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中文摘要：
通过粉末冶金方法制备了Mo5Si3/MoSi2和La2O3/Mo5Si3/MoSi2复合材料,探讨了其烧结工艺.检测了其密度、维氏硬度、抗弯强度和断裂韧性,运用X射线衍射仪和扫描电镜（SEM）研究了La2O3对Mo5Si3/MoSi2复合材料显微结构和力学性能的改性影响.结果表明,La2O3/Mo5Si3/MoSi2复合材料的合理烧结温度为1600 ℃,比MoSi2材料提高了100 ℃; 稀土氧化物的加入细化了晶粒,且明显提高了材料的致密度、维氏硬度和抗弯强度; 其强化机制为细晶强化和弥散强化; 韧化机制为细晶韧化、裂纹偏转、裂纹分支和微桥接.
英文摘要：
MosSi3/MoSi2 and La2O3/Mo5Si3/MoSi2 composites were prepared by PM technique. Their density, Vickers-hardness, flexural strength and fracture toughness were measured. The sintering technology, mechanical properties and microstructures of Mo5Si3/MoSi2 with and without La2O3 were investigated. Results showed that the appropriate sintering temperature of La2O3/Mo5Si3/MoSi2 composites was 1600 ℃, which was 100 ℃ higher than that of MoSi2 Addition of La2O3 may refine grain of MoSi2 matrix composites, and distinctly increased their density, Vickers-hardness and flexural strength. The strengthening mechanisms dispersion of La2O3/Mo5Si3/MoSi2 were strengthening. Their tough fine-grain and ening mechanisms were fine-grain toughening, crack deflection, crack branching and crack microbfidging.
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