High-temperature-resistant radar stealth repair coating, preparation method and application thereof

Abstract

The application belongs to the technical field of high-temperature wave-absorbing coating materials, and particularly relates to a high-temperature radar stealth coating for repairing, a preparation method and application, especially application to a radar stealth coating for repairing a damaged surface of weapon equipment at a working temperature of 900 DEG C to 1000 DEG C. The coating is composed of glass powder A, glass powder B, ceramic radar absorber and diluent, and the mass ratio is (1-2):(0.5-1.5):(0.5-1):(1-2). The coating has good radar stealth performance and wave-absorbing performance, and when applied to preparation of the high-temperature radar stealth coating, the coating preparation period is short, the damaged coating can be quickly repaired in the field environment, and the problems of equipment transportation, assembly and debugging difficulty and long coating preparation period in plasma spraying preparation of the high-temperature stealth coating are solved.

Description

A high-temperature resistant radar stealth coating for repair, its preparation method and application Technical Field

[0001] This invention belongs to the technical field of high-temperature radar-absorbing coating materials, specifically relating to a high-temperature resistant radar stealth coating for repair, its preparation method and application, especially for repairing radar stealth coatings damaged on the surface of weapons and equipment with operating temperatures of 900℃~1000℃. Background Technology

[0002] In recent years, with the rapid development of radar detection technology, it has posed a great threat to weapons and equipment. Countries around the world are making every effort to develop radar stealth technology in order to improve the survivability of weapons and equipment.

[0003] Electromagnetic absorbing coatings are a class of stealth materials that can attenuate incident electromagnetic waves and dissipate their electromagnetic energy by converting it into heat energy or causing the electromagnetic waves to disappear due to interference. They are widely used in military, aviation, aerospace, communications and electronics fields, such as for the stealth of weapons and equipment like fighter jets and supersonic cruise missiles.

[0004] Currently, the high-temperature absorbing coatings successfully applied to weapon components are mainly prepared using plasma spraying technology. While this technology produces coatings with excellent mechanical and environmental resistance, it is not suitable for field repair. Furthermore, when small areas of coating damage occur on weapon components, returning them to the factory to re-prepare a new coating is not only complex but also wasteful of materials and time. To achieve rapid repair of damaged coating areas in outdoor environments, the advantages of localized brushing, stable and controllable curing processes, simple and portable equipment, and coating preparation processes unaffected by outdoor environments have attracted significant attention. Therefore, rapid field repair technology for radar stealth coatings has become particularly important. Moreover, existing radar stealth coatings generally have poor high-temperature resistance and are not suitable for repairing radar stealth coatings damaged on weapon surfaces operating at temperatures between 900℃ and 1000℃.

[0005] In view of this, the inventors provide a high-temperature resistant radar stealth coating for repair, a preparation method, and its application to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and propose a high-temperature resistant radar stealth coating for repair, its preparation method, and its application. The coating uses glass powder A, glass powder B, ceramic radar absorber, and diluent. By rationally controlling the ratio of each component, the coating has good radar stealth performance and wave absorption performance. The coating is applied to the preparation of a high-temperature resistant radar stealth coating using brushing technology and curing process, so as to realize the on-site repair of the damaged coating and make the repaired coating have good radar stealth performance, mechanical properties, and thermal shock resistance.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] On one hand, the present invention provides a high-temperature resistant radar stealth coating for repair, the coating being composed of glass powder A, glass powder B, ceramic radar absorber and diluent, in a mass ratio of (1-2):(0.5-1.5):(0.5-1):(1-2); the initial melting temperature of glass powder B is higher than that of glass powder A, and the initial melting temperature of glass powder B is less than or equal to 850°C.

[0009] Preferably, the mass ratio of glass powder A, glass powder B, ceramic radar absorber, and diluent is 1.5:1:0.5:(1-1.5). At this ratio, the coating, after curing, exhibits high surface smoothness and low porosity.

[0010] Furthermore, the initial melting temperature of glass powder A is 350℃~500℃, and the initial melting temperature of glass powder B is 700℃~850℃.

[0011] Preferably, the initial melting temperature of the glass powder B is 750℃~850℃.

[0012] Furthermore, the ceramic radar absorber is Sm 0.9 Sr 0.1 Al 0.5 Co 0.5 O3 powder, wherein the diluent is a volatile diluent.

[0013] Preferably, the volatile diluent is anhydrous ethanol. It should be noted that adding a volatile diluent not only ensures uniform mixing with other components but also allows for surface drying at room temperature within a short time, preventing the paint from splashing due to the sudden evaporation of a large amount of diluent at high temperatures. Furthermore, anhydrous ethanol is preferred because it has stable physicochemical properties and does not react with other components.

[0014] On the other hand, the present invention also provides a method for preparing the high-temperature resistant radar stealth coating for repair as described above, specifically including the following steps:

[0015] S1. Weigh glass powder A, glass powder B, ceramic radar absorber and diluent according to the mass ratio (1~2):(0.5~1.5):(0.5~1):(1~2);

[0016] S2. First, manually stir and mix the glass powder A, glass powder B, ceramic radar absorber and diluent weighed in S1 with a spatula until there is no sediment. Then, stir with a disperser for a set time until the mixture is uniform to obtain the high-temperature resistant radar stealth coating for repair.

[0017] Furthermore, in S2, a diluent is added during the mixing process in the disperser, so that the mass ratio of glass powder A, glass powder B, ceramic radar absorber, and diluent is (1-2):

[0018] Within the range of (0.5~1.5)∶(0.5~1)∶(1~2);

[0019] The speed of the disperser is set to 1000 r / min to 1500 r / min, and the stirring time of the disperser is set to 3 min to 5 min.

[0020] It should be noted that since the diluent will continuously evaporate during the mixing process, it is necessary to add the diluent in a timely manner during the dispersing process to ensure that the mass ratio of glass powder A, glass powder B, ceramic radar absorber and diluent is maintained within the range of (1~2):(0.5~1.5):(0.5~1):(1~2).

[0021] Furthermore, the speed of the disperser is set to 1000 r / min to 1500 r / min, and the stirring time of the disperser is set to 3 min to 5 min.

[0022] In another aspect, the present invention also provides the application of the repair-grade high-temperature radar stealth coating as described above in the preparation of high-temperature radar stealth coatings.

[0023] Furthermore, the process for preparing the high-temperature resistant radar stealth coating is as follows:

[0024] (a) Substrate pretreatment: Sandblast the area to be repaired on the surface of the substrate until the surface roughness of the area to be repaired reaches the set value.

[0025] (b) Preparation of high temperature radar stealth coating: The coating is applied to the area to be repaired after sandblasting by brushing and cured to form a high temperature radar stealth coating. The high temperature radar stealth coating is smoothly transitioned to the non-repaired area on the substrate surface.

[0026] Further, in (a), the surface roughness of the area to be repaired is 5 μm to 15 μm.

[0027] Furthermore, the brushing treatment method and curing process in (b) are as follows:

[0028] First, the coating is evenly brushed onto the area to be repaired after sandblasting until the thickness of the coating is greater than the thickness of the non-repaired area on the substrate surface. Then, it is left at room temperature for 10 to 30 minutes to allow the coating to reach a surface dry state. Then, the substrate is kept at 900°C to 1000°C for 30 to 60 minutes using a heating device to obtain a high-temperature radar stealth coating.

[0029] Specifically, the heating device is any one of a hot air gun, a quartz heating lamp, or a resistance furnace.

[0030] Furthermore, the surface of the high-temperature radar stealth coating is polished until it is smooth to ensure a smooth transition between the high-temperature radar stealth coating and the non-repaired area of ​​the substrate surface.

[0031] Among them, the step difference between the polished high-temperature radar stealth coating and the unrepaired area on the substrate surface is ≤0.5mm.

[0032] Specifically, the polishing tool is at least one of sandpaper, file, electric polishing tool, and pneumatic polishing tool.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1) This invention discloses a high-temperature resistant radar stealth coating for repair. The coating comprises glass powder A, glass powder B, a ceramic radar absorber, and a diluent. Glass powder A and glass powder B have low initial melting temperatures, thus exhibiting both high-temperature melting properties and certain fluidity and viscosity. In high-temperature environments, these two glass powders achieve excellent high-temperature impact resistance through continuous cracking and flow. Therefore, both glass powder A and glass powder B are well compatible with high-temperature substrates. The low initial melting temperature of the glass powders and the ceramic radar absorber ensures chemical stability and non-reaction at high temperatures, guaranteeing stable radar absorption performance of the ceramic radar absorber at high temperatures. Thus, by rationally controlling the proportions of each component, the coating achieves excellent radar stealth and radar absorption performance.

[0035] 2) The present invention relates to the application of a high-temperature resistant radar stealth coating for repair. It is used in the preparation of high-temperature resistant radar stealth coatings. The coating of the present invention is formed by brushing and curing. The brushing process is used for preparation, which requires simple tools and equipment. After brushing, the coating can be obtained by curing. The coating preparation cycle is short, which can realize the rapid repair of damaged coatings in the field environment. It solves the problems of difficult equipment transportation, assembly and debugging and long coating preparation cycle in the preparation of high-temperature stealth coatings by plasma spraying.

[0036] 3) The present invention relates to the application of a high-temperature resistant radar stealth coating for repair. It is used in the preparation of a high-temperature resistant radar stealth coating. The prepared high-temperature resistant radar stealth coating has been verified in practice. Under a high temperature environment of 900℃~1000℃, the coating material did not show any abnormal phenomena such as delamination, cracking, or peeling, and has high reliability. Attached Figure Description

[0037] The accompanying drawings are incorporated in and form part of this specification, and together with the description serve to explain the principles of the invention.

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 is a flowchart illustrating the application of the high-temperature resistant radar stealth coating of the present invention in the preparation of a high-temperature resistant radar stealth coating.

[0040] Figure 2 is a physical appearance of the GH3128 substrate after repair in Embodiment 1 of the present invention;

[0041] Figure 3 shows the physical appearance of the GH3128 substrate of Embodiment 1 of the present invention after the repaired area has undergone 100 cycles of air cooling thermal shock at 1000°C.

[0042] Figure 4 is an image of the overall coating appearance of the GH5188 substrate after repair in Embodiment 3 of the present invention.

[0043] Figure 5 is a reflection loss curve of the overall coating of the GH5188 substrate after repair of the area to be repaired in Embodiment 3 of the present invention at 900℃. Detailed Implementation

[0044] Exemplary embodiments will now be described in detail. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses consistent with some aspects of the invention as detailed in the appended claims.

[0045] Example 1

[0046] Referring to Figure 1, an embodiment of the present invention provides a high-temperature resistant radar stealth coating for repair. The coating is composed of glass powder A, glass powder B, ceramic radar absorber and diluent, with a mass ratio of 1.5:1:0.5:1.

[0047] Furthermore, the initial melting temperature of glass powder A is 350℃, the initial melting temperature of glass powder B is 750℃, and the ceramic radar absorber is Sm 0.9 Sr 0.1 Al 0.5 Co 0.5 O3 powder, the diluent is anhydrous ethanol. Specifically, glass powder A is product GT35 sold by Anmi Micro-Nano New Materials (Guangzhou) Co., Ltd., and glass powder B is product GT75 sold by Anmi Micro-Nano New Materials (Guangzhou) Co., Ltd.

[0048] This invention also provides a method for preparing the high-temperature resistant radar stealth coating for repair as described above, specifically including the following steps:

[0049] S1. Weigh GT35, GT75, and Sm according to a mass ratio of 1.5:1:0.5:1. 0.9 Sr 0.1 Al 0.5 Co 0.5 O3 powder and anhydrous ethanol;

[0050] S2. First, manually stir and mix the raw materials weighed in S1 with a spatula until there is no sediment. Then, use a homogenizer to stir at a speed of 1000r / min for 3 minutes until the mixture is uniform, and obtain the high-temperature resistant radar stealth coating for repair.

[0051] Because anhydrous ethanol continuously evaporates during mixing, it needs to be added in a timely manner during the homogenization process to ensure the stability of GT35, GT75, and Sm. 0.9 Sr 0.1 Al 0.5 Co 0.5 The mass ratio of O3 powder to anhydrous ethanol is maintained within the range of (1-2):(0.5-1.5):(0.5-1):(1-2).

[0052] This invention also provides an application of the above-described high-temperature resistant radar stealth coating for repair in the preparation of high-temperature resistant radar stealth coatings.

[0053] Furthermore, the process for preparing the high-temperature resistant radar stealth coating is as follows:

[0054] (a) Substrate pretreatment: The area to be repaired on the surface of the GH3128 substrate with dimensions of Φ180mm×180mm×5mm is sandblasted until the surface roughness of the area to be repaired is 10μm.

[0055] (b) Preparation of high temperature radar stealth coating: The coating prepared in this embodiment is applied to the area to be repaired after sandblasting by brushing and cured to form a high temperature radar stealth coating. The high temperature radar stealth coating is smoothly transitioned to the non-repaired area on the surface of the GH3128 substrate.

[0056] Specifically, the coating is first evenly brushed onto the area to be repaired on the GH3128 substrate after sandblasting, and the thickness is brushed to 1.35mm before curing. Then, it is left at room temperature for 15 minutes to allow the coating to reach a surface dry state. Next, the GH3128 substrate is kept at 950℃ for 30 minutes using a hot air gun, and then naturally cooled to room temperature to obtain a high-temperature radar stealth coating.

[0057] Furthermore, the surface of the high-temperature radar stealth coating was polished using sandpaper and a file. After polishing, the high-temperature radar stealth coating and the non-repaired area of ​​the GH3128 substrate surface were smoothly transitioned with a step difference of 0.4 mm, as shown in Figure 2.

[0058] To further illustrate the effectiveness of the present invention, the following experiments were conducted in this embodiment:

[0059] The prepared high-temperature radar stealth coating was subjected to a 1000℃ air-cooled thermal shock performance test. The test standard was carried out in accordance with the "Coating Thermal Shock Test Method Part 1 High Temperature Furnace Heating Method" (Q / AVIC 06016.1-2013). The test results are shown in Figure 3. The test results show that after 100 cycles of 1000℃ air-cooled thermal shock, the coating in the repaired area and the coating in the non-repaired area are both intact.

[0060] Analysis of the test results shows that the high-temperature radar stealth coating prepared in Example 1 of this invention has excellent thermal shock resistance.

[0061] Example 2

[0062] Referring to Figure 1, an embodiment of the present invention provides a high-temperature resistant radar stealth coating for repair. The coating is composed of low-melting-point glass powder A, low-melting-point glass powder B, ceramic radar absorber and diluent, with a mass ratio of 1:0.5:0.5:1.

[0063] Furthermore, the initial melting temperature of glass powder A is 450℃, the initial melting temperature of glass powder B is 800℃, and the ceramic radar absorber is Sm 0.9 Sr 0.1 Al 0.5 Co 0.5 O3 powder, the diluent is anhydrous ethanol. Specifically, glass powder A is product GT45 sold by Anmi Micro-Nano New Materials (Guangzhou) Co., Ltd., and glass powder B is product GT80 sold by Anmi Micro-Nano New Materials (Guangzhou) Co., Ltd.

[0064] This invention also provides a method for preparing the high-temperature resistant radar stealth coating for repair as described above, specifically including the following steps:

[0065] S1. Weigh GT45, GT80, and Sm according to a mass ratio of 1:0.5:0.5:1. 0.9 Sr 0.1 Al 0.5 Co 0.5 O3 powder and anhydrous ethanol;

[0066] S2. First, manually stir and mix the raw materials weighed in S1 with a spatula until there is no sediment. Then, use a homogenizer to stir at a speed of 1200r / min for 4 minutes until the mixture is uniform, and obtain the high-temperature resistant radar stealth coating for repair.

[0067] Because anhydrous ethanol continuously evaporates during mixing, it needs to be added in a timely manner during the homogenization and dispersion process to ensure the stability of GT45, GT80, and Sm. 0.9 Sr 0.1 Al 0.5 Co 0.5 The mass ratio of O3 powder to anhydrous ethanol is maintained within the range of (1-2):(0.5-1.5):(0.5-1):(1-2).

[0068] This invention also provides an application of the above-described high-temperature resistant radar stealth coating for repair in the preparation of high-temperature resistant radar stealth coatings.

[0069] Furthermore, the process for preparing the high-temperature resistant radar stealth coating is as follows:

[0070] (a) Substrate pretreatment: The area to be repaired on the surface of the GH3128 substrate with dimensions of Φ25.4mm×6mm was sandblasted until the surface roughness of the area to be repaired was 15μm.

[0071] (b) Preparation of high temperature radar stealth coating: The coating prepared in this embodiment is applied to the area to be repaired after sandblasting by brushing and cured to form a high temperature radar stealth coating. The high temperature radar stealth coating is smoothly transitioned to the non-repaired area on the surface of the GH3128 substrate.

[0072] Specifically, the coating is first evenly brushed onto the area to be repaired on the GH3128 substrate after sandblasting, and the thickness is brushed to 1.3mm before curing. Then, it is left at room temperature for 10 minutes to allow the coating to reach a surface dry state. Next, the GH3128 substrate is kept at 900℃ for 60 minutes using an electric resistance furnace, and then naturally cooled to room temperature to obtain a high-temperature radar stealth coating.

[0073] Furthermore, the surface of the high-temperature radar stealth coating was polished using sandpaper and a file. After polishing, the high-temperature radar stealth coating and the non-repaired area of ​​the GH3128 substrate surface were smoothly transitioned with a step difference of 0.2mm.

[0074] To further illustrate the effectiveness of the present invention, the following experiments were conducted in this embodiment:

[0075] The adhesion performance of the prepared high-temperature radar stealth coating was tested. The test standard was carried out in accordance with the "Adhesion Test of Paints and Varnishes by Pull-Off Method" (GB / T 5210-2006). The test results are shown in Table 1. According to the test results, the adhesion of the repair coating is basically the same as that of the original coating, both ≥8MPa.

[0076] Table 1. Comparison of the repaired high-temperature radar stealth coating with the coating in the unrepaired area.

[0077]

[0078]

[0079] Analysis of the test results shows that the high-temperature radar stealth coating prepared in Example 2 of this invention has excellent adhesion performance.

[0080] Example 3

[0081] Referring to Figure 1, an embodiment of the present invention provides a high-temperature resistant radar stealth coating for repair. The coating is composed of glass powder A, glass powder B, ceramic radar absorber and diluent, with a mass ratio of 2:1.5:1:2.

[0082] Furthermore, the initial melting temperature of glass powder A is 500℃, the initial melting temperature of glass powder B is 850℃, and the ceramic radar absorber is Sm 0.9 Sr 0.1 Al 0.5 Co 0.5 O3 powder, the diluent is anhydrous ethanol. Specifically, glass powder A is product GT50 sold by Anmi Micro-Nano New Materials (Guangzhou) Co., Ltd., and glass powder B is product GT85 sold by Anmi Micro-Nano New Materials (Guangzhou) Co., Ltd.

[0083] This invention also provides a method for preparing the high-temperature resistant radar stealth coating for repair as described above, specifically including the following steps:

[0084] S1. Weigh GT50, GT85, and Sm according to a mass ratio of 2:1.5:1:2. 0.9 Sr 0.1 Al 0.5 Co 0.5 O3 powder and anhydrous ethanol;

[0085] S2. First, manually stir and mix the raw materials weighed in S1 with a spatula until there is no sediment. Then, use a homogenizer to stir at a speed of 1500r / min for 5 minutes until the mixture is uniform, and obtain the high-temperature resistant radar stealth coating for repair.

[0086] Because anhydrous ethanol continuously evaporates during mixing, it needs to be added in a timely manner during the homogenization and dispersion process to ensure the stability of GT50, GT85, and Sm. 0.9 Sr 0.1 Al 0.5 Co 0.5 The mass ratio of O3 powder to anhydrous ethanol is maintained within the range of (1-2):(0.5-1.5):(0.5-1):(1-2).

[0087] This invention also provides an application of the above-described high-temperature resistant radar stealth coating for repair in the preparation of high-temperature resistant radar stealth coatings.

[0088] Furthermore, the process for preparing the high-temperature resistant radar stealth coating is as follows:

[0089] (a) Substrate pretreatment: The area to be repaired on the surface of the GH5188 substrate with dimensions of Φ180mm×180mm×5mm was sandblasted. The sandblasting area was a square area of ​​36mm×36mm in the center and four corners of the flat plate, as shown in Figure 4. The surface roughness of the area to be repaired after sandblasting was 5μm.

[0090] (b) Preparation of high temperature radar stealth coating: The coating prepared in this embodiment is applied to the area to be repaired after sandblasting by brushing and cured to form a high temperature radar stealth coating. The high temperature radar stealth coating is smoothly transitioned to the non-repaired area on the surface of the GH5188 substrate.

[0091] Specifically, the coating is first evenly brushed onto the area to be repaired on the GH5188 substrate after sandblasting, and the thickness is brushed to 1.4mm before curing. Then, it is left at room temperature for 30 minutes to allow the coating to reach a surface dry state. Next, the GH5188 substrate is kept at 1000℃ for 45 minutes using a quartz heat lamp, and then naturally cooled to room temperature to obtain a high-temperature radar stealth coating.

[0092] Furthermore, the surface of the high-temperature radar stealth coating was polished using an electric polishing tool. After polishing, the high-temperature radar stealth coating and the non-repaired area of ​​the GH5188 substrate surface were smoothly transitioned with a step difference of 0.2mm.

[0093] To further illustrate the effectiveness of the present invention, the following experiments were conducted in this embodiment:

[0094] The prepared high-temperature radar stealth coating was subjected to reflectivity testing at 900℃. The testing equipment was a vector network analyzer, and the testing method was the bow method. The test results are shown in Figure 5. Curve 1 is the reflection loss curve before coating damage; curve 2 is the reflection loss curve after the coating was repaired using the high-temperature radar stealth coating prepared by the coating in this embodiment.

[0095] Analysis of the test results in Figure 5 shows that the high-temperature radar stealth coating repaired in Example 3 of this invention has excellent high-temperature radar absorption performance.

[0096] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention.

[0097] It should be understood that the present invention is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A high-temperature resistant radar stealth coating for repair, characterized in that, The coating is composed of glass powder A, glass powder B, ceramic radar absorber, and diluent in a mass ratio of (1~2):(0.5~1.5):(0.5~1):(1~2); the initial melting temperature of glass powder B is higher than that of glass powder A; the initial melting temperature of glass powder A is 350℃~500℃, and the initial melting temperature of glass powder B is 700℃~850℃; the ceramic radar absorber is Sm 0.9 Sr 0.1 Al 0.5 Co 0.5 O3 powder.

2. The high-temperature resistant radar stealth coating for repair according to claim 1, characterized in that, The diluent is a volatile diluent.

3. A method for preparing a high-temperature resistant radar stealth coating for repair as described in claim 2, characterized in that, Specifically, the following steps are included: S1. Weigh glass powder A, glass powder B, ceramic radar absorber and diluent according to the mass ratio (1~2):(0.5~1.5):(0.5~1):(1~2); S2. First, manually stir and mix the glass powder A, glass powder B, ceramic radar absorber and diluent weighed in S1 with a spatula until there is no sediment. Then, stir with a disperser for a set time until the mixture is uniform to obtain the high temperature resistant radar stealth coating for repair.

4. The preparation method according to claim 3, characterized in that, In S2, a diluent is added during the stirring process of the disperser, so that the mass ratio of glass powder A, glass powder B, ceramic radar absorber and diluent is in the range of (1~2):(0.5~1.5):(0.5~1):(1~2); the speed of the disperser is set to 1000r / min~1500r / min, and the stirring time of the disperser is set to 3min~5min.

5. The application of the high-temperature resistant radar stealth coating for repair as described in claim 2 in the preparation of a high-temperature resistant radar stealth coating.

6. The application according to claim 5, characterized in that, The process of preparing the high-temperature radar stealth coating is as follows: (a) Substrate pretreatment: The area to be repaired on the surface of the substrate is sandblasted until the surface roughness of the area to be repaired reaches the set value; (b) Preparation of high-temperature radar stealth coating: The coating is applied to the area to be repaired after sandblasting by brushing and cured to form a high-temperature radar stealth coating. The high-temperature radar stealth coating is smoothly transitioned to the non-repaired area on the surface of the substrate.

7. The application according to claim 6, characterized in that, In (a), the surface roughness of the area to be repaired is 5 μm to 15 μm.

8. The application according to claim 6, characterized in that, The brushing treatment method and curing process in (b) are as follows: First, the coating is evenly brushed onto the area to be repaired after sandblasting until the thickness of the coating is greater than the thickness of the non-repaired area on the substrate surface. Then, it is placed at room temperature for 10 min to 30 min to allow the coating to reach a surface dry state. Then, the substrate is kept at 900℃ to 1000℃ for 30 min to 60 min using a heating device to obtain a high-temperature radar stealth coating.

9. The application according to claim 8, characterized in that, The surface of the high-temperature radar stealth coating is polished until it is smooth to ensure a smooth transition between the high-temperature radar stealth coating and the unrepaired area of ​​the substrate surface; wherein the step difference between the polished high-temperature radar stealth coating and the unrepaired area of ​​the substrate surface is ≤0.5mm.

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