(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)
摘 要: 采用热压烧结工艺制得了2%C/MoSi2(质量分数)复合材料，并测定了材料的显微组织和结构、室温和高温力学性能、耐磨性能以及电阻率。结果表明：C/MoSi2复合材料由大量的MoSi2、多量的Mo5Si3和少量的β-SiC组成，其硬度Hv为1 060，抗弯强度为470 MPa，断裂韧性为5.12 MPa·m1/2，800 ℃的硬度Hv为750，1 200 ℃的抗压强度为450 MPa，1 400 ℃的抗压强度为142 MPa; 在Al2O3和SiC磨盘上表现出优异的耐磨性能，材料的电阻率为349 nΩ·m。与纯MoSi2相比，2% C/MoSi2复合材料在硬度、抗弯强度、断裂韧性、高温抗压强度、弹性模量和耐磨性能等方面都有较大的提高。
关键字: 二硅化钼; 碳; 复合材料; 力学性能
molybdenum-disilicide 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,
HighshHiroshima, 739-8527, Japan）
Abstract:Carbon reinforced molybdenum-disilicide composite (2%C/MoSi2) was fabricated by hot press sintering successfully. The microstructure, the mechanical properties at room temperature and at elevated temperature, the wear resistance and the resistivity of the composite were determined. C/MoSi2 composite has a phase constituent with much Mo5Si3 and β-SiC in MoSi2 matrix. The flexural strength, fracture toughness and Vickers hardness at room temperature are 470 MPa, 5.12 MPa·m1/2 and 1 060 Hv respectively. The compressive yield strength of the composite decreases from 450 MPa (1 200 ℃) to 142 MPa(1 400 ℃), Vickers hardness at 800 ℃ is 750 Hv. The wear resistance abraded on Al2O3 and SiC grind wheel is very excellent, and the resistivity is 34.9 μΩ·m.Compared with unreinforced MoSi2, C/MoSi2 composite has been improved at hardness, flexural strength, fracture toughness, compressive yield strength at elevated temperature, elastic modulus and wear resistance obviously.
Key words: molybdenum-disilicide; carbon; composite; mechanical properties
