摘要
以钼、硅、碳粉末为原料,采用湿法混合和原位反应热压一次复合工艺制备了MoSi2以及含不同体积分数原位SiC颗粒的SiCP/MoSi2复合材料,并研究了原位SiC颗粒对该材料室温断裂韧度的影响。结果表明:复合后的SiCP/MoSi2室温断裂韧度大幅度提高,原位SiC颗粒可以细化MoSi2基体晶粒,减少和消除脆性的SiO2玻璃相,并阻碍SiCP/MoSi2复合材料断裂时的裂纹扩展而造成裂纹的偏转和桥接。
MoSi2 and SiCP/MoSi2 composites reinforced with different volume fractions of in-situ SiC particles were fabricated by means of in-situ reaction and hot press synthesis after wet mixing pure powders of Mo, Si and C. The effects of in-situ SiC particles on room-temperature fracture toughness of the composites were investigated. The room-temperature fracture toughness of the SiCp/MoSi2 composite increases, and the in-situ SiC particles refine the MoSi2 grains and eliminates the brittle SiO2 glass, resulting in crack deflection and bridging during the crack extension.
出处
《机械工程材料》
CAS
CSCD
北大核心
2007年第8期42-44,78,共4页
Materials For Mechanical Engineering
