本文研究了原位SiC颗粒增强MoSi2基复合材料的组织结构和力学性能结果表明:复合材料的组织为t-MoSi2基体上均匀分布β-SiC等轴颗粒,数量很少的球形小孔隙主要分布在SiC颗粒内,SiC颗粒尺寸为2-5μm.复合材料界面为直接的原子结合,无非晶层存在.复合材料的室温维氏硬度、断裂韧性、抗压强度及高温流变应力明显高于单一MoSi2,随着SiC体积分数的增加,维氏硬度、断裂韧性及高温流变应力提高,而抗压强度先增加后减少SiC体积分数从10%增加到45%,KIC从4.34提高到5.71 MPa@m1/2,与单一MoSi2相比提高了25%-46%;1400℃时,σ0.2从20%SiC的230提高到45%SiC的285 MPa,比单一MoSi2提高了98%-146%.
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