(1. 中南大学 粉末冶金国家重点实验室，长沙 410083；2. 安阳工学院，安阳 455000)
摘 要: 以微米级MoSi2粉末为原料，利用放电等离子烧结技术制备致密度达99%的MoSi2陶瓷材料。研究烧结温度对MoSi2陶瓷的致密化、微观结构和力学性能的影响。结果表明：SPS烧结技术制备的MoSi2陶瓷由MoSi2、少量的Mo5Si3和SiO2组成；随着烧结温度的升高，材料的致密化效果明显加强；当烧结温度为1600 ℃时，材料的综合性能最优，相对密度和抗弯强度达到98.9%和417 MPa。但当烧结温度达到1800 ℃时，致密度基本保持不变，MoSi2晶粒长大明显，材料抗弯强度降低。
关键字: MoSi2；放电等离子烧结；微观结构；力学性能
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Anyang Institute of Technology, Anyang 455000, China）
Abstract:Using MoSi2 micropowder as raw material, MoSi2 ceramics with relative density of 99% was prepared by spark plasma sintering. The effects of sintering temperature on the densification, microstructure and mechanical properties of MoSi2 ceramics were studied. The results show that the MoSi2 ceramics prepared by SPS are made of MoSi2 and a small amount of Mo5Si3 and SiO2. With the increase of sintering temperature, the relative density of product is improved apparently. When the sintering temperature is 1600 ℃, the comprehensive property of the products is optimal, and the relative density and bending strength are up to 98.9% and 417 MPa, respectively. When the sintering temperature rises to 1800 ℃, the relative density remains the same, while the bending strength reduces due to the grain size growth.
Key words: MoSi2; spark plasma sintering; microstructure; mechanical property
