Preparation and application method of air-spraying anticorrosive coating capable of resisting high temperature of 1000 DEG C
The high-temperature resistant coating of 1000℃ prepared by a two-component coating system and air spraying method solves the corrosion problem of metal parts at high temperatures, provides excellent adhesion and ease of construction, and is suitable for aerospace and weaponry fields.
Patent Information
- Application Number
- CN202511945859.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-22
- Publication Date
- 2026-02-27
AI Technical Summary
Existing technologies are insufficient to effectively protect metal components from corrosion at temperatures up to 1000°C, especially in salt spray and humid environments. Furthermore, traditional coating preparation processes are complex and make air spraying difficult to implement.
A two-component coating system is adopted, including component A, a mixture of silicone resin and pigments and fillers, and component B, a polysilazane curing agent. The coating is formed on the metal substrate by air spraying and is resistant to high temperature of 1000℃. The coating is composed of kaolin, potassium feldspar powder, etc. After curing, it is treated at high temperature to improve adhesion and corrosion resistance.
It achieves effective corrosion protection for metal parts at high temperatures of 1000℃, with excellent coating adhesion, simple construction, and is suitable for metal parts with surface roughness requirements. It is applicable to aerospace, weaponry and other fields.
Smart Images
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Figure SMS_1 
Figure SMS_2
Abstract
Description
Technical Field
[0001] This invention relates to the preparation and application method of a high-temperature resistant coating that can be air-sprayed and is resistant to temperatures up to 1000°C. It belongs to the field of high-temperature anti-corrosion coatings. Background Technology
[0002] With the development of science and technology, the operating temperature of metallic materials is constantly increasing, especially in the aerospace field. Some components not only need to withstand the oxidation and corrosion caused by high temperatures, but also the coupled corrosion from salt spray, damp heat, and other factors. To protect metallic materials from corrosion at high temperatures, high-temperature resistant coatings need to be prepared on their surfaces. Generally, silicone-based high-temperature resistant coatings can withstand temperatures of 200-500℃, while inorganic coatings such as phosphates and silicates can withstand temperatures of 600-800℃. When the temperature reaches 1000℃, thermal barrier coatings are generally prepared on the surface of metallic materials. The preparation methods for thermal barrier coatings mainly include high-velocity flame spraying (HVOF), high-frequency pulsed explosion spraying (HFPD), plasma spraying (PS), and electron beam physical vapor deposition (EB-PVD). Among these, plasma spraying and electron beam physical vapor deposition are the most widely used. In recent years, based on existing technologies, new preparation processes such as plasma-activated electron beam physical vapor deposition, suspended plasma spraying, and plasma spraying-physical vapor deposition (PS-PVD) have been developed. However, these preparation processes for thermal barrier coatings all have high technical requirements.
[0003] Developing a convenient high-temperature corrosion-resistant coating that can withstand temperatures up to 1000℃ is essential. The high-temperature corrosion-resistant coating prepared in this invention exhibits excellent adhesion, can withstand temperatures up to 1000℃, and shows no blistering or peeling after 500 hours of neutral salt spray testing. It possesses a surface roughness equivalent to that of precision turning or milling, and can be applied to metal substrates via air spraying. The coating film exhibits good adhesion and effectively protects metal components requiring a smooth surface from high-temperature corrosion. Summary of the Invention
[0004] In view of this, the purpose of this invention is to provide a method for preparing and applying a high-temperature resistant coating that can be air-sprayed at 1000℃. The high-temperature resistant coating provided by this invention possesses excellent high-temperature resistance, good adhesion, and a convenient application method. It can provide effective high-temperature corrosion protection for metal parts requiring surface roughness in high-temperature environments.
[0005] To achieve the objectives of the invention described above, the present invention provides the following technical solution: The air-spray coating resistant to 1000℃ prepared by this invention is a two-component coating, including component A, a resin slurry containing pigments and fillers, and component B, a curing agent.
[0006] The mass fractions of each component in component A and their preparation methods are as follows: Film-forming resin 20-40% Packing material 1 20-40% Pigment 5-10% Filler 2 5-20% Solvent 20-40% Anti-settling agent 1-5% Dispersant 0.5-5% Leveling agent 0.5-3% The film-forming resin is a high-temperature resistant organosilicon resin, including but not limited to one or more of the following: Longsheng Sihai Chemical SH9660 resin, SH9670 resin, SH9602 resin, SH5201 resin, SH5204 resin, SILIKOPHEN® AC1000 resin, and Dow 2403 resin. The filler 1 is one or more of the following: kaolin, potassium feldspar powder, cordierite powder, glass powder, nano silica, nano titanium dioxide, boron nitride, silicon carbide, borax, YSZ, and ZrSi2. The pigment is one or more of the following: chrome green, copper chrome black, vanadium pentoxide, manganese iron black, strontium yellow phosphate, and titanium dioxide; The filler 2 is one or more of titanium powder, chromium powder, nickel powder, and silicon powder; the particle size is 0.2μm~30μm. Its function is to enhance oxidation resistance and thermal shock resistance.
[0007] The solvent is one or more of xylene, cyclohexanone, n-butanol, butyl acetate, and ethyl acetate.
[0008] The anti-settling agent is one or more of the following: organic bentonite 908, bentonite C61, fumed silica, and polyvinylidene fluoride.
[0009] The dispersant is one or more of BYK-104s, BYK-161, BYK163, and BYK180.
[0010] The leveling agent is one or more of BYK-356, BYK-333, BYK-306, and BYK-358N.
[0011] The B component is a curing agent, which is one or more of the following: polysilazane 108, polysilazane 118, polysilazane 115, polysilazane SPN1, polysilazane SPN2, polysilazane ZGA02, polysilazane ZGA01, polysilazane ZGCO1, polysilazane TC-P11, and polysilazane TC-PO3; propyltrieth peroxide; and the same solvent as the A component.
[0012] The preparation method of component A of the coating is as follows: Component A, excluding filler 2, is added to a rapid disperser and dispersed for 4 hours. The rapidly dispersed component is then mixed with filler 2 and dispersed again in a high-speed disperser for two hours. After filtration through an 80-mesh filter, component A is obtained.
[0013] The preparation method of component B of the coating is as follows: The polysilazane mixed solvent was prepared into a solution with a solid content of 30% and 0.3 wt% polysilazane added to dicumyl peroxide (DCP). The solution was dispersed at high speed at 750 r / min for 2 h to obtain component B.
[0014] The preparation method of the coating is as follows: The components A and B are prepared in a ratio of A:B = 10:1 to 3, and after high-speed dispersion, a high-temperature coating resistant to 1000℃ is obtained.
[0015] The coating is applied and cured as follows: The coating is sprayed onto the substrate using air spraying. After surface drying, it is cured in a 150℃ oven for 2 hours, then transferred to a 350℃ muffle furnace for another 2 hours. Finally, it is heat-treated at 1000℃ for 15 minutes to obtain a coating resistant to 1000℃ high temperatures. Attached Figure Description
[0016] Figure 1 The coating appearance of S-3 after 1000℃×500h. Detailed Implementation Example 1
[0017] Preparation of Component A of a 1000℃ High-Temperature Resistant Coating: Weigh 30g of SH5210 resin, 5g of kaolin, 5g of potassium feldspar powder, 10g of YSZ, 5g of titanium dioxide, 3g of borax, 4g of nano titanium dioxide, 4g of chrome green, 22.5g of xylene, bentonite C61, dispersant BYK-104s, and leveling agent BYK-358N and add them to a fast-dispersing bottle, disperse for 4 hours. After discharging, add 8g of titanium powder and disperse on a high-speed disperser at 1000r / min for 2 hours. Filter through an 80-mesh filter to obtain Component A-1. Example 2
[0018] Preparation of Component A of a 1000℃ High-Temperature Resistant Coating: Weigh 20g of SH9602 resin, 5g of kaolin, 5g of potassium feldspar powder, 10g of YSZ, 5g of titanium dioxide, 3g of borax, 4g of nano titanium dioxide, 4g of chrome green, 22.5g of xylene, bentonite C61, dispersant BYK-104s, and leveling agent BYK-358N and add them to a fast-dispersing bottle, disperse for 4 hours. After discharging, add 8g of titanium powder and disperse on a high-speed disperser at 1000r / min for 2 hours. Filter through an 80-mesh filter to obtain Component A-2. Example 3
[0019] Preparation of Component A of a 1000℃ High-Temperature Resistant Coating: Weigh 20g of AC1000 resin, 6g of kaolin, 5g of potassium feldspar powder, 10g of YSZ, 5g of titanium dioxide, 3g of borax, 4g of nano titanium dioxide, 4g of chrome green, 22.5g of xylene, bentonite C61, dispersant BYK-104s, and leveling agent BYK-358N and add them to a fast-dispersing bottle, disperse for 4 hours. After discharging, add 8g of nickel powder and disperse for 2 hours on a high-speed disperser at 1000 r / min. Filter through an 80-mesh filter to obtain Component A-3. Example 4
[0020] Preparation of component B of the 1000℃ high-temperature resistant coating: Weigh 10g of polysilazane ZGA01, 23g of xylene, and 0.3g of dicumyl peroxide, and disperse at high speed of 750r / min for 2h to obtain component B-1. Example 5
[0021] Preparation of component B of the 1000℃ high-temperature resistant coating: Weigh 10g of polysilazane SPN1, 23g of cyclohexanone, and 0.3g of dicumyl peroxide, and disperse at high speed of 750r / min for 2h to obtain component B-2. Example 6
[0022] Preparation of component B of the 1000℃ high-temperature resistant coating: Weigh 10g of polysilazane 108, 23g of xylene, and 0.3g of dicumyl peroxide, and disperse at high speed of 750r / min for 2h to obtain component B-3. Example 7
[0023] Preparation of a 1000℃ high-temperature resistant coating: Mix 100g of component A-1 and 10g of component B-1 and disperse at high speed for 15min to obtain a 1000℃ high-temperature resistant coating. Control the air spraying pressure at 0.3-0.6MPa and use a high-atomization air cap spray gun with an orifice diameter of 0.8-1.3 for spraying, controlling the film thickness at 10-20μm. After surface drying, cure at 150℃ for 2h, then at 350℃ for 2h, and finally heat-treat in a 1000℃ high-temperature oven for 15min to obtain the 1000℃ high-temperature resistant coating S-1. Example 8
[0024] Preparation of a 1000℃ high-temperature resistant coating: Mix 100g of component A-2 and 25g of component B-21 at high speed and disperse for 15min to obtain a 1000℃ high-temperature resistant coating. Control the air spraying pressure at 0.3-0.6MPa and use a high-atomization air cap spray gun with an orifice diameter of 0.8-1.3 for spraying, controlling the film thickness at 10-20μm. After surface drying, cure at 150℃ for 2h, then at 350℃ for 2h, and finally heat-treat in a 1000℃ high-temperature oven for 15min to obtain the 1000℃ high-temperature resistant coating S-2. Example 9
[0025] Preparation of a 1000℃ high-temperature resistant coating: Mix 100g of component A-3 with 30g of component B-3 and disperse at high speed for 15min to obtain a 1000℃ high-temperature resistant coating. Control the air spraying pressure at 0.3-0.6MPa and use a high-atomization air cap spray gun with an orifice diameter of 0.8-1.3 for spraying, controlling the film thickness at 10-20μm. After surface drying, cure at 150℃ for 2h, then at 350℃ for 2h, and finally heat-treat in a 1000℃ high-temperature oven for 15min to obtain the 1000℃ high-temperature resistant coating S-3.
[0026] The coatings prepared in the above embodiments were subjected to performance testing, and the results are shown in the table below: Table 1. Results of coating performance tests in Examples 7-9
[0027] *The neutral salt spray test was conducted for only 500 hours. The sample surface remained intact, without spots or rust. The test did not proceed to the point where the sample rusted.
[0028] As can be seen from the above embodiments, the coating provided by the present invention has convenient application, high temperature resistance up to 1000℃, and other excellent properties. It can provide protection for metal parts under high temperatures and can be applied in aerospace, weaponry, and other fields.
[0029] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
[0030] Variation Example 1 Preparation of Component A of a 1000℃ High-Temperature Resistant Coating: Weigh 10g of SH5210 resin, 20g of Dow 2403 resin, 5g of potassium feldspar powder, 10g of YSZ, 5g of titanium dioxide, 4g of nano titanium dioxide, 4g of chrome green, 12.5g of xylene, 10g of cyclohexanone, bentonite C61, dispersant BYK-104s, and leveling agent BYK-358N, and add them to a dispersion bottle and disperse for 4 hours. Filter through an 80-mesh filter to obtain Component A, C-1.
[0031] Variation Example 2 Preparation of component B of the 1000℃ high-temperature resistant coating: Weigh 10g of polysilazane 118, 13g of xylene, 10g of n-butanol and 0.3g of dicumyl peroxide, disperse at high speed of 1000r / min for 1h to obtain component B D-1.
[0032] Variation Example 3 Preparation of a 1000℃ high-temperature resistant coating: Mix 100g of component C-1 and 25g of component D-1 at high speed and disperse for 15min to obtain a 1000℃ high-temperature resistant coating. Control the air spraying pressure at 0.3-0.6MPa and perform air spraying, controlling the film thickness at 10-20μm. Control the humidity at 90% and perform moisture curing for 48h, then cure at 250℃ for 4h, and finally heat treat in a 1000℃ high-temperature oven for 15min to obtain a 1000℃ high-temperature resistant coating E-1.
[0033] Table 2: Coating performance test results for variations
[0034] The innovation of this invention lies in preparing the high-temperature resistant coating component A using organosilicon resin and preferred pigments and fillers, and using treated polysilazane as a curing agent to develop a high-temperature coating resistant to 1000℃ that can be air-sprayed. It possesses advantages such as excellent high-temperature resistance, convenient application, good adhesion, and low surface roughness. Compared to conventional high-temperature resistant coatings, it exhibits better high-temperature corrosion resistance and can provide protection for metal parts with higher surface roughness requirements. Compared to other 1000℃ high-temperature resistant coatings, it has advantages such as convenient application and simple preparation, facilitating the widespread use of this coating.
[0035] The coating prepared by this invention can withstand temperatures up to 1000℃, has excellent protective properties, and also features high surface smoothness and easy cleaning. It can be applied to the protection of high-temperature components.
Claims
1. A two-component air-spray coating resistant to 1000℃ high temperature is characterized by: Includes component A and component B; The mass fractions of each component in component A are as follows: High-temperature resistant silicone resins (20-40%) Packing material 1 20-40% Pigment 5-10% Filler 2 5-20% Solvent 20-40% Anti-settling agent 1-5% Dispersant 0.5-5% Leveling agent 0.5-3% Component B consists of a curing agent, dicumyl peroxide, and a solvent.
2. The air-spray coating resistant to 1000℃ high temperature according to claim 1, characterized in that: The high-temperature resistant silicone resin is one or more of the following: Longsheng Sihai Chemical SH9660 resin, SH9670 resin, SH9602 resin, SH5201 resin, SH5204 resin, SILIKOPHEN® AC1000 resin, and Dow 2403 resin.
3. The air-spray coating resistant to 1000℃ high temperature according to claim 1, characterized in that: The filler 1 is one or more of the following: kaolin, potassium feldspar powder, cordierite powder, glass powder, nano silica, nano titanium dioxide, boron nitride, silicon carbide, borax, YSZ, and ZrSi2; the pigment is one or more of the following: chrome green, copper chrome black, vanadium pentoxide, manganese iron black, strontium yellow phosphate, and titanium dioxide.
4. The air-spray coating resistant to 1000℃ high temperature according to claim 1, characterized in that: The filler 2 is one or more of titanium powder, chromium powder, nickel powder, and silicon powder; the particle size of the filler 2 is 0.2μm to 30μm.
5. The air-sprayed high-temperature coating resistant to 1000℃ according to claim 1, characterized in that: The solvent is one or more of xylene, cyclohexanone, n-butanol, butyl acetate, and ethyl acetate.
6. The air-sprayed high-temperature coating resistant to 1000℃ according to claim 1, characterized in that: The anti-settling agent is one or more of organobentonite 908, bentonite C61, fumed silica, and polyvinylidene fluoride; the dispersant is one or more of BYK-104s, BYK-161, BYK163, and BYK180; and the leveling agent is one or more of BYK-356, BYK-333, BYK-306, and BYK-358N.
7. The air-spray coating resistant to 1000℃ high temperature according to claim 1, characterized in that: The curing agent of component B is one or more of the following: polysilazane 108, polysilazane 118, polysilazane 115, polysilazane SPN1, polysilazane SPN2, polysilazane ZGA02, polysilazane ZGA01, polysilazane ZGCO1, polysilazane TC-P11, and polysilazane TC-P03.
8. The air-spray coating resistant to 1000℃ high temperature according to claim 1, characterized in that: The preparation method of the coating component A is as follows: Component A is added to a rapid disperser in proportion except for filler 2 and dispersed for 4 hours. The rapidly dispersed component is mixed with filler 2 and then dispersed in a high-speed disperser for 2 hours. After filtration through an 80-mesh filter, component A is obtained. The preparation method of component B of the coating is as follows: prepare a polysilazane mixed solvent with a solid content of 30%, add 0.3wt% dicumyl peroxide of polysilazane, and disperse at high speed at 750r / min for 2h to obtain component B.
9. The method for preparing an air-sprayed high-temperature resistant coating of 1000℃ according to claim 1, characterized in that: The components A and B are prepared in a mass ratio of A:B = 10:1 to 3, and after high-speed dispersion, a high-temperature coating resistant to 1000℃ is obtained.
10. The method for application and curing of an air-sprayed coating resistant to 1000℃ high temperature according to claim 1, characterized in that: The coating is applied to the substrate by air spraying. After it is surface dry, it is placed in a 150℃ oven for 2 hours to cure. Then it is transferred to a 350℃ muffle furnace for another 2 hours to cure. Finally, it is heat-treated at 1000℃ for 15 minutes to obtain a coating resistant to 1000℃ high temperature.