Ultrahigh-temperature thermal protection powder coating, ultrahigh-temperature thermal protection coating as well as preparation method and application of ultrahigh-temperature thermal protection powder coating

Abstract

The invention belongs to the technical field of thermal protection coatings, and particularly relates to an ultra-high-temperature thermal protection powder coating, an ultra-high-temperature thermal protection coating and a preparation method and application of the ultra-high-temperature thermal protection powder coating. The invention provides an ultrahigh-temperature thermal protection powder coating. The ultrahigh-temperature thermal protection powder coating is prepared from transition metal boride, silicon carbide and metal carbide. The mass ratio of the transition metal boride to the silicon carbide is 9: (1-3); the metal carbide accounts for 5-35% of the total mass of the transition metal boride, the silicon carbide and the metal carbide. According to the ultrahigh-temperature thermal protection powder coating provided by the invention, the metal carbide is added into the transition metal boride-silicon carbide composite coating, the carbide has ablation resistance, and an oxidation product formed after oxidation of the metal boride and / or the metal carbide has a synergistic anti-oxidation effect, so that a high-melting-point compound can be obtained; therefore, the anti-ablation effect is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal protective coatings, and in particular relates to an ultra-high temperature thermal protective powder coating, an ultra-high temperature thermal protective coating, and a preparation method and application thereof. Background Art

[0002] With the rapid development and technological breakthroughs of hypersonic vehicles, the flight environment they face is becoming increasingly extreme, especially the oxidation and ablation environment experienced by windward structural parts made of carbon-carbon composite materials is becoming increasingly severe. The main coping strategy at present is to prepare an anti-oxidation and ablation coating on the surface of the structural parts.

[0003] However, due to the continuous improvement of index requirements, the service temperature of aircraft is constantly increasing, and the surface temperature of aircraft can reach above 2000℃. The traditional boride-silicon carbide binary coating will fail above 1800℃ due to the volatilization of silicon dioxide and cannot provide sufficient thermal protection for aircraft. Therefore, it is urgent to study a coating material that can achieve effective thermal protection at extremely high temperatures. Summary of the invention

[0004] The purpose of the present invention is to provide an ultra-high temperature thermal protective powder coating, an ultra-high temperature thermal protective coating and a preparation method and application thereof. The ultra-high temperature thermal protective powder coating provided by the present invention has excellent high temperature ablation resistance.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides an ultra-high temperature heat protection powder coating, the preparation raw materials of which include transition metal boride, silicon carbide and transition metal carbide;

[0007] The mass ratio of the transition metal boride to silicon carbide is 9:1-3;

[0008] The transition metal carbide accounts for 5-35% of the total mass of the transition metal boride, silicon carbide and transition metal carbide.

[0009] Preferably, the transition metal boride comprises HfB2 and / or ZrB2;

[0010] The transition metal carbide includes one or more of HfC, TaC, ZrC and TiC.

[0011] Preferably, the preparation raw materials also include water;

[0012] The solid-liquid mass ratio of the preparation raw materials is 1:4-5.5.

[0013] Preferably, the preparation raw materials further include a binder; the binder is polyvinyl alcohol;

[0014] The binder accounts for 0.4-0.8% of the total mass of the raw materials.

[0015] Preferably, the particle size of the ultra-high temperature heat protection powder coating is 30 to 80 μm.

[0016] The present invention also provides a method for preparing the ultra-high temperature heat protection powder coating described in the above technical solution, comprising the following steps:

[0017] mixing transition metal boride, silicon carbide, transition metal carbide and water to obtain a slurry;

[0018] The slurry is spray-dried to obtain agglomerated powder;

[0019] The agglomerated powder is subjected to induction plasma spheroidization to obtain the ultra-high temperature heat protection powder coating.

[0020] Preferably, the inlet temperature of the spray drying is 240-280° C., the outlet temperature is 125-160° C., the rotation speed of the spray head is 35-50 rpm, and the frequency of the peristaltic pump is 30-45 Hz.

[0021] Preferably, the argon flow rate of the induction plasma spheroidization is 55-65 slpm, the hydrogen flow rate is 4-8 slpm, the processing chamber pressure is 11-20 psig, and the powder feeder frequency is 25-35 g / min.

[0022] The present invention also provides an ultra-high temperature thermal protective coating, and the preparation method of the ultra-high temperature thermal protective coating comprises the following steps:

[0023] The ultra-high temperature heat protection powder coating is subjected to atmospheric plasma spraying to obtain the ultra-high temperature heat protection coating; the ultra-high temperature heat protection powder coating is the ultra-high temperature heat protection powder coating described in the above technical scheme or the ultra-high temperature heat protection powder coating obtained by the preparation method described in the above technical scheme.

[0024] The present invention also provides the use of the ultra-high temperature heat protective powder coating described in the above technical scheme, the ultra-high temperature heat protective powder coating obtained by the preparation method described in the above technical scheme, or the ultra-high temperature heat protective coating described in the above technical scheme in aircraft structural parts, missile fronts or the inner walls of industrial kilns.

[0025] The present invention provides an ultra-high temperature heat protection powder coating, the raw materials for preparation include transition metal boride, silicon carbide and transition metal carbide; the mass ratio of the transition metal boride to silicon carbide is 9:1-3; the transition metal carbide accounts for 5-35% of the total mass of the transition metal boride, silicon carbide and transition metal carbide. The ultra-high temperature heat protection powder coating provided by the present invention is prepared by adding transition metal carbide to the transition metal boride-silicon carbide composite coating, wherein the carbide has ablation resistance, and the oxidation product formed after the oxidation of the metal boride and / or the metal carbide has a synergistic antioxidant effect, and a high melting point compound can be obtained, thereby realizing the improvement of the anti-ablation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 This is a surface SEM image of the ultra-high temperature thermal protection coating obtained in Example 1;

[0028] Figure 2 This is a surface SEM image of the ultra-high temperature thermal protection coating obtained in Example 2;

[0029] Figure 3 This is a surface SEM image of the ultra-high temperature thermal protection coating obtained in Example 3;

[0030] Figure 4 This is a surface SEM image of the ultra-high temperature thermal protection coating obtained in Example 4;

[0031] Figure 5 This is a macroscopic morphology of the ultra-high temperature thermal protection coating obtained in Example 1;

[0032] Figure 6 This is a macroscopic morphology of the ultra-high temperature thermal protection coating obtained in Example 2;

[0033] Figure 7 This is a macroscopic morphology of the ultra-high temperature thermal protective coating obtained in Example 3;

[0034] Figure 8 This is a macroscopic morphology of the ultra-high temperature thermal protection coating obtained in Example 4;

[0035] Fig. 9 This is a macroscopic morphology of the ultra-high temperature thermal protection coating obtained in Comparative Example 1;

[0036] Fig.10This is a surface SEM image of the ultra-high temperature thermal protection coating obtained in Example 1 after 60 seconds of ablation test;

[0037] Fig.11 This is a surface SEM image of the ultra-high temperature thermal protection coating obtained in Example 2 after 60 seconds of ablation test;

[0038] Fig.12 This is a surface SEM image of the ultra-high temperature thermal protection coating obtained in Example 3 after 60 seconds of ablation test;

[0039] Fig.13 This is a macroscopic morphology of the ultra-high temperature thermal protection coating obtained in Example 2 after 120s of ablation test;

[0040] Fig.14 This is the surface SEM image of the ultra-high temperature thermal protection coating obtained in Example 2 after 120s of ablation test. DETAILED DESCRIPTION

[0041] The present invention provides an ultra-high temperature heat protection powder coating, the preparation raw materials of which include transition metal boride, silicon carbide and transition metal carbide;

[0042] The mass ratio of the transition metal boride to silicon carbide is 9:1-3;

[0043] The transition metal carbide accounts for 5-35% of the total mass of the transition metal boride, silicon carbide and transition metal carbide.

[0044] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0045] In the present invention, the transition metal boride preferably includes HfB2 and / or ZrB2, and more preferably HfB2; the mass ratio of the transition metal boride to silicon carbide is 9:1 to 3, and preferably 9:1.2 to 2.5.

[0046] In the present invention, the transition metal carbide preferably includes one or more of HfC, TaC, ZrC and TiC, more preferably TaC and / or TiC, and most preferably TaC and TiC; when the transition metal carbide is TaC and TiC, the mass ratio of TaC to TiC is preferably 1:0.2-3.5, more preferably 1:0.3-2; the transition metal carbide accounts for 5-35% of the total mass of the transition metal boride, silicon carbide and transition metal carbide, preferably 10-30%, and more preferably 20-30%.

[0047] In the present invention, the particle sizes of the transition metal boride, silicon carbide and transition metal carbide are independently preferably 1 to 3 μm, more preferably 1 to 2 μm.

[0048] In the present invention, the raw materials for preparation preferably further include water; the water is preferably deionized water; the solid-liquid mass ratio of the raw materials for preparation is preferably 1:4-5.5, more preferably 1:4-5.

[0049] In the present invention, the raw materials for preparation preferably further include a binder; the binder is preferably polyvinyl alcohol; the binder preferably accounts for 0.4 to 0.8% of the total mass of the raw materials for preparation, and more preferably 0.4 to 0.6%.

[0050] In the present invention, the particle size of the ultra-high temperature heat protection powder coating is preferably 30 to 80 μm, more preferably 40 to 75 μm.

[0051] The ultra-high temperature heat protection powder coating provided by the present invention is prepared by adding transition metal carbides to transition metal boride-silicon carbide composite coatings, wherein the carbides have ablation resistance, and the metal boride and / or metal carbides are oxidized to form oxidation products, and these metal oxides react with each other to form high melting point compounds, such as hafnium oxide and titanium oxide to form hafnium titanate, and hafnium oxide and tantalum pentoxide to form Hf6Ta2O 17 Etc., utilizing the high melting point and high oxygen barrier properties of these high melting point compounds to enhance the coating's ability to resist oxidation and ablation.

[0052] The present invention also provides a method for preparing the ultra-high temperature heat protection powder coating described in the above technical solution, comprising the following steps:

[0053] mixing transition metal boride, silicon carbide, transition metal carbide and water to obtain a slurry;

[0054] The slurry is spray-dried to obtain agglomerated powder;

[0055] The agglomerated powder is subjected to induction plasma spheroidization to obtain the ultra-high temperature heat protection powder coating.

[0056] The invention mixes transition metal boride, silicon carbide, transition metal carbide and water to obtain slurry.

[0057] In the present invention, the mixture preferably further includes a binder.

[0058] In the present invention, the mixing is preferably ball milling; the material-to-ball ratio of the ball milling is preferably 3:1-2, more preferably 3:1.5-2; the time is preferably 6-8h, more preferably 7-8h.

[0059] In the present invention, the function of the ball mill is to fully mix the slurry to form a slurry with uniform composition.

[0060] After obtaining the slurry, the present invention spray-dries the slurry to obtain agglomerated powder.

[0061] In the present invention, the inlet temperature of the spray drying is preferably 240-280°C, more preferably 250-270°C; the outlet temperature is preferably 125-160°C, more preferably 130-150°C; the spray head speed is preferably 35-50rpm, more preferably 40-45rpm; the peristaltic pump frequency is preferably 30-45Hz, more preferably 35-40Hz.

[0062] In the present invention, the role of the spray drying is to form agglomerated powders through overlapping action of the powder raw materials, which is convenient for the subsequent spheroidization step. Spray drying has the characteristics of fast speed, controllable powder characteristics, high production efficiency, etc.

[0063] In the present invention, the particle size of the agglomerated powder is preferably 30 to 80 μm, more preferably 40 to 75 μm.

[0064] After obtaining the agglomerated powder, the present invention performs induction plasma spheroidization on the agglomerated powder to obtain the ultra-high temperature heat protection powder coating.

[0065] In the present invention, the argon flow rate of the induction plasma spheroidization is preferably 55-65slpm, more preferably 58-62slpm; the hydrogen flow rate is preferably 4-8slpm, more preferably 5-7slpm; the processing chamber pressure is preferably 11-20psig, more preferably 15-20psig; the powder feeder frequency is preferably 25-35g / min, more preferably 28-32g / min.

[0066] In the present invention, the binder is removed during the induction plasma spheroidization process.

[0067] In the present invention, the role of the induction plasma spheroidization is to increase the compactness of the sprayed powder and improve the quality of the coating formed in the subsequent spraying process.

[0068] The preparation method provided by the invention can obtain ultra-high temperature heat protection powder coating with good fluidity and high density.

[0069] The present invention also provides an ultra-high temperature thermal protective coating, and the preparation method of the ultra-high temperature thermal protective coating comprises the following steps:

[0070] The ultra-high temperature heat protection powder coating is subjected to atmospheric plasma spraying to obtain the ultra-high temperature heat protection coating; the ultra-high temperature heat protection powder coating is the ultra-high temperature heat protection powder coating described in the above technical scheme or the ultra-high temperature heat protection powder coating obtained by the preparation method described in the above technical scheme.

[0071] In the present invention, the current of the atmospheric plasma spraying is preferably 750-850A, more preferably 780-820A; the main gas flow rate is preferably 35-45lpm, more preferably 38-42lpm; the auxiliary gas flow rate is preferably 1-3lpm, more preferably 2-3lpm; the carrier gas flow rate is preferably 3-4lpm, more preferably 3-3.5lpm; the powder feeding rate is preferably 3-5RPM, more preferably 4-5RPM; the spraying distance is preferably 60-80cm, more preferably 65-75cm.

[0072] In the present invention, the thickness of the ultra-high temperature thermal protective coating is preferably 200-300 μm, more preferably 220-280 μm.

[0073] The ultra-high temperature thermal protective coating provided by the present invention has the characteristics of high density and excellent anti-ablation performance.

[0074] The present invention also provides the use of the ultra-high temperature heat protective powder coating described in the above technical scheme, the ultra-high temperature heat protective powder coating obtained by the preparation method described in the above technical scheme, or the ultra-high temperature heat protective coating described in the above technical scheme in aircraft structural parts, missile fronts or the inner walls of industrial kilns.

[0075] The present invention does not have any special limitation on the application process of the ultra-high temperature thermal protective coating in aircraft structural parts, missile fronts or industrial furnace inner walls, and can be applied in a manner familiar to those skilled in the art.

[0076] In order to further illustrate the present invention, the ultra-high temperature thermal protective powder coating, ultra-high temperature thermal protective coating, and preparation method and application thereof provided by the present invention are described in detail below in combination with the accompanying drawings and embodiments, but they should not be understood as limiting the scope of protection of the present invention.

[0077] Example 1

[0078] Hafnium boride, silicon carbide, TiC, TaC, PVA and water are mixed, wherein the mass ratio of hafnium boride to silicon carbide is 630:128, TiC accounts for 5.8wt% of the total mass of hafnium boride, silicon carbide and metal carbides, TaC accounts for 16.28wt% of the total mass of hafnium boride, silicon carbide and metal carbides, PVA accounts for 0.4wt% of the raw material mass, the solid-liquid ratio of the mixture is 1:4, the material-ball ratio is 8:5, and the slurry is obtained by ball milling for 7h;

[0079] The slurry was spray dried at an inlet temperature of 250°C, an outlet temperature of 150°C, a spray head speed of 40 rpm, and a peristaltic pump frequency of 40 Hz to obtain agglomerated powder;

[0080] The agglomerated powder was subjected to induction plasma spheroidization, with an argon flow rate of 60 slpm, a hydrogen flow rate of 5 slpm, a processing chamber pressure of 18 psig, and a powder feeder frequency of 31.8 g / min to obtain an ultra-high temperature heat protection powder coating;

[0081] The powder coating was subjected to atmospheric plasma spraying with a current of 800A, a main gas of 40lpm, an auxiliary gas of 2lpm, a carrier gas of 3lpm, a powder feeding rate of 4RPM, a spraying distance of 70cm, and a coating thickness of 250μm to obtain the ultra-high temperature thermal protective coating.

[0082] Example 2

[0083] Hafnium boride, silicon carbide, TiC, TaC, PVA and water are mixed, wherein the mass ratio of hafnium boride to silicon carbide is 630:128, TiC accounts for 12.2wt% of the total mass of hafnium boride, silicon carbide and metal carbide, TaC accounts for 16.8wt% of the total mass of hafnium boride, silicon carbide and metal carbide, PVA accounts for 0.4wt% of the raw material mass, the solid-liquid ratio of the mixture is 1:4, the material-ball ratio is 8:5, and the slurry is obtained by ball milling for 7h;

[0084] The slurry was spray dried at an inlet temperature of 250°C, an outlet temperature of 150°C, a spray head speed of 45 rpm, and a peristaltic pump frequency of 40 Hz to obtain agglomerated powder;

[0085] The agglomerated powder was subjected to induction plasma spheroidization, with an argon flow rate of 60 slpm, a hydrogen flow rate of 5 slpm, a processing chamber pressure of 18 psig, and a powder feeder frequency of 32 g / min to obtain an ultra-high temperature heat protection powder coating;

[0086] The powder coating was subjected to atmospheric plasma spraying with a current of 800A, a main gas of 40lpm, an auxiliary gas of 2lpm, a carrier gas of 3lpm, a powder feeding rate of 4RPM, a spraying distance of 70cm, and a coating thickness of 250μm to obtain the ultra-high temperature thermal protective coating.

[0087] Example 3

[0088] An ultra-high temperature heat protection powder coating and a coating are prepared according to the preparation method provided in Example 1, except that TiC accounts for 18.89 wt % of the total mass of hafnium boride, silicon carbide and metal carbide.

[0089] Example 4

[0090] An ultra-high temperature heat protection powder coating and coating are prepared according to the preparation method provided in Example 1, except that TiC is not added and TaC accounts for 15.68 wt % of the total mass of hafnium boride, silicon carbide and metal carbide.

[0091] Comparative Example 1

[0092] The powder coating and the coating were prepared according to the preparation method provided in Example 1, except that hafnium boride was replaced with zirconium boride, and no metal carbide was added.

[0093] Test Example 1

[0094] The microstructure of the obtained ultra-high temperature thermal protection coating was observed by scanning electron microscopy. The SEM images of the coating surfaces corresponding to Examples 1 to 4 are shown in Figures 1 to 4 .

[0095] Depend on Figures 1 to 4 It can be seen that the coating surface presents obvious APS characteristics, with ups and downs on the surface, and no obvious holes and through cracks. Among them, the ultra-high temperature thermal protective coatings obtained in Examples 1 to 3 are more dense than Example 4.

[0096] Test Example 2

[0097] The thermal protective coatings obtained in Examples 1 to 4 and Comparative Example 1 were subjected to oxyacetylene flame ablation test at 2000° C. for 60 seconds. The ablation rate data of the ultra-high temperature thermal protective coatings obtained in Examples 1 to 4 are shown in Table 1. The macroscopic morphology of the thermal protective coatings obtained in Examples 1 to 4 and Comparative Example 1 after the test is shown in Table 1. Figures 5 to 9 The surface SEM images of the ultra-high temperature thermal protection coatings obtained in Examples 1 to 3 after evaluation are shown in Figures 10-12 .

[0098] Table 1 Ablation rate data of ultra-high temperature thermal protective coatings obtained in Examples 1 to 4

[0099] Ablation time(s) Linear ablation rate (mm / s) Mass ablation rate (g / s) Example 1 60 <![CDATA[-3.167×10 -3 ]]> <![CDATA[3.98333×10 -4 <!-- 5 -->]]> Example 2 60 <![CDATA[-1.15×10 -3 ]]> <![CDATA[3.96×10 -4 ]]> Example 3 60 <![CDATA[-8.5×10 -4 ]]> <![CDATA[3.05×10 -4 ]]> Example 4 60 <![CDATA[2×10 -4 ]]> <![CDATA[1.95×10 -3 ]]>

[0100] From Table 1 and Figures 5 to 8 It can be seen that the whitish edges of the ultra-high temperature thermal protective coatings obtained in Examples 1 to 3 are the color of oxides such as hafnium oxide, and the black color is the color produced by titanium oxide. The coatings are intact and undamaged, and can achieve thermal protection at 2000°C; the ultra-high temperature thermal protective coating obtained in Example 4 is white, because it does not contain titanium and does not have the black morphology in the example. The coating remains intact and undamaged, and can achieve thermal protection at 2000°C; among them, the ablation rates of Examples 2 to 3 are lower than those of Example 1, and they have better ablation resistance; the ablation resistance of Example 4 is lower than that of Example 1.

[0101] Depend on Fig. 9 It can be seen that the thermal protection coating obtained in Comparative Example 1 has been damaged at 2000°C.

[0102] Depend on Figures 10-12It can be seen that the surfaces of the ultra-high temperature thermal protective coatings obtained in Examples 1 and 2 have pores caused by ablation and cracks caused by thermal stress. Among them, on the surface of the ultra-high temperature thermal protective coating obtained in Example 2, with the increase of TiC content, the proportion of dense surface filling phase increases, because Ti has the function of stabilizing the SiO2 glass phase, and TiO2 itself can also serve as a filling phase; the surface of the ultra-high temperature thermal protective coating obtained in Example 3 has pores caused by ablation, and the surface contains more glass phases with protective properties.

[0103] Test Example 3

[0104] The ultra-high temperature thermal protection coating obtained in Example 2 was subjected to oxyacetylene flame ablation test at 2000°C for 120s. The macroscopic morphology is shown in Fig.13 , surface SEM image see Fig.14 .

[0105] The linear ablation rate of the coating is -1.01×10 -3 mm / s, and the mass ablation rate is 6.09×10 -4 g / s, which is higher than that of Example 1. This is because a large amount of glass phase volatilizes as the ablation time increases.

[0106] Depend on Fig.13 It can be seen that the white edge of the ultra-high temperature thermal protection coating obtained in Example 2 is the color of oxides such as hafnium oxide, and the black color is the color produced by titanium oxide. The coating is intact and can achieve thermal protection under 2000°C conditions.

[0107] Depend on Fig.14 It can be seen that with the increase of ablation time, the coating surface gradually becomes smoother and the surface glass phase content decreases.

[0108] Although the above embodiment describes the present invention in detail, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, and these embodiments all fall within the protection scope of the present invention.

Claims

1. An ultra-high temperature heat protection powder coating, characterized in that: The preparation raw materials include transition metal boride, silicon carbide and transition metal carbide; The mass ratio of the transition metal boride to silicon carbide is 9:1-3; The transition metal carbide accounts for 5-35% of the total mass of the transition metal boride, silicon carbide and transition metal carbide.

2. The ultra-high temperature heat protection powder coating according to claim 1, characterized in that: The transition metal boride comprises HfB2 and / or ZrB2; The transition metal carbide includes one or more of HfC, TaC, ZrC and TiC.

3. The ultra-high temperature heat protection powder coating according to claim 1, characterized in that: The preparation raw materials also include water; The solid-liquid mass ratio of the preparation raw materials is 1:4-5.

5.

4. The ultra-high temperature heat protection powder coating according to claim 3, characterized in that: The preparation raw materials also include a binder; the binder is polyvinyl alcohol; The binder accounts for 0.4-0.8% of the total mass of the raw materials.

5. The ultra-high temperature heat protection powder coating according to any one of claims 1 to 4, characterized in that: The particle size of the ultra-high temperature heat protection powder coating is 30 to 80 μm.

6. The method for preparing the ultra-high temperature heat protection powder coating according to any one of claims 1 to 5, characterized in that: The following steps are involved: mixing transition metal boride, silicon carbide, transition metal carbide and water to obtain a slurry; The slurry is spray-dried to obtain agglomerated powder; The agglomerated powder is subjected to induction plasma spheroidization to obtain the ultra-high temperature heat protection powder coating.

7. The preparation method according to claim 6, characterized in that: The inlet temperature of the spray drying is 240-280° C., the outlet temperature is 125-160° C., the rotation speed of the spray head is 35-50 rpm, and the frequency of the peristaltic pump is 30-45 Hz.

8. The preparation method according to claim 6, characterized in that: The argon flow rate of the induction plasma spheroidization is 55-65 slpm, the hydrogen flow rate is 4-8 slpm, the processing chamber pressure is 11-20 psig, and the powder feeder frequency is 25-35 g / min.

9. An ultra-high temperature thermal protective coating, characterized in that: The method for preparing the ultra-high temperature thermal protective coating comprises the following steps: The ultra-high temperature thermal protective powder coating is subjected to atmospheric plasma spraying to obtain the ultra-high temperature thermal protective coating; the ultra-high temperature thermal protective powder coating is the ultra-high temperature thermal protective powder coating according to any one of claims 1 to 5 or the ultra-high temperature thermal protective powder coating obtained by the preparation method according to any one of claims 6 to 8.

10. Use of the ultra-high temperature heat protection powder coating according to any one of claims 1 to 5, the ultra-high temperature heat protection powder coating obtained by the preparation method according to any one of claims 6 to 8, or the ultra-high temperature heat protection coating according to claim 9 in aircraft structural parts, missile fronts or industrial furnace inner walls.

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