A wave-transparent anti-ablation coating and a preparation method thereof

Abstract

The present application relates to the technical field of heat protection materials, and discloses a shape-maintaining wave-transparent ablation-resistant coating and a preparation method thereof, the shape-maintaining wave-transparent ablation-resistant coating comprises the following components in parts by weight: 100 parts of base glue, 10-30 parts of reinforcing filler, 10-30 parts of wave-transparent short-cut fiber, 20-40 parts of ablation-resistant filler, 5-20 parts of negative-expansion filler, 20-40 parts of lightweight filler, and 3-10 parts of curing agent; the wave-transparent short-cut fiber is at least two of short-cut glass fiber, short-cut high-silica fiber, short-cut quartz fiber, short-cut alumina fiber, short-cut silicon carbide fiber, short-cut polyimide fiber, short-cut phenolic fiber, and short-cut basalt fiber; and the ablation-resistant filler is at least two of spherical silicon carbide, boron carbide, boron nitride, zirconium carbide, zirconium boride, boron oxide, aramid fiber powder, aramid pulp, polyimide powder, phenolic resin powder, and silicon resin microspheres. The shape-maintaining wave-transparent ablation-resistant coating has good shape-maintaining property, wave-transmitting property and ablation resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat-resistant materials, in particular to a shape-maintaining wave-transparent ablation-resistant coating and a preparation method thereof. BACKGROUND

[0002] When a missile enters the atmosphere, due to aerodynamic heating, the air is subjected to strong compression and friction, and most of the kinetic energy is converted into heat energy, and the heat energy is rapidly transferred to the surface of the missile, that is, the aerodynamic heating effect occurs. When the missile flies faster, the aerodynamic heating effect is more significant. As core components of the missile, fairings, radomes and the like are also affected by aerodynamic heating, and are required to have not only good ablation resistance and shape-maintaining properties but also good wave-transmitting properties.

[0003] The pyrolysis gas generated inside the coating of the existing heat-resistant material cannot be promptly guided at high temperatures, and phenomena such as cracking and bulging of the coating may occur, and the shape-maintaining property of the coating is poor. Moreover, the existing heat-resistant material cannot achieve ablation resistance, shape-maintaining and wave-transmitting properties, and cannot meet the ablation resistance and wave-transmitting requirements of special parts such as fairings and radomes.

[0004] Therefore, there is an urgent need for a shape-maintaining wave-transparent ablation-resistant coating and a preparation method thereof to solve the above technical problems. SUMMARY

[0005] Based on the above, the purpose of the present application is to provide a shape-maintaining wave-transparent ablation-resistant coating and a preparation method thereof, which have good shape-maintaining property, wave-transmitting property and ablation resistance.

[0006] To achieve the above purpose, the present application adopts the following technical solutions:

[0007] A shape-maintaining wave-transparent ablation-resistant coating comprises the following components by weight fraction:

[0008] 100 parts of base glue, 10-30 parts of reinforcing filler, 10-30 parts of chopped fiber, 20-40 parts of ablation-resistant filler, 5-20 parts of negative expansion filler, 20-40 parts of lightweight filler, and 3-10 parts of curing agent;

[0009] The chopped fiber is one or more of chopped glass fiber, chopped high-silica fiber, chopped quartz fiber, chopped alumina fiber, chopped silicon carbide fiber, chopped polyimide fiber, chopped phenolic fiber and chopped basalt fiber.

[0010] The ablation-resistant filler is one or more of spherical silicon carbide, boron carbide, boron nitride, zirconium carbide, zirconium boride, boron oxide, aramid powder, aramid pulp, polyimide powder, phenolic resin powder and silicone microspheres.

[0011] As a preferred scheme of the shape-maintaining wave-transparent ablation-resistant coating, the length of the wave-transparent chopped fiber is 0.5-3 mm.

[0012] As a preferred scheme of the shape-maintaining, wave-transparent and ablation-resistant coating, the particle size of the ablation-resistant filler is 5-40 μm.

[0013] As a preferred scheme of the shape-maintaining, wave-transparent and ablation-resistant coating, the base glue comprises liquid silicone rubber and liquid silicone resin, the silicone rubber is one or more of methyl vinyl silicone rubber, methyl vinyl phenyl silicone rubber, methyl vinyl silicone boron rubber; the silicone resin is one or more of methyl vinyl silicone resin, methyl vinyl phenyl silicone resin, methyl vinyl silicone boron resin.

[0014] As a preferred scheme of the shape-maintaining, wave-transparent and ablation-resistant coating, the negative expansion filler is one or more of cordierite, β-eucryptite, ZrW2O8, ZrV2O7, HfW2O8, Y2W3O 12

[0015] As a preferred scheme of the shape-maintaining, wave-transparent and ablation-resistant coating, the particle size of the negative expansion filler is 5-40 μm.

[0016] As a preferred scheme of the shape-maintaining, wave-transparent and ablation-resistant coating, the light filler is one or more of hollow glass microbeads, hollow ceramic microbeads, hollow phenolic microspheres, cork powder, aerogel powder.

[0017] As a preferred scheme of the shape-maintaining, wave-transparent and ablation-resistant coating, the curing agent comprises an inhibitor, a crosslinking agent and a catalyst;

[0018] The inhibitor is one or more of 1-ethynylcyclohexanol, tetramethyltetavinylcyclotetrasiloxane, 3-methyl-1-butyne-3-ol, 3-phenyl-1-butyne-3-ol;

[0019] The crosslinking agent is one or more of methyl hydrogen-containing silicone oil, phenyl hydrogen-containing silicone oil, methyl hydrogen-containing silicone resin, phenyl hydrogen-containing silicone resin;

[0020] The catalyst is one or more of platinum-vinyl alkoxy silane complex, platinum-alkyne-based complex.

[0021] As a preferred scheme of the shape-maintaining, wave-transparent and ablation-resistant coating, the reinforcing filler is one or more of fumed white carbon black, precipitated white carbon black, carbon black.

[0022] A preparation method of a shape-maintaining, wave-transparent and ablation-resistant coating, for preparing the shape-maintaining, wave-transparent and ablation-resistant coating of any of the above technical schemes, the preparation method comprising the following steps:

[0023] The base glue, reinforcing filler, negative thermal expansion filler, chopped fiber and ablation-resistant filler are weighed according to the predetermined mass, stirred and dispersed in a barrel, and then added to an open mill for uniform mixing to obtain a mixture;​

[0024] adding light filler, curing agent and diluent in the mixture, stirring uniformly, preparing coating layer with preset size through brushing, squeegeeing or spraying process;

[0025] after curing the coating layer at preset temperature for preset time, obtaining the wave-transparent and ablation-resistant coating layer.

[0026] The present application has the following advantages:

[0027] The present application provides a wave-transparent and ablation-resistant coating layer, which can increase the wave-transparent performance and improve the ablation resistance by using wave-transparent short-cut fibers, and the accumulation gap is formed between the wave-transparent short-cut fibers and the ablation-resistant filler, the accumulation gap is filled with air, and the low dielectric constant and low dielectric loss of air can further improve the wave-transparent performance of the coating layer; by using negative expansion filler, the thermal expansion coefficient of the coating layer can be adjusted, so that the linear expansion coefficient of the coating layer is equivalent to that of the substrate, which is beneficial to solve the problems of blistering, cracking and poor shape retention of the coating layer at high temperature; by adding light filler and accumulation pores formed by different shapes and particle sizes of various fillers, a porous structure is formed inside the coating layer to release internal stress and energy, avoid cracking of the coating layer, and the exhaust channel generated by the accumulation gap is beneficial to the drainage of pyrolysis gas generated inside the coating layer at high temperature, preventing the coating layer from bulging and improving the shape retention performance.

[0028] The present application also provides a preparation method of a wave-transparent and ablation-resistant coating layer, and the wave-transparent and ablation-resistant coating layer prepared by the preparation method has good shape retention, wave-transparent performance and ablation resistance. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the contents of the embodiments of the present application and the drawings.

[0030] Figure 1 is a flow chart of the preparation method of the wave-transparent and ablation-resistant coating layer of the embodiments of the present application;

[0031] Figure 2 is a schematic diagram of the wave-transparent and ablation-resistant coating layer provided by the embodiment 1 of the present application after wind tunnel test;

[0032] Figure 3 is a schematic diagram of the wave-transparent and ablation-resistant coating layer provided by the comparative example 1 of the present application after wind tunnel test;

[0033] Figure 4is a schematic diagram of the wave-transparent anti-ablation coating provided by the present application Comparative Example 2 after a wind tunnel test;

[0034] Figure 5 is a schematic diagram of the wave-transparent anti-ablation coating provided by the present application Comparative Example 3 after a wind tunnel test;

[0035] Figure 6 is a schematic diagram of the wave-transparent anti-ablation coating provided by the present application Comparative Example 4 after a wind tunnel test. DETAILED DESCRIPTION

[0036] The application will be further described below in conjunction with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the application, and not to limit the application. In addition, it should be noted that, for the sake of description, only the parts related to the application are shown in the drawings, not all the structures.

[0037] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0038] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0039] In the description of the present embodiment, the terms "up", "down", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0040] The embodiment provides a shape-maintaining wave-transparent ablation-resistant coating, which comprises the following components in parts by weight: 100 parts of base glue, 10-30 parts of reinforcing filler, 10-30 parts of wave-transparent short-cut fiber, 20-40 parts of ablation-resistant filler, 5-20 parts of negative expansion filler, 20-40 parts of light filler, and 3-10 parts of curing agent. By adopting the wave-transparent short-cut fiber, the wave-transparent property and the ablation-resistant property of the coating can be improved, and the accumulation gap is formed between the wave-transparent short-cut fiber and the ablation-resistant filler, the accumulation gap is filled with air, and the wave-transparent property of the coating can be further improved by using the low dielectric constant and low dielectric loss of the air; by adopting the negative expansion filler, the thermal expansion coefficient of the coating can be adjusted, so that the linear expansion coefficient of the coating is equivalent to that of the base material, and the problems of bubbling, cracking and poor shape-maintaining property of the coating at high temperature can be solved; and by adding the light filler and the accumulation pores formed by the different shapes and particle sizes of the various fillers, a porous structure can be formed in the coating to release internal stress and energy, avoid cracking of the coating, and the exhaust channel generated by the accumulation gap is beneficial to the dredging of the pyrolysis gas generated in the coating at high temperature, prevents the coating from bulging, and improves the shape-maintaining property.

[0041] Specifically, the wave-transparent short-cut fiber is at least one of short-cut glass fiber, short-cut high-silica fiber, short-cut quartz fiber, short-cut aluminum oxide fiber, short-cut silicon carbide fiber, short-cut polyimide fiber, short-cut phenolic fiber and short-cut basalt fiber. At least two wave-transparent short-cut fibers are used as fillers, the fibers with different lengths form accumulation pores in the coating, which is beneficial to the release of internal stress and the energy generated by the internal stress, and the dredging of the pyrolysis gas generated in the coating at high temperature, and the coating is free of bubbling, cracking and adhesion failure with the base material.

[0042] More specifically, the ablation-resistant filler is at least two of spherical silicon carbide, boron carbide, boron nitride, zirconium carbide, zirconium boride, boron oxide, aramid powder, aramid pulp, polyimide powder, phenolic resin powder and silicone microsphere. The ablation-resistant fillers with different particle sizes form accumulation pores in the coating, which is beneficial to the release of internal stress and the energy generated by the internal stress, and the dredging of the pyrolysis gas generated in the coating at high temperature, and the coating is free of bubbling, cracking and adhesion failure with the base material.

[0043] Preferably, the length of the wave-transparent short-cut fiber is 0.5-3 mm, for example, the length of the wave-transparent short-cut fiber is 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm, etc., which is set according to actual needs; the particle size of the ablation-resistant filler is 5-40 μm, for example, the particle size of the ablation-resistant filler is 5 μm, 10 μm, 20 μm, 30 μm or 40 μm, etc., which is set according to actual needs. By adjusting the length of the wave-transparent short-cut fiber and the particle size of the ablation-resistant filler, the accumulation gap is formed between the wave-transparent short-cut fiber and the ablation-resistant filler, which is beneficial to release the energy generated by internal stress and avoid the cracking of the coating; at the same time, the exhaust channel generated by the accumulation gap is beneficial to guide the pyrolysis gas generated in the coating at high temperature, prevent the coating from bulging, and make the coating have good shape maintaining performance.

[0044] In the embodiment, the base glue includes liquid silicone rubber and liquid silicone resin, the silicone rubber is one or more of methyl vinyl silicone rubber, methyl vinyl phenyl silicone rubber and methyl vinyl silicone boron rubber; the silicone resin is one or more of methyl vinyl silicone resin, methyl vinyl phenyl silicone resin and methyl vinyl silicone boron resin. By compounding the silicone rubber and the silicone resin, an interpenetrating network structure is formed, the linear structure of the silicone rubber gives the coating flexibility, the bulk structure of the silicone resin gives the coating ablation-resistant performance, and the two form a synergistic effect, so that the coating has both ablation-resistant performance and better flexibility.

[0045] In the embodiment, the reinforcing filler is one or more of fumed white carbon black, precipitated white carbon black and carbon black.

[0046] In the embodiment, the negative expansion filler is one or more of coesite, β-eucryptite, ZrW2O8, ZrV2O7, HfW2O8, Y2W3O 12 The use of the negative expansion filler can adjust the thermal expansion coefficient of the coating, so that the linear expansion coefficient of the coating is comparable to that of the base material, thereby avoiding the bubbling and cracking of the coating at high temperature and improving the shape maintaining performance of the coating.

[0047] Preferably, the particle size of the negative expansion filler is 5-40 μm, for example, the particle size of the negative expansion filler is 5 μm, 10 μm, 20 μm, 30 μm or 40 μm, etc., which is set according to actual needs. The use of the negative expansion filler with reasonable particle size is beneficial to form accumulation gaps between the fillers, improve the shape maintaining performance of the coating, and ensure the effect of the negative expansion filler on adjusting the thermal expansion coefficient of the coating.

[0048] In the embodiment, the lightweight filler is one or more of hollow glass microbeads, hollow ceramic microbeads, hollow phenolic microspheres, cork powder and aerogel powder. By adding the lightweight filler, a micro-nano pore structure is formed in the coating, the micro-nano pores are filled with air, and the low dielectric constant and low dielectric loss of air can further improve the wave-transparent performance of the coating.

[0049] Preferably, the density of the lightweight filler is 0.1-0.5 g / cm 3 , for example, the sealing of the lightweight filler is 0.1 g / cm 3 , 0.2 g / cm 3 , 0.3 g / cm 3 , 0.4 g / cm 3 , 0.5 g / cm 3 , etc., which is specifically set according to actual needs.

[0050] Further, the curing agent includes an inhibitor, a crosslinking agent, and a catalyst, the inhibitor is one or more of 1-ethynylcyclohexanol, tetramethyltetavinylcyclotetrasiloxane, 3-methyl-1-butyne-3-ol, and 3-phenyl-1-butyne-3-ol, the crosslinking agent is one or more of methyl hydrogen-containing silicone oil, phenyl hydrogen-containing silicone oil, methyl hydrogen-containing silicone resin, and phenyl hydrogen-containing silicone resin, and the catalyst is one or more of platinum-vinyl alkoxysilane complex and platinum-alkyne-based complex. Among them, the hydrogen mass fraction in the crosslinking agent is preferably 0.3%-0.6%, for example, the hydrogen mass fraction in the crosslinking agent is 0.3%, 0.4%, 0.5%, or 0.6%, etc., which is specifically set according to actual needs.

[0051] As shown in Figure 1 , the embodiment also provides a preparation method of the shape-preserving wave-transparent ablation-resistant coating, and the preparation method of the shape-preserving wave-transparent ablation-resistant coating comprises the following steps:

[0052] S100: A base glue, a reinforcing filler, a negative thermal expansion filler, a wave-transparent short-cut fiber, and an ablation-resistant filler are weighed according to a preset mass, are placed in a barrel for stirring and dispersing, and are then added to an open mill for uniform mixing to obtain a mixed material;

[0053] Among them, the selection of the base glue, the reinforcing filler, the negative thermal expansion filler, the wave-transparent short-cut fiber, and the ablation-resistant filler refers to the selection of the base glue, the reinforcing filler, the negative thermal expansion filler, the wave-transparent short-cut fiber, and the ablation-resistant filler in the shape-preserving wave-transparent ablation-resistant coating, which will not be repeated here.

[0054] S200: A lightweight filler, a curing agent, and a diluent are added to the mixed material, and are stirred uniformly, and then a coating of a preset size is prepared through a brushing, a squeegeeing, or a spraying process;

[0055] Among them, the selection of the lightweight filler and the curing agent refers to the selection of the lightweight filler and the curing agent in the shape-preserving wave-transparent ablation-resistant coating, which will not be repeated here.

[0056] Among them, the diluent is ethyl acetate or No. 120 solvent oil.

[0057] S300: After the coating is cured at a preset temperature for a preset time, a shape-preserving wave-transparent ablation-resistant coating is obtained.

[0058] Optionally, the coating is cured at room temperature for 3-5 days, or the coating is cured at 80°C for 12h.

[0059] The wave-transparent ablation-resistant coating prepared by the method has good wave-transparency and ablation resistance, and also has good shape retention.

[0060] The application will be further described below in combination with specific examples and comparative examples, but the application is not limited to the following examples.

[0061] Example 1

[0062] The wave-transparent ablation-resistant coating is prepared by the preparation method of the wave-transparent ablation-resistant coating, and the wave-transparent ablation-resistant coating comprises 100 parts of base glue, 20 parts of reinforcing filler, 15 parts of wave-transparent chopped fiber, 10 parts of negative thermal expansion filler, 30 parts of ablation-resistant filler, 20 parts of lightweight filler, and 5 parts of curing agent. The base glue is a compound of 80 parts of methyl vinyl phenyl silicone rubber and 20 parts of methyl vinyl phenyl silicone resin, the reinforcing filler is fumed white carbon black, the wave-transparent chopped fiber is a compound of 10 parts of chopped quartz fiber and 5 parts of chopped polyimide fiber, the length of the chopped quartz fiber is preferably 1 mm, the length of the chopped polyimide fiber is 0.5 mm, the ablation-resistant filler is a compound of 5 parts of boron carbide, 15 parts of zirconium boride, and 10 parts of polyimide powder, the particle size of the boron carbide and the zirconium boride is 10 μm, the particle size of the polyimide powder is 40 μm, the negative thermal expansion filler is β-lithium feldspar, the lightweight filler is a compound of 15 parts of hollow glass microbeads and 5 parts of aerogel powder, the density of the hollow glass microbeads is 0.25 g / cm3, the density of the aerogel powder is 0.1 g / cm3, the inhibitor is 1-ethynylcyclohexanol, the crosslinking agent is phenyl hydrogen-containing silicone oil with a hydrogen mass fraction of 0.35%, and the catalyst is platinum-vinyl alkoxysilane complex.

[0063] Comparative Example 1

[0064] The wave-transparent ablation-resistant coating is prepared by the preparation method of the wave-transparent ablation-resistant coating, and the wave-transparent ablation-resistant coating comprises 100 parts of base glue, 20 parts of reinforcing filler, 15 parts of wave-transparent chopped fiber, 30 parts of ablation-resistant filler, 10 parts of negative thermal expansion filler, 20 parts of lightweight filler, and 5 parts of curing agent.

[0065] The difference between the example 1 and the comparative example 1 is that the wave-transparent chopped fiber is 15 parts of chopped quartz fiber with a length of 1 mm, and the ablation-resistant filler is 30 parts of boron carbide with a particle size of 10 μm.

[0066] Comparative Example 2

[0067] The preparation method of the wave-shaped wave-transparent anti-ablation coating is used to prepare the wave-shaped wave-transparent anti-ablation coating, and the wave-shaped wave-transparent anti-ablation coating comprises 100 parts of base glue, 20 parts of reinforcing filler, 15 parts of wave-transparent short-cut fiber, 30 parts of anti-ablation filler, 10 parts of negative expansion filler, 20 parts of lightweight filler and 5 parts of curing agent.

[0068] Different from example 1, no wave-transparent short-cut fiber is added.

[0069] Comparative example 3

[0070] The preparation method of the wave-shaped wave-transparent anti-ablation coating is used to prepare the wave-shaped wave-transparent anti-ablation coating, and the wave-shaped wave-transparent anti-ablation coating comprises 100 parts of base glue, 20 parts of reinforcing filler, 15 parts of wave-transparent short-cut fiber, 30 parts of anti-ablation filler, 10 parts of negative expansion filler, 20 parts of lightweight filler and 5 parts of curing agent.

[0071] Different from example 1, the anti-ablation filler is boron carbide, iron oxide and polyimide powder, wherein the weight fraction of boron carbide is 5 parts, the weight fraction of iron oxide is 15 parts, and the weight fraction of polyimide powder is 10 parts, the particle size of boron carbide and iron oxide is 10 μm, and the particle size of polyimide powder is 40 μm.

[0072] Comparative example 4

[0073] The preparation method of the wave-shaped wave-transparent anti-ablation coating is used to prepare the wave-shaped wave-transparent anti-ablation coating, and the wave-shaped wave-transparent anti-ablation coating comprises 100 parts of base glue, 20 parts of reinforcing filler, 15 parts of wave-transparent short-cut fiber, 30 parts of anti-ablation filler, 10 parts of negative expansion filler, 20 parts of lightweight filler and 5 parts of curing agent.

[0074] Different from example 1, no wave-transparent short-cut fiber is added, the anti-ablation filler is 15 parts of quartz fiber powder, 5 parts of boron carbide, 15 parts of zirconium boride and 10 parts of polyimide powder, the particle size of boron carbide and zirconium boride is 10 μm, and the particle size of polyimide powder is 40 μm.

[0075] The wave-shaped wave-transparent anti-ablation coatings prepared in the above example 1 and comparative examples 1-4 are tested for performance, including density, tensile strength, wave-transparent rate, anti-ablation performance and wave shape, wherein the density test method refers to GB / T 533, the tensile strength test method refers to GB / T 528, the wave-transparent rate test method refers to GJB 7954, the anti-ablation performance refers to GJB 7050, and the wave shape is detected by visual inspection, and the detection results refer to Figures 2 to 6 and as follows:

[0076]

[0077]

[0078] From the test results, it can be seen that, when the wave-transparent short-cut fibers are absent, other fibers are used, or single-component short-cut fibers and ablation-resistant fillers are used, it is difficult to form accumulated pores in the coating, which is not conducive to releasing the energy generated by internal stress, cannot dredge pyrolysis gas generated in the coating at high temperature, the coating is blistering, cracking, and debonding from the substrate, and the ablation resistance and shape retention performance are not good. Moreover, when iron oxide is used as the ablation-resistant filler, although the ablation resistance is good, due to the poor wave-transparent performance of the carbon fibers and iron oxide, the coating has a wave-transparent rate of only 72%, and it is difficult to achieve both wave-transparent performance and ablation resistance.

[0079] It should be noted that the above only describes the preferred embodiments of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A conformal, transparent, ablative-resistant coating, characterized in that: The adhesive composition comprises 100 parts of base adhesive, 20 parts of reinforcing filler, 15 parts of wave-transparent short fiber, 10 parts of negative expansion filler, 30 parts of ablation-resistant filler, 20 parts of light filler and 5 parts of curing agent; The base adhesive is a blend of 80 parts methyl vinyl phenyl silicone rubber and 20 parts methyl vinyl phenyl silicone resin; the reinforcing filler is fumed silica; the wave-transparent chopped fiber is a blend of 10 parts chopped quartz fiber and 5 parts chopped polyimide fiber, with the chopped quartz fiber having a length of 1 mm and the chopped polyimide fiber having a length of 0.5 mm; the ablation-resistant filler is a blend of 5 parts boron carbide, 15 parts zirconium boride, and 10 parts polyimide powder, with the boron carbide and zirconium boride having a particle size of 10 µm and the polyimide powder having a particle size of 40 µm; the negative expansion filler is β-lithium nepheline; and the lightweight filler is a blend of 15 parts hollow glass microspheres and 5 parts aerogel powder, with the hollow glass microspheres having a density of 0.25 g / cm³. 3 The density of the aerogel powder is 0.1 g / cm³. 3 The curing agent includes an inhibitor, a crosslinking agent, and a catalyst. The inhibitor is 1-ethynylcyclohexanol, the crosslinking agent is phenyl hydrogen-containing silicone oil with a hydrogen mass fraction of 0.35%, and the catalyst is a platinum-vinylalkoxysilane complex.

Images