SiCf/SiC composite material and preparation method thereof

Abstract

The invention relates to a SiCf/SiC composite material and a preparation method thereof. The preparation method comprises the following steps: (1) mixing carbon black and silicon carbide micro powderwhich are used as solid phases with water, adding an adjuvant agent, performing ball grinding for mixing, mechanically stirring the mixture in vacuum, and debubbling the mixture to obtain dipping slurry; (2) dipping silicon carbide fiber cloth in the dipping slurry for vacuum-pressure dipping to obtain a fiber cloth dipped material, starching the fiber cloth dipped material for thicknessing, adhering and stacking the material, burying the material with water-absorbent resin, placing the material into a mold for cold isostatic pressing, and drying and thermally treating the mold to obtain a carbon-containing preform, wherein a silicon carbide fiber contains a boron nitride interface; (3) performing reactive melt infiltration on the carbon-containing preform, thus obtaining the SiCf/SiC composite material. The preparation method can be simplified, the production energy consumption can be reduced, and the production efficiency can be improved; pore defects in the carbon-containing preformcan be substantially reduced, so that the compactness of the SiCf/SiC composite material is increased, and the content of residual silicon is reduced at the same time.

Description

technical field [0001] The invention relates to the field of preparation of a ceramic matrix composite material, in particular to a SiC f / SiC composite material and its preparation method. Background technique [0002] Continuous silicon carbide fiber reinforced silicon carbide ceramic matrix composites (SiC f / SiC composite material) has excellent properties such as low density, high strength, high oxidation resistance, and high temperature resistance. ideal material. SiC f The application of / SiC composite materials will have significant advantages in improving the thrust-to-weight ratio, increasing the operating temperature, reducing ineffective weight, and simplifying the system structure. SiC f The research and development of SiC / SiC composite materials is one of the most active fields in the research work of ultra-high temperature ceramic matrix composite materials. [0003] Currently, SiC f The preparation methods of / SiC composite materials mainly include che...

AI Technical Summary

Problems solved by technology

However, the existing technologies generally have the following disadvantages: 1) The preparation technology of carbon-containing preforms mainly includes processes such as chemical vapor infiltration and precursor impregnation and cracking. Precursor impregnation and pyrolysis technology has inherent defects in the preparation of carbon-containing preforms, and it is difficult to achieve homogenization; in the vacuum-pressure impregnation slurry method, due to the existence of fibers and high viscosity of the slurry, the existing impregnation The pressure is generally low, and it is difficult to completely remove the bubbles, forming dry pore defects; 3) It is common in composite materials based on chemical vapor infiltration and precursor impregnation cracking and sintering, which reduces the oxidation resistance of composite materials

In addition, the existing reaction infiltration sintered composites contain a lot of free silicon, which reduces the mechanical properties of the composites