Influence of spark plasma sintering temperature on sintering behavior and microstructures of dense bulk MoSi2

被引：0
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作者：
Hu, Qiaodan [1 ]
Luo, Peng [2 ]
Yan, Youwei [1 ]
机构：
[1] State Key Laboratory of Materials Processing and Die and Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, China
[2] School of Mechanical Engineering, Southern Yangtze University, Wuxi, 214122, China
来源：
Journal of Alloys and Compounds | 2008年 / 459卷 / 1-2期
关键词：
Spark plasma sintering was employed to synthesize high-density bulk MoSi2 in one step; using Mo and Si element powders as starting materials. Influence of sintering temperature on sintering behavior and microstructures of MoSi2 were investigated. The sintering behavior at whatever temperature (1473; 1673 and 1873 K) is characterized by four stages; i.e; initial expansion; slight shrinkage; abrupt shrinkage and slight expansion. The maximum shrinkage displacement increased with increasing sintering temperature. When the sintering temperature reaches 1673 K or 1873 K; the second phases; SiO2 and Mo5Si3/Mo4.8Si3C0.6; were uniformly distributed in the synthesized MoSi2 matrix accompanied with a small amount of porosity. Most of SiO2 and Mo5Si3/Mo4.8Si3C0.6 particles were concentrated at grain boundaries. The relative density of the products (atomic ratio: Mo/2.00Si) was improved tremendously from 89% to 98.2% over the range 1473-1673 K; and much smaller enhancement up to 99.0% was achieved from 1673 to 1873 K. At the same time; the grain size and amount of second phase particles (mainly Mo5Si3/Mo4.8Si3C0.6) consistently increased with increasing temperature over 1473-1873 K. However; the use of a slight excess of Si (e.g; atomic ratio: Mo/2.06Si) at 1673 K resulted in dense products of MoSi2 nearly free of Mo5Si3/Mo4.8Si3C0.6; with the relative density of 99.2% and the average grain size of 5-10 μm. Thereby; in order to pursue an equilibrium among densification; microstructural refinement and formation of second phases; the most suitable sintering temperature and stoichiometry for fabrication of MoSi2 by SPS are recommended to be 1673 K and a hyperstoichiometry of Mo/2.06Si in the present work. © 2007 Elsevier B.V. All rights reserved;
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页码：163 / 168
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