(1.中南大学 粉末冶金国家重点实验室， 长沙 410083；
2. 广岛大学 工学部机械系， 广岛1-4-1 739-8527， 日本)
摘 要: 通过热压烧结工艺制得了(SiCp+C)/ MoSi2复合材料，分析了材料的组织结构、室温和高温力学性能。结果表明：(SiCp+C)/MoSi2复合材料主要由MoSi2(大量)、α-SiCp(大量)、Mo5Si3(多量)和β-SiC(少量)组成，密度为5.12g/cm3，相对密度为91%； 增强相的粒径<30μm，体积分数为39％。材料室温硬度、抗弯强度和断裂韧性分别为12.2GPa，530MPa和7.2 MPa·m1/2；在800 ℃的维氏硬度为8.0 GPa，1 200 ℃和1 400 ℃的抗压强度分别为560 MPa和160 MPa。与非增强MoSi2相比，材料的各种力学性能都有大幅度的提高。
关键字: 二硅化钼； 碳化硅； 碳； 复合材料； 力学性能
of (SiCp+C)/MoSi2 composite
（1. State Key Laboratory for Powder Metallurgy，
Central South University， Changsha 410083， P.R.China;
2. Department of Mechanical Engineering， Hiroshima University，
Kagamiyama 1-4-1， HigashHiroshima， 739-8527， Japan）
Abstract: SiC particle with carbon reinforced molybdenum-disilicide (MoSi2) matrix composite had been fabricated by hot press sintering, and the microstructure， the mechanical properties at room temperature and at elevated temperature of the composite were measured. (SiCp+C)/MoSi2 composite has a phase constituent with very much α-SiC， much Mo5Si3 and less β-SiC in MoSi2 matrix. The density and the relative density of the composite are 5.12 g/cm3 and 91.0%. The reinforced phase of the composite has a size less than 30μm and the total volume fraction of the reinforced phase is 39%. The Vickers hardness， the flexural strength and the fracture toughness of the composite at room temperature are 12.2 GPa， 530*!MPa and 7.2 MPam1/2， respectively. The Vickers hardness is 8.0 GPa at 800 ℃， the compressive yield strength are 560 MPa and 160 MPa at 1 200 ℃ and at 1 400 ℃， respectively. As compared with unreinforced MoSi2， all properties of (SiCp+C)/MoSi2 composite have been enhanced notably.
Key words: molybdenum-disilicide; silicon carbide; carbon; composite; mechanic properties
