用放电等离子烧结法(SPS)制备了不同增强相的MoSi2基复合材料,系统研究了第二相对MoSi2基复合材料组织与性能的影响,探讨了MoSi2基复合材料的断裂方式及增韧机制.结果表明:第二相颗粒的加入均能不同程度地提高MoSi2的强韧性;ZrO2对提高断裂韧性最有效.其中20%ZrO2/MoSi2材料达到6.8 Mpam1/2,比纯MoSi2提高了95.4%,表现为微裂纹增韧和弥散强化;β-Si3N4对提高显微硬度、抗压强度最有效,其中20%β-Si3N4/MoSi2分别达到16.01Gpa与2260Mpa,比纯MoSi2提高了31.7%与119.4%,表现为细晶强化;同时加入ZrO2与β-Si3N4能起到相变增韧和细晶强化的协同作用,表现出最佳的强韧性能,其中,10%ZrO2/20%β-Si3N4/MoSi2的维氏硬度、抗压强度、断裂韧性分别比MoSi2提高了24.7%、104.3%、90%.
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