A ceramic matrix composite material for high-speed motor car brake disc and its preparation method

Abstract

The invention discloses a ceramic matrix composite material applied to a high-speed motor car brake disc and a preparation method of the ceramic matrix composite material. The ceramic matrix composite material consists of a gradient SiC matrix and a C / C framework, and is characterized in that the gradient SiC matrix consists of silicon carbide and carbon; the percentage of silicon carbide to carbon in the matrix is increased to be 100% from 0%; the C / C framework is prepared by depositing a layer of carbon matrix on a carbon fiber woven body, and using chloromethyl silane, dichloromethyl silane and trichloromethyl silane as precursors so as to obtain the SiC and C matrixes of different ratios by using a chemical vapor deposition method. The ceramic matrix composite material well combines the advantages of the C / C composite material and the C / SiC composite material, thermal stress caused by thermal shock can be effectively alleviated, the thermal shock resistance is obviously enhanced, and the ceramic matrix composite material has great application prospect in the high-speed motor car brake disc.

Description

technical field [0001] The invention relates to a ceramic-based composite material and a preparation method thereof, in particular to a ceramic-based composite material for high-speed train brake discs and a preparation method thereof. technical background [0002] The brake disc is a key component of the Class A braking system of a motor vehicle, and its performance is directly related to the safety and reliability of the motor vehicle operation. C / SiC (carbon fiber reinforced silicon carbide) ceramic matrix composite brake discs have a series of excellent performances such as corrosion resistance, wear resistance, oxidation resistance and high friction coefficient compared with the current C / C composite brake discs in service, but due to SiC The thermal expansion coefficient of the C / SiC composite is relatively large, and the severe thermal shock that the C / SiC composite material is subjected to in practical applications makes the C / SiC composite material easy to crack, an...

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Problems solved by technology

C / SiC (carbon fiber reinforced silicon carbide) ceramic matrix composite brake discs have a series of excellent performances such as corrosion resistance, wear resistance, oxidation resistance and high friction coefficient compared with the current C / C composite brake discs in service, but due to SiC The thermal expansion coefficient of C / SiC composites is relatively large, and the severe thermal shocks that C / SiC composites suffer in practical applications make C / SiC composites easy to crack and easily damage C fibers, seriously affecting their mechanical properties.