SiC/SiC composite material surface coating system and preparation method thereof

A composite material and surface coating technology, which is applied in the field of coating system and its preparation, can solve problems such as the inability to improve the performance of SiC/SiC composite materials, and achieve reliability and overall service life, reliability and stability. Effect

Inactive Publication Date: 2017-11-17
CHINA BUILDING MATERIALS ACAD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Simply relying on the performance optimization of ceramic matrix composites or a single-function protective coating cannot improve the performance of SiC / SiC composites and eliminate these potential safety hazards. Therefore, it is urgent to develop composite sealing coatings to realize SiC / SiC composites. oxidation

Method used

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  • SiC/SiC composite material surface coating system and preparation method thereof

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preparation example Construction

[0025] An embodiment of the present invention proposes a method for preparing a SiC / SiC composite surface coating system, which includes:

[0026] 1) Dip the SiC / SiC composite substrate in a polyborosilazane solution, solidify, dry, and pyrolyze at 700-900°C to obtain a SiC / SiC composite substrate with an anti-oxidation film on the surface;

[0027] Since the SiC / SiC composite material is a brittle material composite material, it is easy to produce microcracks under thermal shock. Firstly, a layer of Si-B-C-N multiphase system is used to seal the composite material fiber and matrix on the surface of the composite material by pyrolysis of polyborosilazane. Microcracks generated on the surface, the B element in it can react with oxygen to form glassy B in a high-temperature aerobic environment 2 o 3 , to heal microcracks in the composite system;

[0028] 2) dispersing the nano-SiC powder in a mixed solvent of polycarbosilane and xylene to obtain a slurry; wherein the weight ra...

Embodiment 1

[0035] An embodiment of the present invention proposes a method for preparing a SiC / SiC composite surface coating system, which includes:

[0036] 1) Dip the SiC / SiC composite substrate in polyborosilazane solution, add 5kg / cm 2 The pressure was repeated 3 times, then pressurized and dried at 100°C for 0.5h, and pyrolyzed at 700°C for 1h to obtain a SiC / SiC composite substrate with an anti-oxidation film on the surface;

[0037] 2) nano-SiC powder is dispersed in the mixed solvent of polycarbosilane and xylene, obtains slurry; Wherein, the weight ratio of nano-SiC powder, polycarbosilane and xylene is 2:6:4; Said The SiC / SiC composite material substrate with the surface anti-oxidation film is immersed in the slurry, and the pressure is 10kg / cm 2 , repeated 3 times, dried at 100°C for 3h, then put the sample into a vacuum sintering furnace at 1000°C for polycarbosilane ceramicization, the newly formed β-SiC and nano-SiC powder filled together the pores in the composite materia...

Embodiment 2

[0043] An embodiment of the present invention proposes a method for preparing a SiC / SiC composite surface coating system, which includes:

[0044] 1) Dip the SiC / SiC composite substrate in polyborosilazane solution, add 5kg / cm 2 The pressure was repeated 3 times, then pressurized and dried at 100°C for 0.5h, and pyrolyzed at 900°C for 1 hour to obtain a SiC / SiC composite substrate with an anti-oxidation film on the surface;

[0045] 2) nano-SiC powder is dispersed in the mixed solvent of polycarbosilane and xylene, obtains slurry; Wherein, the weight ratio of nano-SiC powder, polycarbosilane and xylene is 5:6:4; Said The SiC / SiC composite material substrate with the surface anti-oxidation film is immersed in the slurry, and the pressure is 10kg / cm 2 , repeated 3 times, dried at 100°C for 3h, then put the sample into a vacuum sintering furnace at 1200°C for polycarbosilane ceramicization, the newly formed β-SiC and nano-SiC powder filled together to fill the pores in the compo...

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Abstract

The invention relates to a SiC/SiC composite material surface coating system and a preparation method thereof. The preparation method comprises the following steps: 1, impregnating a SiC/SiC composite material substrate in a polyborosilazane solution, curing the impregnated substrate, drying the cured substrate, and pyrolyzing the dried substrate to obtain a SiC/SiC composite material substrate having a surface anti-oxidation film; 2, dispersing SiC nano-powder in a polycarbosilane and xylene mixed solvent to obtain a slurry, impregnating the SiC/SiC composite material substrate having the surface anti-oxidation film in the slurry, curing the impregnated substrate, drying the cured substrate, and pyrolyzing the dried substrate to obtain a SiC/SiC composite material substrate having a plugging layer; and 3, making a gradient anti-oxidation coating layer on the SiC/SiC composite material substrate having the plugging layer through adopting a chemical vapor deposition technology to obtain the SiC/SiC composite material surface coating system. The SiC/SiC composite material surface coating system has a good anti-oxidation property and a good stability, and ensures the reliability and the integral service life of an engine and an aircraft.

Description

technical field [0001] The invention relates to a coating system and a preparation method thereof, in particular to a SiC / SiC composite material surface coating system and a preparation method thereof. Background technique [0002] my country urgently needs a large thrust-to-weight ratio aero-engine to meet the application requirements of the new generation of fighters. At present, it is generally used to increase the temperature of the front inlet of the turbine (data shows that under the condition of constant engine size, the thrust-to-weight ratio can be increased for every 100°C increase in the temperature of the front inlet of the turbine. Increase by 10%) and reduce the structural weight of the engine to increase the thrust-to-weight ratio of the engine. Silicon carbide fiber reinforced silicon carbide (SiC / SiC) composite material has the following advantages: (1) Low density, the density of SiC / SiC composite material is 2-3g / cm 3 , which is about 1 / 4-1 / 3 of the alloy,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89
CPCC04B41/89C04B41/009C04B41/52C04B2111/00982C04B2111/763C04B35/806C04B41/5053C04B41/4554C04B41/5059C04B41/4531
Inventor 霍艳丽刘海林杨泰生陈玉峰胡传奇黄小婷贾志辉唐婕
Owner CHINA BUILDING MATERIALS ACAD
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