用真空热压法制备了Si3N4颗粒和纳米SiC晶须强韧化MoSi2基复合材料.采用X射线衍射仪、金相显微镜、扫描电镜分析了该材料的物相、微观组织结构和断口形貌,测算了其致密度、晶粒尺寸、抗弯强度和断裂韧性.结果表明:复合材料致密性好;添加的Si3N4和SiC与基体有着很好的化学相容性;与纯MoSi2相比,复合材料晶粒明显细化,抗弯强度和断裂韧性明显增加.其中MoSi2+20%Si3N4+10%SiC抗弯强度达400MPa,比纯MoSi2提高了58.7%;断裂韧性达6.1MPa·m1/2,比纯MoSi2提高了108.9%.复合材料的强化机制为细晶强化和弥散强化;韧化机制为细晶韧化、裂纹偏转和裂纹微桥接.
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