采用热压工艺制备了SiO2－Si3N4复合材料，其抗弯强度和断裂韧性达到143MPa和1.7MPa·m1／2.比基体SiO2材料分别提高107％和70％.复合材料性能的改善是由于高弹性模量的Si3N4引入以及SiO2和Si3N4热膨胀系数不匹配导致的残余应力.
SiO2-Si3N4 composites were prepared by hot pressing process. Their flexural strength and fracture toughness obtained are 143MPa and 1.7MPa.m1/2, which are 107% and 70% higherthan those of the SiO2 matrix material respectively. The addition of higher elastic modulus Si3N4 particulates and the residual stress caused by the difference in thermal expansion coefficient of Si3N4 and SiO2 are the main reason responsible for the improvement of mechanical properties of the composites.
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