of the original bonding layer (2), and to ensure that the surface roughness of the obtained modified bonding layer (3) is consistent with the surface roughness of the original bonding layer (2) in step S1, wherein the spraying material particles (201) protruding from the surface are referred to as surface-protruding spraying material particles (202).

4. The method for preparing a thermal barrier coating according to claim 3, wherein: In step S2, the sand blowing parameters are as follows: the compressed air pressure is controlled at 0.2-0.4 MPa, the dry ice particle size is controlled at 0.3-0.5 mm, the dry ice spraying volume is controlled at 50-150 g / min, and the dry ice spraying time of a single area is controlled within 2 seconds.

5. The method for preparing a thermal barrier coating according to claim 2, wherein: In the step between step S2 and step S3, the parameters of the vacuum heat treatment are specifically as follows: the vacuum degree of the heat treatment is ≥0.3Pa, the heating rate is controlled at 10-25℃ / min, the heat treatment temperature is 1080℃±10℃, the holding time is 1h, and the cooling rate is controlled at 20-40℃ / min.

6. The method for preparing a thermal barrier coating according to claim 2, wherein: In step S1: the original bonding layer (2) is an MCrAlY alloy, wherein M in the MCrAlY alloy represents Co and / or Ni elements; In the step between step S2 and step S3: the chemical composition of the prefabricated thermally grown oxide layer is aluminum oxide.

7. The method for preparing a thermal barrier coating according to claim 1, characterized in that: In step S3: the material of the ceramic layer (4) is partially yttria-doped zirconia; or the ceramic layer (4) is divided into a first layer in contact with the modified bonding layer (3) and a second layer coated on the surface of the first layer, wherein the material of the first layer is partially yttria-doped zirconia, and the material of the second layer is one of rare earth zirconate, rare earth tantalate, hexaaluminate, multi-rare earth-doped zirconia, and fully stabilized yttria-doped zirconia.

8. The method for preparing a thermal barrier coating according to claim 1, wherein: In step S3, a ceramic layer (4) is sprayed on the surface of the modified bonding layer (3) to obtain a thermal barrier coating, specifically: the ceramic layer (4) is sprayed on the surface of the modified bonding layer (3) by atmospheric plasma spraying or electron beam physical vapor deposition to obtain a thermal barrier coating.

9. A thermal barrier coating, prepared by the method for preparing a thermal barrier coating according to any one of claims 1 to 8, characterized in that: The invention comprises an original bonding layer (2) sprayed on the surface of a component substrate (1), wherein an oxide layer (203) on the surface of the original bonding layer (2) is removed to obtain a modified bonding layer (3), and further comprises a ceramic layer (4) sprayed on the surface of the modified bonding layer (3).

10. The thermal barrier coating according to claim 9, characterized in that: The surface of the original bonding layer (2) is subjected to dry ice sandblasting treatment to remove the oxide layer (203) on the surface of the sprayed material particles (201) on the surface of the original bonding layer (2), thereby obtaining a modified bonding layer (3).

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