A coating material system and a preparation method of a metal surface barrier layer high-conductivity layer antioxidation layer synergistic effect

Abstract

The application provides a coating material system with synergistic effect of metal surface barrier layer, high-conductivity layer and oxidation-resistant layer, which is composed of a first protective layer formed by Y2O3 and / or CeO2 and a second protective layer formed by NiCuFeY, NiCoFe, NiCoFeZr or MnCoFe powder material. The application fully utilizes the synergistic effect between the first protective layer formed by Y2O3 and / or CeO2 and the second protective layer formed by NiCuFeY, NiCoFe, NiCoFeZr or MnCoFe powder material, so that the coating material system can realize long-term oxidation resistance and high-conductivity performance at 700-800 DEG C. The application provides a preparation method of the coating material system, a first protective layer composed of Y2O3 and / or CeO2 is prepared by using a supersaturated solution impregnation method, and a second protective layer composed of NiCuFeY, NiCoFe, NiCoFeZr or MnCoFe powder material is further prepared on the first protective layer by using a slurry method, so that the coating material system is uniform and dense, and the uniformity of the coating material system prepared can be ensured even for a hot end part with a complex inner cavity and small-angle outer shape structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composite coating, in particular to a coating material system with synergistic effect of barrier layer, high-conductivity layer and oxidation-resistant layer on metal surface and a preparation method thereof. BACKGROUND

[0002] The existing protective (oxidation-resistant) coating material on the surface of high-temperature alloy (titanium-based, iron-based, nickel-based) substrate is generally an aluminide coating containing Al, such as aluminide coatings NiAl, NiCoCrAlY and AlNiCr-based high-entropy alloy, which have been widely used in long-term oxidation resistance technology. The oxidation-resistant mechanism is to form a dense Al2O3 film on the surface to protect the metal substrate.

[0003] However, in long-term high-temperature service, Al elements will be consumed continuously. There is also interdiffusion between the oxidation-resistant coating and the substrate interface, that is, Al elements will diffuse outward to form Al2O3, and will also diffuse inward to form harmful intermetallic compounds with the high-temperature alloy interface, which will adversely affect the high-temperature durability of the substrate material, resulting in the alloy material not meeting the requirement of long-term stable oxidation resistance for more than 5000 hours.

[0004] In addition, for complex inner cavities and outer shape structures such as small-angle structures, thermal spraying, CVD, PVD and other technologies cannot achieve uniform preparation of the coating. SUMMARY

[0005] In view of the above problems in the prior art, the present application provides a coating material system with synergistic effect of barrier layer, high-conductivity layer and oxidation-resistant layer on metal surface, which adopts a coating structure of surface diffusion barrier layer + oxidation-resistant layer to meet the requirement of long-term oxidation resistance of metal substrate for thousands of hours. The present application also provides a preparation method of the coating material system with synergistic effect of barrier layer, high-conductivity layer and oxidation-resistant layer on metal surface to achieve uniform preparation of the coating on the substrate surface.

[0006] The specific application contents are as follows:

[0007] In a first aspect, the present application provides a preparation method of a coating material system with synergistic effect of barrier layer, high-conductivity layer and oxidation-resistant layer on metal surface, which comprises the following steps:

[0008] S1, immersing an alloy substrate in a supersaturated solution of Y2O3 and / or CeO2 to wrap the alloy substrate surface with a crystal layer of 2-3 μm thick, and transferring to an oven for drying treatment to obtain an alloy substrate with a first protective layer formed on the surface;

[0009] S2, performing heat treatment on the alloy substrate with a first protective layer formed on the surface at 300-500℃ for 2-5h under argon protection;

[0010] S3, after the NiCuFeY, NiCoFe, NiCoFeZr or MnCoFe powder material is mixed uniformly, the powder material is added into a mixed solution composed of water, phosphoric acid, chromium oxide and magnesium oxide, a slurry is prepared, and then the slurry is sprayed uniformly on the alloy substrate treated in S2;

[0011] S4, the alloy substrate treated in S3 is subjected to heat treatment at 700-800℃ for 2-5h under argon protection, and the coating material system is obtained.

[0012] Optionally, in step S1, the temperature of the drying treatment is 200℃, and the time of the drying treatment is 30min.

[0013] Optionally, in step S2, the temperature of the heat treatment is 500℃, and the time of the heat treatment is 2h.

[0014] Optionally, in step S3, the NiCuFeY powder material is mixed by Ni powder, Cu powder, Fe powder and Y powder with a mass ratio of 1:1:1:1;

[0015] The NiCoFe powder material is mixed by Ni powder, Co powder and Fe powder with a mass ratio of 1:1:1;

[0016] The NiCoFeZr powder material is mixed by Ni powder, Co powder, Fe powder and Zr powder with a mass ratio of 1:1:1:0.1;

[0017] The MnCoFe powder material is mixed by Mn powder, Co powder and Fe powder with a mass ratio of 1:1:1.

[0018] Optionally, in step S3, in the slurry, the mass-volume ratio of the NiCuFeY, NiCoFe, NiCoFeZr or MnCoFe powder material to the mixed solution is 1.2g:1ml;

[0019] In the mixed solution, the mass ratio of the water, phosphoric acid, chromium oxide and magnesium oxide is 50:16.7:16.7:16.7.

[0020] Optionally, in step S3, the particle size of the NiCuFeY, NiCoFe, NiCoFeZr and MnCoFe powder material is micron level.

[0021] Optionally, in step S4, the temperature of the heat treatment is 800℃, and the time of the heat treatment is 2h.

[0022] In a second aspect, the present application provides a coating material system with synergistic effect of metal surface barrier layer, high-conductivity layer and oxidation-resistant layer, which is obtained by the preparation method of the first aspect, and is composed of a first protective layer composed of Y2O3 and / or CeO2, and a second protective layer composed of NiCuFeY, NiCoFe, NiCoFeZr and MnCoFe.

[0023] The total thickness of the coating material system is 30-40 microns, and the thickness of the first protective layer is 2-3 microns.

[0024] Optionally, the high-temperature alloy substrate includes heat-resistant stainless steel 310S, high-temperature alloy K456, Incoloy M956 or DZ640M.

[0025] Optionally, the surface of the high-temperature alloy substrate is the surface of the high-temperature alloy substrate after oil removal and sand blasting treatment.

[0026] The coating material system is used to protect the high-temperature alloy substrate to work stably at 700-800 degrees Celsius.

[0027] Compared with the prior art, the present application has the following advantages:

[0028] The present application provides a coating material system with synergistic effect of metal surface barrier layer, high-conductivity layer and oxidation-resistant layer, which is composed of a first protective layer formed by Y2O3 and / or CeO2, and a second protective layer formed by NiCuFeY, NiCoFe, NiCoFeZr or MnCoFe powder material. The present application fully utilizes the synergistic effect between the first protective layer formed by Y2O3 and / or CeO2 and the second protective layer formed by NiCuFeY, NiCoFe, NiCoFeZr or MnCoFe powder material, so that the coating material system can realize long-term oxidation resistance and high-conductivity performance at 700-800 degrees Celsius.

[0029] The present application provides another preparation method of a coating material system with synergistic effect of metal surface barrier layer, high-conductivity layer and oxidation-resistant layer. The method uses supersaturated solution immersion to prepare a first protective layer composed of Y2O3 and / or CeO2, and further uses slurry method to prepare a second protective layer composed of NiCuFeY, NiCoFe, NiCoFeZr or MnCoFe powder material on the basis of the first protective layer. The prepared coating material system is uniform and dense, and can ensure the uniformity of the coating material system even for small-angle and complex inner cavity and outer shape structure of hot end components. Compared with plasma spraying, laser cladding, PVD and CVD, the method has the characteristics of low cost and high yield. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative effort based on these drawings.

[0031] Figure 1 A flow chart of a preparation method of a coating material system provided by the embodiments of the present application is shown. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only represent some of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, any person under the inspiration of the present application or combining the present application with other prior art features can obtain any product same or similar to the present application, which falls within the protection scope of the present application. In addition, all other embodiments obtained by those skilled in the art without creative effort fall within the protection scope of the present application.

[0033] If the specific experimental steps or conditions are not mentioned in the embodiments, the operation or conditions can be performed according to the conventional experimental steps described in the prior art. If the reagents and other instruments are not mentioned by the manufacturers, they are all conventional reagent products that can be obtained by market purchase. In addition, the drawings are only schematic diagrams of the embodiments of the present application, and are not necessarily drawn to scale. The same reference signs in the drawings represent the same or similar parts, and thus repeated description thereof will be omitted. Some block diagrams shown in the drawings are functional entities, which do not necessarily correspond to physically or logically independent entities.

[0034] The technologies, methods and devices known to those skilled in the relevant art can not be discussed in detail, but under appropriate circumstances, the technologies, methods and devices should be regarded as part of the present application.

[0035] In the description of the present application, it should be understood that the words "first", "second" and the like are used to distinguish the parts, and are only used for the convenience of distinguishing the corresponding parts, and have no special meaning unless otherwise stated. Therefore, it cannot be understood as a limitation on the protection scope of the present application.

[0036] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0037] In a first aspect, the present application provides a preparation method of a coating material system with synergistic effects of a metal surface barrier layer, a high-conductivity layer and an oxidation-resistant layer, Figure 1 A flow chart of the preparation method of the coating material system provided by the embodiment of the present application is shown in FIG. 1. Figure 1 As shown in FIG. 1, the method comprises the following steps:

[0038] S1, immersing an alloy substrate in a supersaturated solution of Y2O3 and / or CeO2 to form a 2-3 μm-thick crystal layer on the surface of the alloy substrate, and then transferring the alloy substrate to an oven for drying treatment to obtain an alloy substrate with a first protective layer formed on the surface;

[0039] S2, performing heat treatment on the alloy substrate with the first protective layer formed on the surface at 300-500 ℃ for 2-5 h under argon protection;

[0040] S3, uniformly mixing NiCuFeY, NiCoFe, NiCoFeZr or MnCoFe powder materials, adding the mixed powder materials into a mixed solution composed of water, phosphoric acid, chromium oxide and magnesium oxide, preparing a slurry, and then uniformly spraying the slurry on the surface of the alloy substrate treated in S2;

[0041] S4, performing heat treatment on the alloy substrate treated in S3 at 700-800 ℃ for 2-5 h under argon protection to obtain the coating material system.

[0042] In specific implementation, the first protective layer composed of Y2O3 and / or CeO2 is prepared on the surface of the high-temperature alloy by means of supersaturated solution immersion. Due to the chemical stability and lattice structure characteristics of Y2O3 and CeO2, Y2O3 and / or CeO2 plays an important role in preventing atomic or ionic diffusion. As a protective coating directly contacting the surface of the high-temperature alloy, Y2O3 and / or CeO2 can effectively inhibit the diffusion of metal elements in the alloy substrate and has high diffusion barrier capacity. In addition, Y2O3 and CeO2 can form a dense reaction layer or oxide film with the alloy substrate, which can prevent further oxidation and corrosion of the metal surface and further slow down the reaction rate of metal elements. By hindering the mutual penetration of metal elements, the mutual diffusion in the alloy substrate can be effectively reduced. Therefore, the first protective layer composed of Y2O3 and / or CeO2 has high melting point and thermal stability, can maintain good chemical stability and structural stability, and can protect the alloy substrate from the influence of element diffusion and reaction in a high-temperature environment.

[0043] In specific implementation, the means of supersaturated solution immersion can realize uniform preparation of the first protective layer on the hot end components with complex inner cavities and outer shapes at small angles, and the preparation method is simple.

[0044] In the implementation, the first protective layer prepared by the impregnation method under argon protection is subjected to heat treatment at 300-500 ℃ for 2-5 h to obtain sufficient shrinkage energy for further densification of the first protective layer and to improve the bonding strength with the substrate; the heat treatment avoids the problems of porosity and coating cracks in the later high-temperature use, and affects the quality of the finally obtained coating system. The preferred heat treatment temperature is 500 ℃, and the time is 2 h.

[0045] In the implementation, the NiCuFeY powder material selected in the embodiment is mixed by Ni powder, Cu powder, Fe powder and Y powder with a mass ratio of 1:1:1:1; the NiCoFe powder material is mixed by Ni powder, Co powder and Fe powder with a mass ratio of 1:1:1; the NiCoFeZr powder material is mixed by Ni powder, Co powder, Fe powder and Zr powder with a mass ratio of 1:1:1:0.1; and the MnCoFe powder material is mixed by Mn powder, Co powder and Fe powder with a mass ratio of 1:1:1. The slurry is formed after the NiCuFeY, NiCoFe, NiCoFeZr or MnCoFe powder material with a mass-volume ratio of 1.2 g:1 ml is mixed with the mixed solution. In the mixed solution, the mass ratio of water, phosphoric acid, chromium oxide and magnesium oxide is 50:16.7:16.7:16.7.

[0046] In the implementation, the particle size of the NiCuFeY, NiCoFe, NiCoFeZr or MnCoFe powder material selected in the embodiment is micron grade to ensure the uniformity of the slurry spraying. After the slurry is sprayed on the surface of the first protective layer, high-temperature heat treatment is performed to realize the full metallurgical bonding of the NiCuFeY, NiCoFe, NiCoFeZr or MnCoFe powder material and the first protective layer. The preferred heat treatment temperature is 1050 ℃, and the time is 2 h.

[0047] In the second aspect, the application provides a coating material system with synergistic effect of the metal surface barrier layer, high-conductivity layer and oxidation-resistant layer, which is obtained by the preparation method of the first aspect. The coating material system is composed of a first protective layer composed of Y2O3 and / or CeO2 and a second protective layer composed of NiCuFeY, NiCoFe, NiCoFeZr or MnCoFe. The total thickness of the coating material system is 30-40 μm, and the thickness of the first protective layer is 2-3 μm.

[0048] The coating material system provided by the application is specifically composed of a first protective layer composed of Y2O3 and / or CeO2, and a second protective layer composed of NiCuFeY, NiCoFe, NiCoFeZr or MnCoFe. The first protective layer has good oxidation resistance and can form a dense oxide film to effectively isolate the erosion of oxygen and other oxidizing media on the metal substrate. In addition, Y2O3 and / or CeO2 have important effects on preventing atomic or ionic diffusion due to their chemical stability and lattice structure characteristics. As a protective coating layer in direct contact with the surface of the high-temperature alloy, Y2O3 and / or CeO2 can effectively inhibit the diffusion of metal elements in the alloy substrate and have high diffusion barrier capacity, thereby protecting the alloy substrate from the influence of element diffusion and reaction in a high-temperature environment.

[0049] Further, the second protective layer composed of NiCuFeY, NiCoFe, NiCoFeZr or MnCoFe further protects the first protective layer and reduces the damage of the external environment to the first protective layer. In addition, NiCuFeY, NiCoFe, NiCoFeZr and MnCoFe materials are all protective layers with outstanding oxidation resistance and corrosion resistance, and in combination with the Y2O3 and / or CeO2 coating layer, the heat corrosion resistance and wear resistance can be further improved, the thermal stability of the overall coating layer can be further improved, the oxidation resistance, heat corrosion resistance, hardness and wear resistance can be improved, and the coating layer can be prevented from cracking and peeling off during high-temperature work. Such combination can provide a stronger protective layer for the high-temperature alloy and prolong the service life.

[0050] The high-temperature alloy substrate used in the coating material system provided by the application includes heat-resistant stainless steel 310S, high-temperature alloy K456, Incoloy M956 or DZ640M. The surface of the high-temperature alloy substrate needs to be deoiled and sandblasted before the preparation of the coating material system to keep the surface clean.

[0051] The coating material system provided by the embodiment of the application can be used to protect the high-temperature alloy substrate to work stably at 700-800 DEG C.

[0052] In order for those skilled in the art to more clearly understand the application, the coating material system and the preparation method of the metal surface barrier layer high-conductivity layer oxidation-resistant layer synergistic effect provided by the application are described in detail through the following examples.

[0053] Example 1

[0054] The Fe441 alloy material was used as the high-temperature alloy substrate material and was fixed by a fixed clamping device.

[0055] The high-temperature alloy base material is placed in a supersaturated yttrium oxide and cerium oxide mixed solution for 2 minutes through surface sand blasting and cleaning treatment, so that yttrium oxide and cerium oxide grains are uniformly attached to the surface of the high-temperature alloy base, and then the high-temperature alloy base material is placed in an oven for drying treatment at 200°C for 30 minutes.

[0056] The high-temperature alloy base material after the drying treatment is subjected to heat treatment at 500°C for 2 hours under argon protective gas, so that a dense first protective layer composed of Y2O3 or CeO2 is formed on the surface. At the same time, the heat treatment improves the bonding strength of the coating and the base.

[0057] Ni powder, Cu powder, Fe powder and Y powder with a mass ratio of 1:1:1:1 are weighed and mixed to form NiCuFeY powder, which is added to a mixed solution formed by mixing water, phosphoric acid, chromium oxide and magnesium oxide with a mass ratio of 50:16.7:16.7:16.7 to prepare a slurry, which is uniformly sprayed on the surface of the first protective layer, dried, and then heat treated at 800°C for 2 hours to obtain a 30-40 micron coating system.

[0058] Example 2

[0059] The heat-resistant stainless steel 310S material is used as the high-temperature alloy base material, which is fixed by a fixed clamping device.

[0060] The high-temperature alloy base material is placed in a supersaturated yttrium oxide mixed solution for 2 minutes through surface sand blasting and cleaning treatment, so that yttrium oxide grains are uniformly attached to the surface of the high-temperature alloy base, and then the high-temperature alloy base material is placed in an oven for drying treatment at 200°C for 30 minutes.

[0061] The high-temperature alloy base material after the drying treatment is subjected to heat treatment at 500°C for 2 hours under argon protective gas, so that a dense first protective layer composed of Y2O3 is formed on the surface. At the same time, the heat treatment improves the bonding strength of the coating and the base.

[0062] Ni powder, Co powder and Fe powder with a mass ratio of 1:1:1 are weighed and mixed to form NiCoFe powder, which is added to a mixed solution formed by mixing water, phosphoric acid, chromium oxide and magnesium oxide with a mass ratio of 50:16.7:16.7:16.7 to prepare a slurry, which is uniformly sprayed on the surface of the first protective layer, dried, and then heat treated at 800°C for 2 hours to obtain a 30-40 micron coating system.

[0063] Example 3

[0064] The high-temperature alloy K456 material is used as the high-temperature alloy base material, which is fixed by a fixed clamping device.

[0065] The high-temperature alloy substrate material is placed in the supersaturated cerium oxide mixed solution for 2 minutes through sand blasting and cleaning treatment of the surface, so that the cerium oxide grains are uniformly attached to the surface of the high-temperature alloy substrate, and then the high-temperature alloy substrate material is placed in an oven for drying treatment at 200°C for 30 minutes.

[0066] The high-temperature alloy substrate material after the drying treatment is subjected to heat treatment at 500°C for 2 hours under argon protective gas, so that a dense first protective layer composed of cerium oxide is formed on the surface. At the same time, the heat treatment improves the bonding strength of the coating and the substrate.

[0067] The Ni powder, Co powder, Fe powder and Zr powder with a mass ratio of 1:1:1:0.1 are mixed to form a NiCoFeZr powder, which is added to a mixed solution formed by mixing water, phosphoric acid, chromium oxide and magnesium oxide with a mass ratio of 50:16.7:16.7:16.7, to prepare a slurry, which is uniformly sprayed on the surface of the first protective layer, and after drying, heat treatment at 800°C for 2 hours is performed to obtain a 30-40 micron coating system.

[0068] Example 4

[0069] The DZ640M material is used as the high-temperature alloy substrate material, which is fixed by a fixed clamping device.

[0070] The high-temperature alloy substrate material is placed in the supersaturated cerium oxide mixed solution for 2 minutes through sand blasting and cleaning treatment of the surface, so that the cerium oxide grains are uniformly attached to the surface of the high-temperature alloy substrate, and then the high-temperature alloy substrate material is placed in an oven for drying treatment at 200°C for 30 minutes.

[0071] The high-temperature alloy substrate material after the drying treatment is subjected to heat treatment at 500°C for 2 hours under argon protective gas, so that a dense first protective layer composed of cerium oxide is formed on the surface. At the same time, the heat treatment improves the bonding strength of the coating and the substrate.

[0072] The Mn powder, Co powder and Fe powder with a mass ratio of 1:1:1 are mixed to form a MnCoFe powder, which is added to a mixed solution formed by mixing water, phosphoric acid, chromium oxide and magnesium oxide with a mass ratio of 50:16.7:16.7:16.7, to prepare a slurry, which is uniformly sprayed on the surface of the first protective layer, and after drying, heat treatment at 800°C for 2 hours is performed to obtain a 30-40 micron coating system.

[0073] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification.

[0074] For the method embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the order of the described actions, because according to the present application, certain steps can be performed in other order or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification are all preferred embodiments, and the actions and components involved are not necessarily necessary for the present application.

[0075] The above describes in detail the metal surface barrier layer high-conductivity layer anti-oxidation layer synergistic coating material system and the preparation method provided by the present application. In this paper, specific examples are applied to explain the principles and implementation modes of the present application. The above embodiment description is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. A method for preparing a coating material system in which a metal surface barrier layer, a highly conductive layer, and an antioxidant layer work synergistically, characterized in that, The method includes the following steps: S1. Immerse the alloy substrate in a supersaturated solution of Y2O3 and / or CeO2 to coat the surface of the alloy substrate with a 2-3 μm thick crystalline layer, and transfer it to an oven for drying to obtain an alloy substrate with a first protective layer formed on the surface. S2. Under argon protection, the alloy substrate on which the first protective layer is formed is subjected to heat treatment at 300-500 °C for 2-5 h. S3. After uniformly mixing NiCuFeY, NiCoFe, NiCoFeZr or MnCoFe powder materials, add them to a mixed solution composed of water, phosphoric acid, chromium oxide and magnesium oxide to prepare a slurry. Then, spray the slurry evenly onto the surface of the alloy substrate treated by S2. S4. Under argon protection, the alloy substrate treated in S3 is subjected to heat treatment at 700-800 ℃ for 2-5 h to obtain the coating material system. The NiCuFeY powder material is composed of Ni powder, Cu powder, Fe powder and Y powder mixed in a mass ratio of 1:1:1:

1. The NiCoFe powder material is composed of Ni powder, Co powder and Fe powder mixed in a mass ratio of 1:1:1; The NiCoFeZr powder material is composed of Ni powder, Co powder, Fe powder and Zr powder mixed in a mass ratio of 1:1:1:0.

1. The MnCoFe powder material is composed of Mn powder, Co powder and Fe powder mixed in a mass ratio of 1:1:1; In the slurry, the mass-to-volume ratio of the NiCuFeY, NiCoFe, NiCoFeZr, or MnCoFe powder material to the mixed solution is 1.2 g: 1 ml; In the mixed solution, the mass ratio of water, phosphoric acid, chromium oxide, and magnesium oxide is 50:16.7:16.7:16.

7.

2. The preparation method according to claim 1, characterized in that, In step S1, the drying temperature is 200°C and the drying time is 30 min.

3. The preparation method according to claim 1, characterized in that, In step S2, the heat treatment temperature is 500°C and the heat treatment time is 2 hours.

4. The preparation method according to claim 1, characterized in that, In step S3, the particle size of the NiCuFeY, NiCoFe, NiCoFeZr, and MnCoFe powder materials is in the micrometer range.

5. The preparation method according to claim 1, characterized in that, In step S4, the heat treatment temperature is 800℃ and the heat treatment time is 2 hours.

6. A coating material system with synergistic effects of a metal surface barrier layer, a highly conductive layer, and an antioxidant layer obtained by the preparation method according to any one of claims 1-5, characterized in that, The coating material system consists of a first protective layer composed of Y2O3 and / or CeO2, and a second protective layer composed of NiCuFeY, NiCoFe, NiCoFeZr and MnCoFe. The total thickness of the coating material system is 30-40 μm, wherein the thickness of the first protective layer is 2-3 μm.

7. The coating material system according to claim 6, characterized in that, The high-temperature alloy matrix includes: heat-resistant stainless steel 310S, high-temperature alloy K456, Fe441 alloy or DZ640M.

8. The coating material system according to claim 7, characterized in that, The surface of the high-temperature alloy substrate is the surface of the high-temperature alloy substrate after degreasing and sandblasting treatment; The coating material system is used to protect the high-temperature alloy substrate and ensure its stable operation at 700-800 ℃.

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