Research on the Preparation of Diamond Silicon Carbide Ceramic Matrix Composites by Sintering Diamond and Silicon
In order to improve the wear resistance and service life of diamond materials,the study prepares diamond/silicon carbide ceramic matrix composites using Si3N4 as the matrix material and diamond powder grown by CVD as the reinforcing phase.The study analyzes sintering process of SiC/Ce-SiC/Si3N4 ceramic matrix composites,and explores the effects of sintering temperature,holding time,etc.on their microstructure and mechanical properties.The results indicate that,as the sintering temperature increases,the density of the composite material continues to increase.When the sintering temperature is 1000 ℃,the density of the composite material is the highest,reaching 98.7％.The higher the sintering temperature is,the more severe the agglomeration phenomenon of SiC particles and the smaller the grain size are.When the insulation time is 20 min,the composite material reaches a dense state,and at this time,the composite material contains more SiC particles.Therefore,by optimizing process parameters,diamond/silicon carbide ceramic matrix composites with excellent performance can be prepared to meet the requirements of aerospace applications.
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