A method for preparing a seed coat structure bionic ZrB2-MoSi2-based oxidation-resistant coating

Abstract

The application relates to a preparation method of a seed coat structure bionic ZrB2-MoSi2-based oxidation-resistant coating, ZrB2-MoSi2 powder is prepared by a combustion synthesis method; ZrB2-MoSi2 powder suspension dispersion liquid and a polysilicate ethyl ester precursor dispersion liquid are configured; a silicon-containing shell layer is formed on the surface of the ZrB2-MoSi2 powder, and seed coat structure precursor powder is obtained; the seed coat structure precursor powder is subjected to vacuum heat treatment, and seed coat structure bionic ZrB2-MoSi2-based oxidation-resistant coating powder is obtained; the coating powder is laid on the surface of a substrate, and a ZrB2-MoSi2-based oxidation-resistant coating is obtained; the seed coat structure bionic design is used, problems such as particle agglomeration, local segregation and uneven interface distribution are overcome when an exogenous film-forming component is introduced in a mechanical mixing mode, the interface distribution of the film-forming component in the coating is improved, and agglomeration, segregation and glass phase segregation caused by mechanical mixing are reduced; the structure can play a synergistic role of outer layer SiO2 pre-packaging and core component in-situ self-healing film forming, and further improve the continuity, stability and comprehensive protection performance of the oxygen-blocking structure of the coating.

Description

Technical Field

[0001] This application relates to the field of thermal protective coating technology, specifically to a method for preparing a seed coat structure-inspired ZrB2-MoSi2-based antioxidant coating. Background Technology

[0002] Carbon materials (C / C composites, graphite, etc.) are important candidate materials for high-temperature structural components such as aerospace combustion chambers, nose cones, and sharp leading edges due to their low density, high specific strength, and excellent high-temperature mechanical stability. However, carbon materials are prone to continuous oxidation and degradation in oxygen-containing environments above 673K, leading to a decline in their mechanical properties and a loss of structural integrity, severely limiting their application in extreme thermal environments. In recent years, anti-oxidation coating technology has been widely used as an efficient high-temperature anti-oxidation protection method for carbon material surfaces.

[0003] ZrB2-MoSi2 coatings have attracted widespread attention for ultra-high temperature oxidation protection of carbon-based materials due to their high melting point, good oxidation resistance, and excellent thermal shock resistance. During oxidation, MoSi2 forms a SiO2 glass phase with viscous flow and defect-filling capabilities, while ZrO2 microcrystals formed by ZrB2 oxidation are dispersed within the glass phase, which is beneficial for improving the structural stability and oxygen diffusion barrier ability of the oxide film. Therefore, ZrB2-MoSi2 coatings have great potential in high-temperature oxidation resistance. To further enhance the microscale composite of ZrB2 and MoSi2 and the oxidation self-healing response of the coating, a self-propagating high-temperature synthesis method was used to prepare ZrB2-MoSi2 alloyed composite powder. This method can shorten the transport distance required for oxidation reaction, glass phase formation, and defect repair, thereby improving the oxidation response and self-healing efficiency of the coating. However, its oxidation self-healing process still has a significant temperature dependence. In the early stage of oxidation or at lower temperatures, the protective glass phase is formed slowly and has insufficient fluidity, making it difficult to form a continuous oxygen barrier film in a timely manner.

[0004] To address the issues of slow protective glass phase formation and insufficient high-temperature stability, borosilicate glass can be used as a film-forming modifier to improve the oxidation resistance of transition metal boride-silicide coatings. Jiang et al. (Jiang Chao. Research on Wide-Temperature-Range High Oxygen Barrier Coatings of Transition Metal Borides-Silicides Modified with Borosilicate Glass [D]. China University of Mining and Technology, 2025) introduced borosilicate glass into transition metal boride-silicide coatings and used nano-ZrO2 to microcrystalize the glass phase. By leveraging the flow-filling effect of the low-softening-temperature glass phase and the dispersion-stabilizing effect of zirconium-containing microcrystals, the continuity of the oxide film and the high-temperature stability of the glass phase were improved, thereby enhancing the oxidation resistance of the coating.

[0005] However, when exogenous film-forming components are introduced through mechanical mixing, problems such as particle agglomeration, localized segregation, and uneven interface distribution easily occur. This severely inhibits the self-healing efficiency of the ZrB2-MoSi2 alloying system, making it difficult to form a uniform and continuous protective structure around the composite particles. Discretely distributed film-forming components require softening, migration, and spreading in the early stages of high-temperature oxidation to achieve effective sealing, causing the establishment of the oxygen barrier to lag behind the initial oxygen penetration. Therefore, it is urgent to develop feasible solutions to ensure a uniform distribution of film-forming components within the coating, improving the continuity of the oxygen barrier structure and the high-temperature protective performance of the coating. Summary of the Invention

[0006] The present invention aims to provide a method for preparing a biomimetic ZrB2-MoSi2-based antioxidant coating with a seed coat structure, which utilizes biomimetic structural design to overcome the shortcomings of the existing technology.

[0007] Specifically, a method for preparing a ZrB2-MoSi2-based antioxidant coating includes: (1) ZrB2-MoSi2 powder was prepared by combustion synthesis and then crushed, ground and sieved for later use.

[0008] (2) Weigh ZrB2-MoSi2 powder and polyethyl silicate according to the mass ratio. Disperse ZrB2-MoSi2 powder in an alcohol-water-alkali mixed solvent and add surfactant for ultrasonic dispersion to obtain ZrB2-MoSi2 powder suspension. Dissolve polyethyl silicate in ethanol to prepare polyethyl silicate dispersion. Add polyethyl silicate silicon source precursor solution to the powder dispersion for hydrolysis reaction. (3) A silicon-containing shell layer is formed on the surface of the ZrB2-MoSi2 powder to obtain a seed coat structure precursor powder; the seed coat structure precursor powder is subjected to vacuum heat treatment to obtain a seed coat structure biomimetic ZrB2-MoSi2-based antioxidant coating powder source. (4) The coating powder source is laid on the substrate surface and densified by spark plasma sintering to obtain a ZrB2-MoSi2-based antioxidant coating.

[0009] Preferably, in step (2), the mass ratio of the ZrB2-MoSi2 powder to the polyethyl silicate is in the range of 3:2 to 5:2.

[0010] Preferably, in step (2), the surfactant is tetrabutylammonium bromide, and the concentration range of the tetrabutylammonium bromide in the solvent is 2 g / L to 6 g / L.

[0011] Preferably, in step (2), the volume ratio of the polyethyl silicate to ethanol is 1:30.

[0012] Preferably, in step (2), the silicon source precursor solution is added dropwise to the powder dispersion by a peristaltic pump at a rate of 5 ml / min to 10 ml / min, and the mixture is allowed to stand for 6 hours after the addition is completed; at the same time, magnetic stirring is turned on.

[0013] Preferably, in step (3), the temperature range of the vacuum heat treatment is 300℃~380℃, and the heat treatment time range is 80min~100min.

[0014] Preferably, the densification temperature range of the discharge plasma sintering is 1250℃~1280℃, and the densification time range is 20min~30min.

[0015] Preferably, the alcohol-water-alkali mixed solvent is a mixed solution of anhydrous ethanol, distilled water and ammonia; the volume ratio of the anhydrous ethanol, the distilled water and the ammonia is 12:7:2.

[0016] The present invention also discloses a ZrB2-MoSi2-based antioxidant coating, which is prepared by the above-described method for preparing a ZrB2-MoSi2-based antioxidant coating; The ZrB2-MoSi2-based antioxidant coating contains multiple seed coat structure particles, which include: a core phase composed of ZrB2 and MoSi2; and a shell phase composed of silicon oxide, wherein the shell phase uniformly covers the surface of the core phase.

[0017] The advantages of this invention compared to the prior art are: This invention utilizes a biomimetic design of the seed coat structure to overcome problems such as particle agglomeration, local segregation, and uneven interface distribution that easily occur when exogenous film-forming components are introduced through mechanical mixing. It improves the interface distribution of film-forming components within the coating, reducing agglomeration, segregation, and glass phase segregation caused by mechanical mixing. This structure leverages the synergistic effect of the outer SiO2 pre-encapsulation and the in-situ self-healing film formation of the core components, further enhancing the continuity, stability, and overall protective performance of the coating's oxygen barrier structure. Attached Figure Description

[0018] Figure 1 The XRD phase structures of Examples 1-3 and Comparative Examples 1-2 of this invention are shown.

[0019] Figure 2 This is the cross-sectional morphology of the coating obtained in Example 1 of the present invention.

[0020] Figure 3 This is the cross-sectional morphology of the coating obtained in Example 2 of the present invention.

[0021] Figure 4 This is the cross-sectional morphology of the coating obtained in Example 3 of the present invention.

[0022] Figure 5 This is the cross-sectional morphology of the coating obtained in Comparative Example 1 of the present invention.

[0023] Figure 6 This is the cross-sectional morphology of the coating obtained in Comparative Example 2 of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] The biomimetic design of the seed coat structure described in this application is specifically manifested at the microscopic level as a seed coat structure, namely a covering structure with ZrB2-MoSi2 composite particles as the core phase and silicon oxide as the shell phase. Example 1

[0026] This embodiment provides a method for preparing a ZrB2-MoSi2-based antioxidant coating, which constructs the above-mentioned seed coat structure through an in-situ sol-gel method, specifically including the following steps: (1) ZrB2-MoSi2 powder was prepared by combustion synthesis and then crushed, ground and sieved for later use. Specifically, in this embodiment, the volume ratio of zirconium diboride to molybdenum disilicide was controlled to be 60:40.

[0027] (2) Disperse ZrB2-MoSi2 powder in a solvent containing tetrabutylammonium bromide to obtain a powder dispersion; Specifically, a mixed solution of anhydrous ethanol, distilled water and ammonia was prepared in a volume ratio of 12:7:2 as a solvent, and tetrabutylammonium bromide was added as a particle surface modifier, with its concentration controlled at 4 g / L.

[0028] Add the powder obtained in step (1) to the mixed solution and ultrasonically disperse it at room temperature for 10 min to obtain a uniform and stable powder dispersion. A silicon-based precursor solution of polyethyl silicate was added dropwise to the powder dispersion to carry out a hydrolysis reaction, forming a silicon-containing shell layer on the surface of ZrB2-MoSi2 powder, thus obtaining a seed coat structure precursor powder.

[0029] Specifically, polyethyl silicate was dissolved in ethanol at a volume ratio of 1:30 to prepare a silicon source precursor solution. The raw materials were weighed according to a mass ratio of ZrB2-MoSi2 powder to polyethyl silicate of 4:2. The silicon source precursor solution was slowly added dropwise to the powder dispersion obtained in step (2) at a rate of 7 ml / min using a peristaltic pump, while magnetic stirring was turned on. After the addition was completed, the mixture was cooled to room temperature and allowed to stand for 6 hours.

[0030] (3) Heat-treat the seed coat structure precursor powder to obtain the coating powder source: Specifically, the product obtained in step (2) is centrifuged, washed, dried, and then placed in a vacuum environment for heat treatment at a temperature of 350°C for 90 minutes.

[0031] (4) The coating powder source is laid on the surface of the substrate and densified by spark plasma sintering to obtain a ZrB2-MoSi2-based anti-oxidation coating. Specifically, a graphite substrate is selected, and the coating powder source obtained in step (3) is uniformly laid on the surface of the substrate and placed into an SPS mold for spark plasma sintering. The densification temperature is set to 1270℃ and the densification time is set to 25min, and a coating with a thickness of about 1mm is finally obtained.

[0032] The phase structure of the biomimetic ZrB2-MoSi2-based antioxidant coating obtained in this embodiment is as follows: Figure 1 As shown, the cross-sectional scanning electron microscope image is as follows: Figure 2 As shown in Table 1, the antioxidant performance after 100 min of service in an oxidizing environment at 1700℃ is as follows. It can be seen that the ZrB2-MoSi2-based antioxidant coating obtained in this embodiment has good phase composition, exhibits a seed coat biomimetic structure in the coating cross-section, and has a good heterogeneous phase interface, thus demonstrating excellent oxidation protection effect in an oxidizing environment at 1700℃. Example 2:

[0033] Compared with Example 1, this example relates to a method for preparing a biomimetic ZrB2-MoSi2-based antioxidant coating with a seed coat structure, specifically as follows: (1) ZrB2-MoSi2 powder was prepared by combustion synthesis and then crushed, ground and sieved for later use.

[0034] (2) Weigh ZrB2-MoSi2 powder and polyethyl silicate according to a mass ratio of 4:2, and prepare ZrB2-MoSi2 powder suspension and polyethyl silicate precursor dispersion respectively: A 12:7:2 mixture of anhydrous ethanol, distilled water, and ammonia was prepared by volume ratio, and tetrabutylammonium bromide was added as a particle surface modifier, with its concentration controlled at 4 g / L. ZrB2-MoSi2 powder was then placed in the mixed solution and ultrasonically dispersed to obtain a ZrB2-MoSi2 powder suspension.

[0035] Polyethyl silicate was dissolved in ethanol at a volume ratio of 1:30 to prepare a polyethyl silicate dispersion. The dispersion was then slowly added to the ZrB2-MoSi2 powder suspension using a peristaltic pump at a dropping rate of 7 ml / min, while magnetic stirring was turned on. After the addition was complete, the mixture was cooled to room temperature and allowed to stand for 6 hours.

[0036] (3) After centrifugation, washing and drying, the obtained product yields a precursor powder of ZrB2-MoSi2-based antioxidant coating with seed coat structure. The precursor powder is subjected to vacuum heat treatment at a temperature of 350℃ for 90 min to obtain a powder source of ZrB2-MoSi2-based antioxidant coating with seed coat structure.

[0037] (4) The obtained powder source is spread on the periphery of the graphite matrix and then subjected to low-temperature densification treatment by spark plasma sintering to obtain a seed coat structure biomimetic ZrB2-MoSi2-based antioxidant coating. The densification time is 25 min and the densification temperature is 1270℃.

[0038] The phase structure of the biomimetic ZrB2-MoSi2-based antioxidant coating obtained in this embodiment is as follows: Figure 1 As shown, the cross-sectional scanning electron microscope image is as follows: Figure 3 As shown in Table 1, the antioxidant performance after 100 min of service in an oxidizing environment at 1700℃ is as follows. It can be seen that the ZrB2-MoSi2-based antioxidant coating obtained in this embodiment has good phase composition, exhibits a seed coat biomimetic structure in the coating cross-section, and has a good heterogeneous phase interface, thus demonstrating excellent oxidation protection effect in an oxidizing environment at 1700℃. Example 3:

[0039] Compared with Example 1, this example relates to a method for preparing a biomimetic ZrB2-MoSi2-based antioxidant coating with a seed coat structure, specifically as follows: (1) ZrB2-MoSi2 powder was prepared by combustion synthesis and then crushed, ground and sieved for later use.

[0040] (2) Weigh ZrB2-MoSi2 powder and polyethyl silicate according to a mass ratio of 5:2, and prepare ZrB2-MoSi2 powder suspension and polyethyl silicate precursor dispersion respectively: A 12:7:2 mixture of anhydrous ethanol, distilled water, and ammonia was prepared by volume ratio, and tetrabutylammonium bromide was added as a particle surface modifier, with its concentration controlled at 6 g / L. ZrB2-MoSi2 powder was then placed in the mixed solution and ultrasonically dispersed to obtain a ZrB2-MoSi2 powder suspension.

[0041] Polyethyl silicate was dissolved in ethanol at a volume ratio of 1:30 to prepare a polyethyl silicate dispersion. The dispersion was then slowly added to the ZrB2-MoSi2 powder suspension using a peristaltic pump at a dropping rate of 10 ml / min, while magnetic stirring was turned on. After the addition was complete, the mixture was cooled to room temperature and allowed to stand for 6 hours.

[0042] (3) After centrifugation, washing and drying, the obtained product yields a precursor powder of ZrB2-MoSi2-based antioxidant coating with seed coat structure. The precursor powder is subjected to vacuum heat treatment at a temperature of 380℃ for 100 min to obtain a powder source of ZrB2-MoSi2-based antioxidant coating with seed coat structure.

[0043] (4) The obtained powder source is spread on the periphery of the graphite matrix and then subjected to low-temperature densification treatment by spark plasma sintering to obtain a seed coat structure biomimetic ZrB2-MoSi2-based antioxidant coating. The densification time is 30 min and the densification temperature is 1280℃.

[0044] The phase structure of the biomimetic ZrB2-MoSi2-based antioxidant coating obtained in this embodiment is as follows: Figure 1 As shown, the cross-sectional scanning electron microscope image is as follows: Figure 4 As shown in Table 1, the antioxidant performance after 100 min of service in an oxidizing environment at 1700℃ is as follows. It can be seen that the ZrB2-MoSi2-based antioxidant coating obtained in this embodiment has good phase composition, exhibits a seed coat biomimetic structure in the coating cross-section, and has a good heterogeneous phase interface, thus demonstrating excellent oxidation protection effect in an oxidizing environment at 1700℃.

[0045] Comparative Example 1: The ZrB2-MoSi2-based coating involved in this comparative example is a method for preparing the ZrB2-based coating powder source of mechanically mixed SiO2 glass, which is carried out according to the following steps: (1) ZrB2-MoSi2 powder was prepared by combustion synthesis and then crushed, ground and sieved for later use.

[0046] (2) SiO2 glass is used as raw material. It and ZrB2-MoSi2 powder are put into an agate ball mill jar, and milling seeds and alcohol are added for mechanical mixing.

[0047] (3) The obtained mixture is dried and sieved to obtain ZrB2-MoSi2-based antioxidant coating powder source for mechanically mixed SiO2 glass.

[0048] (4) The obtained powder source is spread on the periphery of the graphite substrate and then subjected to low-temperature densification treatment by spark plasma sintering to obtain a ZrB2-MoSi2-based anti-oxidation coating. The densification time is 25 min and the densification temperature is 1270℃.

[0049] The phase structure of the ZrB2-MoSi2-based antioxidant coating of the mechanically mixed SiO2 glass obtained in this embodiment is as follows: Figure 1 As shown, the cross-sectional scanning electron microscope image is as follows: Figure 5 As shown in Table 1, the antioxidant performance after 100 minutes of service in an oxidizing environment at 1700℃ is as follows. Compared with Example 2, this comparative example uses a mechanical mixing method of SiO2 glass, therefore the ZrB2-MoSi2-based antioxidant coating obtained in Comparative Example 2 does not possess the biomimetic characteristics of a seed coat structure. Although the coating obtained in Comparative Example 2 has a good phase structure, there is SiO2 phase segregation and enrichment in the cross-sectional morphology after coating, and the oxidation protection effect in an oxidizing environment at 1700℃ is weaker than that of Examples 1-3.

[0050] Comparative Example 2: The ZrB2-MoSi2-based coating involved in this comparative example is a ZrB2-MoSi2-based coating preparation method without SiO2 glass additives, which is carried out according to the following steps: (1) ZrB2-MoSi2 powder was prepared by combustion synthesis and then crushed, ground and sieved for later use.

[0051] (2) The obtained powder was spread on the periphery of the graphite matrix and then subjected to low-temperature densification treatment by spark plasma sintering to obtain a ZrB2-MoSi2-based anti-oxidation coating. The densification time was 25 min and the densification temperature was 1270℃.

[0052] The phase structure of the ZrB2-MoSi2-based antioxidant coating obtained in this embodiment, which does not contain SiO2 glass, is as follows: Figure 1 As shown, the cross-sectional scanning electron microscope image is as follows: Figure 6 As shown in Table 1, the antioxidant performance after 100 minutes of service in an oxidizing environment at 1700℃ is as follows. Compared with Example 2, this comparative example did not add SiO2 phase, therefore the ZrB2-MoSi2-based antioxidant coating obtained in Comparative Example 2 does not possess the biomimetic characteristics of a seed coat structure and does not contain SiO2. Although the phase structure of the coating obtained in Comparative Example 2 is good, its antioxidant protection effect in an oxidizing environment at 1700℃ is weaker than that of Examples 1-3.

[0053] Performance tests and phase analysis were performed on this embodiment and the comparative example.

[0054] 1. Select a coating sample with a diameter of 15 mm and containing a carbon matrix. The coating thickness is about 1 mm. Test the oxidation weight gain and oxygen permeability of the coating at 1700 degrees. The test results are shown in Table 1.

[0055] Table 1. Results of oxidation weight gain and oxygen permeability of the coating at 1700 degrees Celsius. 2. For example Figure 1 The X-ray diffraction pattern shows that the coating in this embodiment has a pure phase composition, mainly consisting of ZrB2 and MoSi2 phases. No obvious impurity peaks or abnormal reaction product peaks were found, proving that the seed coat structure maintained good chemical stability during the preparation process. Combined with the data in Table 1, it can be seen that after 100 min of service in an oxidizing environment at 1700℃, the oxidative weight gain of the coating in this embodiment was only 0.3232 × 10⁻⁶. -2 g·cm -2 With an oxygen permeability of 99.79%, it exhibits excellent antioxidant properties. In contrast, Comparative Example 1, which uses mechanically mixed SiO2 glass, suffers from uneven component distribution and weak interfacial bonding, resulting in an oxidation weight gain of 0.4862 × 10⁻⁶. -2 g·cm -2 Comparative Example 2, lacking SiO2 component and pre-encapsulation protection, exhibited an oxidation weight gain of 0.8022 × 10⁻⁶. -2 g·cm -2 The above positive and negative comparison results fully demonstrate the necessity and inventiveness of constructing the seed coat structure by the in-situ sol-gel method in this application. This structure effectively overcomes the aggregation and segregation problems caused by mechanical mixing, realizes the synergistic protection of outer layer pre-encapsulation and core in-situ self-healing, and significantly improves the service reliability of the coating under extreme high temperature environments.

[0056] The present invention and its embodiments have been described above. This description is not restrictive. The accompanying drawings are only one embodiment of the present invention. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the spirit of the present invention, such design should fall within the protection scope of the present invention.

Claims

1. A method for preparing a ZrB2-MoSi2-based antioxidant coating, characterized in that, include: (1) ZrB2-MoSi2 powder was prepared by combustion synthesis and then crushed, ground and sieved for later use; (2) Weigh ZrB2-MoSi2 powder and polyethyl silicate according to the mass ratio. Disperse ZrB2-MoSi2 powder in an alcohol-water-alkali mixed solvent and add surfactant for ultrasonic dispersion to obtain ZrB2-MoSi2 powder suspension. Dissolve polyethyl silicate in ethanol to prepare polyethyl silicate dispersion. Add polyethyl silicate silicon source precursor solution to the powder dispersion for hydrolysis reaction. (3) A silicon-containing shell layer is formed on the surface of the ZrB2-MoSi2 powder to obtain a seed coat structure precursor powder; the seed coat structure precursor powder is subjected to vacuum heat treatment to obtain a seed coat structure biomimetic ZrB2-MoSi2-based antioxidant coating powder source. (4) The coating powder source is laid on the substrate surface and densified by spark plasma sintering to obtain a ZrB2-MoSi2-based antioxidant coating.

2. The method for preparing the ZrB2-MoSi2-based antioxidant coating according to claim 1, characterized in that, In step (2), the mass ratio of the ZrB2-MoSi2 powder to the polyethyl silicate is in the range of 3:2 to 5:

2.

3. The method for preparing the ZrB2-MoSi2-based antioxidant coating according to claim 1, characterized in that, In step (2), the surfactant is tetrabutylammonium bromide, and the concentration range of tetrabutylammonium bromide in the solvent is 2 g / L to 6 g / L.

4. The method for preparing the ZrB2-MoSi2-based antioxidant coating according to claim 1, characterized in that, In step (2), the volume ratio of polyethyl silicate to ethanol is 1:

30.

5. The method for preparing the ZrB2-MoSi2-based antioxidant coating according to claim 1, characterized in that, In step (2), the silicon source precursor solution is added dropwise to the powder dispersion by a peristaltic pump at a rate of 5 ml / min to 10 ml / min. After the addition is complete, the mixture is left to stand for 6 hours. At the same time, magnetic stirring is turned on.

6. The method for preparing the ZrB2-MoSi2-based antioxidant coating according to claim 1, characterized in that, In step (3), the temperature range of the vacuum heat treatment is 300℃~380℃, and the heat treatment time range is 80min~100min.

7. The method for preparing the ZrB2-MoSi2-based antioxidant coating according to claim 1, characterized in that, The densification temperature range of the discharge plasma sintering is 1250℃~1280℃, and the densification time range is 20min~30min.

8. The method for preparing the ZrB2-MoSi2-based antioxidant coating according to claim 1, characterized in that, The alcohol-water-alkali mixed solvent is a mixed solution of anhydrous ethanol, distilled water and ammonia; the volume ratio of the anhydrous ethanol, the distilled water and the ammonia is 12:7:

2.

9. A ZrB2-MoSi2-based antioxidant coating, characterized in that, The coating is prepared by the method described in any one of claims 1 to 8. The ZrB2-MoSi2-based antioxidant coating contains multiple seed coat structure particles, which include: a core phase composed of ZrB2 and MoSi2; and a shell phase composed of silicon oxide, wherein the shell phase uniformly covers the surface of the core phase.

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