SiC/SiC composite material high-density multilayer matrix and preparation method thereof

Abstract

The invention relates to a SiC / SiC composite material high-density multilayer matrix and a preparation method thereof. Prepared SiC particle (SiCp) slurry is introduced into a porous SiC / SiC composite material through vacuum impregnation and pressure impregnation methods, then a certain content of pyrolytic carbon is prepared in the porous SiC / SiC composite material by adopting a CVI method, the SiC particles are uniformly wrapped by the pyrolytic carbon, and finally, densification of the SiC / SiC composite material is completed through reaction of pyrolytic carbon and molten silicon by adopting an RMI method. SiC particles with different particle sizes are sequentially introduced to form a layered structure, so that a genetic effect is generated on subsequently prepared PyC and SiC matrixes, a uniform SiC matrix phase with a high volume fraction is obtained, the density of the composite material is increased, the energy of crack propagation is increased, and the mechanical property of the composite material is effectively improved. The composite material prepared by the method has a SiC matrix phase with high volume fraction and uniform distribution, high mechanical property and low open porosity, and solves the problems of low SiC phase content, non-uniform distribution and insufficient toughness in the SiC / SiC matrix prepared by the existing RMI process method.

Description

technical field

[0001] The invention belongs to a preparation method of a composite material, and relates to a SiC / SiC composite material high-density multilayer matrix and a preparation method. Background technique

[0002] Due to its high temperature resistance, wear resistance, corrosion resistance, high specific strength, high specific modulus, high toughness, creep resistance and many other advantages, SiC / SiC composite materials have great application prospects in aerospace thermal structural components and other fields. With the continuous development of my country's aerospace industry, the thrust-to-weight ratio of the engine is gradually increasing, the high bypass ratio, the total pressure ratio are constantly increasing, the service temperature is higher, the stress requirements are higher, and the corrosive environment, SiC is used for the hot end structural parts of the engine / SiC composites require higher strength and toughness, higher damage tolerance, and hig...

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