An antioxidant coating, a preparation method thereof, a high-temperature component, and an aviation device

Abstract

The present application provides an antioxidant coating, a preparation method thereof, a high-temperature component, and an aviation device, relating to the technical field of coatings. The antioxidant coating includes a first coating and a second coating which are sequentially stacked; the first coating includes one or more of an MCrAlY layer, a Ni-Al layer, and a Pt-Al layer, wherein M includes Co or / and Ni; the second coating includes a nano Al-Al2O3 layer. The antioxidant coating provided by the present application has excellent antioxidant performance and a fast oxidation desorption time, which can effectively extend the service life of the antioxidant coating and reduce the risk of failure of the antioxidant coating.

Description

Technical Field

[0001] The present application relates to the technical field of coatings, and particularly relates to an antioxidant coating, a preparation method thereof, a high-temperature component and an aviation device. Background Art

[0002] With the development of aviation devices such as aeroengines and gas turbines, high-temperature components face serious oxidation problems during production and operation.

[0003] To solve this problem, researchers improve the oxidation resistance of the substrate by setting aluminide coatings such as MCrAlY coatings, Ni-Al coatings or Pt-Al coatings. The oxidation resistance principle of these coatings is to form a dense Al2O3 protective film (TGO) at high temperatures, thereby reducing the oxygen diffusion rate to play an antioxidant role. However, when these coatings are used above 1100 °C, due to the too-fast growth of TGO, wrinkles and thermal stress mismatch are caused, so they are prone to spalling, and their oxidation resistance is greatly weakened.

[0004] In recent years, magnetron sputtering technology has made remarkable progress in the field of material preparation. Especially in the preparation of coatings, magnetron sputtering is a process that uses a magnetic field to control the movement of sputtered particles, and has characteristics such as a high sputtering rate, good deposition uniformity and low energy consumption. However, the traditional magnetron sputtering process is usually carried out in a high-vacuum environment to reduce the influence of oxygen on the deposited coating.

[0005] Therefore, it is of great significance to develop a new type of antioxidant coating. Summary of the Invention

[0006] The purpose of the present application is to provide an antioxidant coating, a preparation method thereof, a high-temperature component and an aviation device to solve the above problems.

[0007] To achieve the above purpose, in the first aspect of the present application, an antioxidant coating is provided, including a first coating and a second coating which are sequentially stacked;

[0008] The first coating includes one or more of an MCrAlY layer, a Ni-Al layer, and a Pt-Al layer, wherein M includes Co or / and Ni;

[0009] The second coating includes a nano Al-Al2O3 layer.

[0010] Optionally, the antioxidant coating satisfies at least one of the following conditions:

[0011] A. The thickness of the first coating is 30 μm - 200 μm;

[0012] B. The thickness of the second coating is 200 nm - 1000 nm.

[0013] Optionally, the molar ratio of Al to Al2O3 in the nano Al-Al2O3 layer is 1:0.9 - 1.5.

[0014] The second aspect of the present application provides a method for preparing the antioxidant coating, including:

[0015] A first coating is provided on the surface of the substrate by thermal spraying or / and aluminizing.

[0016] In a vacuum environment, the surface of the first coating is magnetron sputtered to provide a second coating, obtaining the antioxidant coating.

[0017] Optionally, the vacuum degree of the vacuum environment is 2×10 -1 Pa - 9.3×10 -2 Pa.

[0018] Optionally, the method for preparing the antioxidant coating satisfies at least one of the following conditions:

[0019] A. The temperature of the substrate and the first coating during the magnetron sputtering is 350°C - 550°C;

[0020] B. The carrier gas flow rates of argon and nitrogen during the magnetron sputtering are each independently 150 mL / min - 600 mL / min;

[0021] C. The bias voltage during the magnetron sputtering is 200 V - 800 V;

[0022] D. The duty cycle during the magnetron sputtering is 15% - 45%.

[0023] Optionally, it further includes: cooling the substrate, the first coating, and the second coating after the magnetron sputtering, and performing pre-oxidation treatment in an atmospheric environment.

[0024] Optionally, the temperature of the pre-oxidation treatment is 750°C - 900°C, and the time is 2 h - 8 h.

[0025] The third aspect of the present application provides a high-temperature component, including a substrate and an antioxidant coating provided on the surface of the substrate;

[0026] The antioxidant coating includes the antioxidant coating or the antioxidant coating prepared by the method for preparing the antioxidant coating;

[0027] The substrate includes nickel-based superalloy and / or single-crystal superalloy.

[0028] The fourth aspect of the present application provides an aviation device, including the high-temperature component.

[0029] Compared with the prior art, the beneficial effects of the present application include:

[0030] For the antioxidant coating provided by the present application, a layer of Al / Al2O3 nano-layer is provided on the surface of the first coating such as the MCrAlY antioxidant layer or / and the aluminide antioxidant layer. The Al / Al2O3 nano-layer can quickly get out of the competitive oxidation stage in the initial stage at high temperature (above 900°C), reduce the accumulation of oxides, thereby shortening the oxidation desorption time, and finally form an ordered alumina crystal. This ordered alumina layer can effectively inhibit further oxidation, thereby improving the antioxidant performance of the coating. Among them, the formation of the alumina crystal is divided into a nucleation stage and a growth stage. The Al / Al2O3 nano second coating provides nucleation for the dense and ordered α-Al2O3, enabling it to skip the nucleation stage and directly enter the growth stage when forming, so the crystal can be quickly ordered. And because the second coating is deposited, nucleation is provided for α-Al2O3, so it directly enters the growth stage of α-Al2O3, and almost no other oxides will appear. The antioxidant coating provided by the present application has excellent antioxidant performance and fast oxidation film densification time, which can effectively extend the service life of the antioxidant coating and reduce the risk of antioxidant coating failure.

[0031] For the preparation method of the antioxidant coating provided by the present application, surface activation of the antioxidant coating is achieved through magnetron sputtering treatment. This method not only can improve the antioxidant performance of the coating, but also has advantages such as low energy consumption and good deposition uniformity, providing a new solution for the antioxidant treatment of high-temperature components.

[0032] The high-temperature component provided by the present application has strong antioxidant ability and can extend the service life in a high-temperature environment.

[0033] The aviation equipment provided by the present application has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope of the present application.

[0035] Figure 1 It is a comparison diagram of the initial oxidation stage and the late oxidation stage of the aluminide coating forming the TGO protective film in the prior art;

[0036] Figure 2 It is a comparison diagram of the initial oxidation stage and the late oxidation stage of the antioxidant coating provided by the present application forming the TGO protective film;

[0037] Figure 3 It is a scanning electron microscope image of the second coating prepared in Example 1 without oxidation;

[0038] Figure 4 Scanning electron microscope image of the second coating prepared in Example 2 after oxidation;

[0039] Figure 5 Scanning electron microscope image of the coating prepared in Comparative Example 1 after oxidation;

[0040] Figure 6 Schematic diagram of the principle of the oxidation weight gain curves of the antioxidant coating of Example 1 and the coating of Comparative Example 1;

[0041] Figure 7 Test chart of the oxidation weight gain curves of the antioxidant coatings of Example 1 and Example 2 and the coatings of Comparative Example 1 and Comparative Example 2. Detailed implementation manners

[0042] As used herein, the terms:

[0043] "Prepared from" is synonymous with "comprising". As used herein, the terms "comprising", "including", "having", "containing" or any other variation thereof are intended to cover non-exclusive inclusion. For example, a composition, step, method, article or device containing the listed elements is not necessarily limited to those elements, but may include other elements not expressly listed or elements inherent to such composition, step, method, article or device.

[0044] The connecting phrase "consisting of" excludes any unstated element, step or component. If used in a claim, this phrase will render the claim closed, excluding materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause of the claim body rather than immediately following the subject, it only limits the elements described in that clause; other elements are not excluded from the claim as a whole.

[0045] When an equivalent, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values and lower preferred values, this should be understood to specifically disclose all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the ranges are disclosed individually. For example, when the range "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described herein, unless otherwise stated, the range is intended to include its end values and all integers and fractions within the range.

[0046] In these examples, unless otherwise specified, the parts and percentages are by mass.

[0047] "Parts by mass" refers to the basic measurement unit representing the mass ratio relationship of multiple components. 1 part can represent any unit mass, such as 1 g or 2.689 g, etc. If we say that the mass of component A is a parts by mass and the mass of component B is b parts by mass, it means the mass ratio of component A to component B is a:b. Or it means the mass of component A is aK and the mass of component B is bK (K is an arbitrary number representing a multiple factor). It should not be misunderstood that, different from the number of parts by mass, the sum of the parts by mass of all components is not limited to 100 parts.

[0048] "And / or" is used to indicate that one or both of the described situations may occur. For example, A and / or B includes (A and B) and (A or B).

[0049] The first aspect of the present application provides an antioxidant coating, comprising a first coating and a second coating stacked in sequence;

[0050] The first coating includes one or more of MCrAlY layer, Ni-Al layer, and Pt-Al layer, wherein M includes Co or / and Ni;

[0051] The second coating includes a nano Al-Al2O3 layer.

[0052] It should be noted that aluminide coatings such as MCrAlY coatings, Ni-Al coatings, or Pt-Al coatings in the prior art are known to form a dense TGO protective film at high temperatures. The main component of this TGO protective film is Al2O3, and there are also some components that are oxides formed by other metals in the aluminide coating. The entire process of forming the TGO protective film includes the initial oxidation stage (left figure) and the late oxidation stage (right figure), as Figure 1 shown, at the initial oxidation stage, some spinel particles are distributed on the outermost surface of the aluminide coating, and then the TGO protective film is gradually formed. The film of this TGO protective film is relatively thick. Generally, when the TGO thickness > 8 μm, there is a risk of peeling. When the TGO peels off, the inward diffusion of oxygen will accelerate, thereby reducing the oxidation resistance.

[0053] However, for the antioxidant coating provided by the present application, a dense TGO protective film will also be formed at high temperatures, but the component in this TGO protective film is only Al2O3, as Figure 2 shown, no spinel particles are distributed in both the initial oxidation stage (left figure) and the late oxidation stage (right figure). The thickness of this TGO protective film is thin and there is no risk of peeling, and it can continue to provide protection.

[0054] In the prior art, the reason why the TGO protective film is thick and has some spinel particles distributed is that, when Al element is oxidized and nucleated simultaneously with elements such as Ni, Co, and Cr, they are in a competitive relationship, and disordered θ-Al2O3, chromium oxide, and Ni and Co spinels (or oxides) are respectively formed. As oxidation proceeds, the growth stage of Al2O3 has an obvious advantage over other oxides, so the TGO layer composed of Al2O3 begins to form. During this process, Al2O3 also transforms from loose and disordered θ-Al2O3 to dense and ordered α-Al2O3. However, other oxides formed in the initial stage of oxidation still exist in the TGO, and at the same time, due to the disorder of the competitive oxidation in the initial stage of oxidation, its volume is large, resulting in the overall thickness of the TGO film layer being relatively thick; while in this application, directly entering the growth stage of α-Al2O3 in the initial stage of oxidation, almost no other oxides will appear, so the TGO film layer is thin.

[0055] It should be noted that the dense and ordered α-Al2O3 in Al2O3 is the key to playing the antioxidant role. Due to its density, it hinders the inward diffusion of oxygen element, thus improving the antioxidant property.

[0056] In some embodiments, the antioxidant coating satisfies at least one of the following conditions:

[0057] A. The thickness of the first coating is 30μm - 200μm;

[0058] Optionally, the thickness of the first coating can be 30μm, 60μm, 90μm, 120μm, 150μm, 180μm, 200μm or any value between 30μm - 200μm;

[0059] B. The thickness of the second coating is 200nm - 1000nm.

[0060] Optionally, the thickness of the second coating can be 200nm, 600nm, 800nm, 1000nm or any value between 200nm - 1000nm.

[0061] It should be noted that when the thickness of the second coating is higher than 1000nm, the second coating is prone to peeling, and when it is lower than 200nm, the function of the second coating in providing nucleation is not obvious.

[0062] In some embodiments, the molar ratio of Al to Al2O3 in the nano Al-Al2O3 layer is 1:0.9 - 1.5.

[0063] Optionally, the molar ratio of Al to Al2O3 in the nano Al-Al2O3 layer can be 1:0.9, 1:1.0, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5 or any value between 1:0.9 - 1.5.

[0064] It should be noted that when the molar ratio of Al to Al2O3 in the nano-Al-Al2O3 layer is 1:0.9 - 1.5, if the Al content is too high, during the subsequent oxidation process, unstable needle-like θ-Al2O3 needs to be formed first and then transformed into dense α-Al2O3. In this case, the morphology of the coating layer is not good and the improvement of oxidation resistance is not obvious. If the Al2O3 content is too high, the thermal stress difference from the substrate is too large and it is easy to peel off.

[0065] The second aspect of this application provides a method for preparing the antioxidant coating, including:

[0066] Adopting thermal spraying method or / and aluminizing method to set a first coating on the surface of the substrate;

[0067] In some embodiments, an MCrAlY layer is set by thermal spraying method, and a Ni-Al layer and / or Pt-Al layer are set by aluminizing method. Exemplarily, the thermal spraying method includes flame spraying method and / or plasma spraying method, and the aluminizing method includes vacuum aluminizing and / or gas aluminizing;

[0068] The first coating is a general antioxidant coating;

[0069] In a vacuum environment, magnetron sputtering is carried out on the surface of the first coating to set a second coating, obtaining the antioxidant coating.

[0070] In some embodiments, the vacuum degree of the vacuum environment is 2×10 -1 Pa - 9.3×10 -2 Pa.

[0071] Optionally, the vacuum degree of the vacuum environment can be any value between 2×10 -1 Pa, 1×10 -1 Pa, 9.5×10 -2 Pa, 9.3×10 -2 Pa or 2×10 -1 Pa - 9.3×10 -2 Pa.

[0072] It should be noted that the conventional requirement for vacuum degree is 5×10 -3 Pa, while in this application, the vacuum degree is controlled between 2×10 - 1 Pa - 9.3×10 -2 Pa, aiming to leave a part of trace air. The oxygen in it can make Al2O3 generated during magnetron sputtering. If the vacuum degree is greater than 2×10 -1 Pa, the Al2O3 of the second coating is too high. If the vacuum degree is less than 9.3×10 -2 Pa, the Al content is too high.

[0073] C. The bias voltage during the magnetron sputtering process is 200V - 800V;

[0074] Optionally, the bias voltage during the magnetron sputtering process is 200V, 400V, 600V, 800V or any value between 200V - 800V;

[0075] D. The duty cycle during the magnetron sputtering process is 15% - 45%.

[0076] Optionally, the duty cycle during the magnetron sputtering process can be 15%, 25%, 35%, 45% or any value between 15% - 45%.

[0077] It should be noted that when the bias voltage is in the range of 200V - 800V and the duty cycle is in the range of 15% - 45%, it helps to quickly form a thin film and improve the density of the film layer. When the bias voltage is too high and the duty cycle is too large, gas ions will accumulate on the substrate, which will instead reduce the deposition efficiency of Al elements. When the bias voltage is too low and the duty cycle is too low, no obvious effect can be achieved.

[0078] In some embodiments, the voltage during the magnetron sputtering process is 200V - 550V and the current is 0.2A - 0.5A.

[0079] Within this range, it can ensure stable glow discharge and deposition during the magnetron sputtering process.

[0080] In some embodiments, the preparation method of the antioxidant coating satisfies at least one of the following conditions:

[0081] A. The temperatures of the substrate and the first coating during the magnetron sputtering are 350°C - 550°C;

[0082] Optionally, the temperatures of the substrate and the first coating during the magnetron sputtering can be 350°C, 400°C, 450°C, 500°C, 550°C or any value between 350°C - 550°C.

[0083] B. The carrier gas flow rate of argon or nitrogen during the magnetron sputtering process is 150mL / min - 600mL / min.

[0084] Optionally, the carrier gas flow rates of argon or nitrogen during the magnetron sputtering process can each independently be 150mL / min, 200mL / min, 300mL / min, 400mL / min, 500mL / min, 600mL / min or any value between 150mL / min - 600mL / min.

[0085] In some embodiments, it further includes: cooling the substrate, the first coating and the second coating after the magnetron sputtering, and performing a pre-oxidation treatment in an atmospheric environment.

[0086] It should be noted that during the pre-oxidation process, the second coating is completely converted into nano-scale TGO of α-Al2O3, which can slightly improve the oxidation resistance. This pre-oxidation process is carried out at a temperature above 750°C. Al in the second coating and Al in the first coating diffuse and transform together, so the bonding property is better and it will not peel off.

[0087] In some embodiments, the temperature of the pre-oxidation treatment is 750°C - 900°C, and the time is 2h - 8h.

[0088] Optionally, the temperature of the pre-oxidation treatment can be 750°C, 800°C, 850°C, 900°C or any value between 750°C - 900°C, and the time can be 2h, 4h, 6h, 8h or any value between 2h - 8h.

[0089] The third aspect of the present application provides a high-temperature component, including a substrate and an oxidation-resistant coating provided on the surface of the substrate;

[0090] The oxidation-resistant coating includes the oxidation-resistant coating described above or the oxidation-resistant coating prepared by the preparation method of the oxidation-resistant coating described above;

[0091] The substrate includes nickel-based superalloy and / or single-crystal superalloy.

[0092] It should be noted that the high-temperature components include but are not limited to one or more of turbine blades, combustion chambers, and working blades.

[0093] The fourth aspect of the present application provides an aviation device, including the high-temperature component described above.

[0094] It should be noted that the aviation devices include but are not limited to aviation engines and gas turbines.

[0095] Hereinafter, specific embodiments will be used to describe the implementation scheme of the present application in detail. However, those skilled in the art will understand that the following embodiments are only used to illustrate the present application and should not be regarded as limiting the scope of the present application. For those not specified in the embodiments, the conventional conditions or the conditions recommended by the manufacturer are followed. For the reagents or instruments not specified by the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0096] Example 1

[0097] In the first aspect of this embodiment, an antioxidant coating is provided, which includes a first coating and a second coating stacked in sequence; the first coating is an MCrAlY layer, where M is Co and Ni, and the second coating is a nano Al-Al2O3 layer;

[0098] The thickness of the first coating is 60 μm, the thickness of the second coating is 826 nm, and the molar ratio of Al to Al2O3 in the nano Al-Al2O3 layer is 1:1.2.

[0099] In the second aspect of this embodiment, a method for preparing an antioxidant coating is provided, including:

[0100] S1: Spraying an MCrAlY layer on the surface of the substrate by supersonic flame spraying, where the substrate is a GH4169 nickel-based superalloy;

[0101] S2: In an environment with a vacuum degree of 1.0×10 -1 Pa, magnetron sputtering is performed on the substrate processed in step S1 to set a nano Al-Al2O3 layer, obtaining an antioxidant coating, where the temperature of the substrate during magnetron sputtering is 450 °C, the carrier gas flow rate of argon is 300 mL / min, the voltage is 300 V, the bias voltage is 550 V, the duty cycle is 30%, and the current is 0.3 A.

[0102] The scanning electron microscope of the second coating in this antioxidant coating is as Figure 3 shown.

[0103] In the third aspect of this embodiment, a high-temperature component is provided, which includes the above-mentioned substrate and an antioxidant coating provided on the surface of the substrate.

[0104] Example 2

[0105] The difference from Example 1 is that the substrate after magnetron sputtering is further cooled. After reaching room temperature, pre-oxidation treatment is performed in an atmospheric environment. The temperature of the pre-oxidation treatment is 850 °C and the time is 4 h. The scanning electron microscope of the second coating is as Figure 4 shown.

[0106] Example 3

[0107] The difference from Example 1 is that a Ni-Al layer is provided on the surface of the substrate by aluminizing.

[0108] Example 4

[0109] The difference from Example 1 is that a Pt-Al layer is provided on the surface of the substrate by CVD.

[0110] Comparative Example 1

[0111] The difference from Example 1 is that the nano Al-Al2O3 layer is not provided.

[0112] The scanning electron microscope image of the coating prepared in this comparative example after oxidation (under the same conditions as in Example 1) is as follows Figure 5 shown

[0113] The schematic diagram of the principle of the oxidation weight gain curves of the antioxidant coating in Example 1 and the coating in this comparative example is as follows Figure 6 shown. The left figure is the coating of this comparative example, and the right figure is the antioxidant coating of Example 1. As can be seen from Figure 6 it, from the slope of the curve of the oxidation weight gain versus oxidation time in the initial stage of oxidation, compared with Comparative Example 1 without the nano Al-Al2O3 layer, due to the presence of the nano Al-Al2O3 layer in Example 1, the weight gain in the initial stage of oxidation is significantly reduced, and the oxidation rate (curve slope) in the initial stage of oxidation is also significantly decreased. This is because in Example 1, the competitive oxidation stage is skipped in the initial stage of oxidation, and Al is rapidly oxidized to form a dense and ordered α-Al2O3

[0114] Comparative Example 2

[0115] The difference from Example 1 is that the nano Al-Al2O3 layer is replaced with a pure aluminum layer

[0116] The oxidation weight gain curve tests of the coatings provided by Example 1, Example 2, Comparative Example 1 and Comparative Example 2 are as follows Figure 7 shown

[0117] Comparative Example 3

[0118] The difference from Example 1 is that the nano Al-Al2O3 layer is replaced with a pure Al2O3 layer

[0119] Comparative Example 4

[0120] The difference from Example 1 is that the first coating is not provided

[0121] Comparative Example 5

[0122] The difference from Example 1 is that the thickness of the second coating is 100 nm

[0123] Comparative Example 6

[0124] The difference from Example 1 is that the molar ratio of Al to Al2O3 in the nano Al-Al2O3 layer is 1:3

[0125] Comparative Example 7

[0126] The difference from Example 1 is that when the second coating is set, electroplating is used instead of magnetron sputtering

[0127] Comparative Example 8

[0128] The difference from Example 1 is that the vacuum degree is 8.0×10 -1 Pa

[0129] The above-mentioned examples and comparative examples were subjected to an oxidation weight gain test (1100 °C, 100 h), and the specific test results are shown in Table 1.

[0130] Table 1 High-temperature oxidation resistance test

[0131]

[0132] Among them, in Example 2, after pre-oxidation treatment, α-Al2O3 was directly formed on the second coating, while in Examples 1, 3, and 4, α-Al2O3 was rapidly formed after oxidation resistance treatment.

[0133] The coatings formed from the above-mentioned examples and comparative examples were subjected to an oxidation test. This oxidation test was divided into three stages: the initial stage of oxidation, the middle stage of oxidation, and the late stage of oxidation. The specific data are shown in Table 2.

[0134] Table 2 Oxidation test

[0135]

[0136] Among them, during the competitive oxidation stage in the initial stage of oxidation, the thickness of the TGO increased, but neither θ-Al2O3 nor other oxides had a dense and ordered structure and had no oxidation resistance effect;

[0137] During the α-Al2O3 formation stage in the initial stage of oxidation, the TGO had high density and had oxidation resistance;

[0138] The α-Al2O3 formation stage in the initial stage of oxidation and the α-Al2O3 growth stage in the middle stage of oxidation were the main stages of oxidation resistance;

[0139] In the late stage of oxidation, the service life of the coating had ended and it had no oxidation resistance effect.

[0140] It should be noted that the service life in the late stage of oxidation can generally reach thousands of times.

[0141] Analysis:

[0142] As can be seen from the results in Table 1, from the perspective of antioxidant effect, the antioxidant properties of the four examples are significantly improved. Among them, the antioxidant property of Example 2 is better. The reason is that the second coating enables the direct formation of an ordered and dense α-Al2O3 without having to go through the competitive oxidation stage in the initial stage of oxidation; the second coating of Comparative Example 2 is pure Al. Although there is no other element participating in the competitive oxidation, due to the absence of Al2O3 nucleation, a loose and unstable θ-Al2O3 will be formed first and then transformed into α-Al2O3; Comparative Example 1 is the current conventional technology. The process control of Comparative Examples 3, 6, 7, and 8 causes the second coating to peel off after deposition or at the beginning of the antioxidant test. The second coating of Comparative Example 5 is too thin to have an obvious effect. Therefore, the oxidation processes of Comparative Examples 1, 3, 5, 6, 7, and 8 are consistent with the oxidation mechanism of the existing conventional technology. θ-Al2O3 and other oxides will be formed in the initial stage of oxidation. The structures of these products are not dense, do not have protection properties, and are relatively large in volume, resulting in a relatively thick TGO film being formed; Comparative Example 4 has no first coating, and the Al content in the second coating and the substrate is not sufficient to complete the 100-hour antioxidant test, resulting in a significant increase in weight gain in the later stage of oxidation.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0144] In addition, those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of the features of different embodiments means that it is within the scope of the present application and forms different embodiments. For example, in the above claims, any one of the claimed embodiments can be used in any combination. The information disclosed in this background art section is only intended to deepen the understanding of the overall background art of the present application, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art.

Claims

1. A method for preparing an anti-oxidation coating, characterized in that: include: A first coating is provided on the surface of the substrate by using a thermal spraying method or / and an aluminizing method; Under a vacuum environment, magnetron sputtering is performed on the surface of the first coating to form a second coating to obtain an anti-oxidation coating; Cooling the substrate, the first coating and the second coating after the magnetron sputtering, and performing a pre-oxidation treatment in an atmospheric environment; The pre-oxidation treatment is performed at a temperature of 750°C-900°C and for a time of 2h-8h; The anti-oxidation coating is a first coating and a second coating that are stacked in sequence; The first coating layer comprises one or more of an MCrAlY layer, a Ni-Al layer, and a Pt-Al layer, wherein M comprises Co and / or Ni; The second coating layer includes a nano-Al-Al2O3 layer; The thickness of the first coating is 30 μm-200 μm; The thickness of the second coating layer is 200nm-1000nm; The molar ratio of Al to Al2O3 in the nano Al-Al2O3 layer is 1:0.9-1.

5.

2. The method for preparing the anti-oxidation coating according to claim 1, characterized in that: The vacuum degree of the vacuum environment is 2×10 -1 Pa-9.3×10 -2 Pa.

3. The method for preparing the anti-oxidation coating according to claim 1, characterized in that: At least one of the following conditions is met: A. the temperature of the substrate and the first coating during the magnetron sputtering is 350° C.-550° C.; B. The carrier gas flow rate of argon or nitrogen during the magnetron sputtering process is 150mL / min-600mL / min; C. The bias voltage during the magnetron sputtering process is 200V-800V; D. The duty cycle during the magnetron sputtering process is 15%-45%.

4. A high temperature component, characterized in that: It comprises a substrate and an anti-oxidation coating arranged on the surface of the substrate; The anti-oxidation coating comprises an anti-oxidation coating prepared by the method for preparing an anti-oxidation coating according to any one of claims 1 to 3; The substrate includes a nickel-based high-temperature alloy and / or a single crystal high-temperature alloy.

5. An aviation device, characterized in that: Comprising the high-temperature component as claimed in claim 4.

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