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无机材料学报

• 研究论文 • 上一篇    下一篇

Al对热压MoSi2材料显微结构的影响

李建林; 江东亮; 谭寿洪   

  1. 中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室; 上海 200050
  • 收稿日期:1998-03-19 修回日期:1998-05-22 出版日期:1999-02-20 网络出版日期:1999-02-20

Effects of Al additions on Microstructure of Hot Pressed MoSi2

LI Jian-Lin; JIANG Dong-Liang; TAN Shou-Hong   

  1. State Key Lab of High Performance Ceramics cud Superfine Microstructure; Shanghai institute ofCeramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1998-03-19 Revised:1998-05-22 Published:1999-02-20 Online:1999-02-20

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摘要： 本文研究了添加Al对热压MoSi2材料显微结构的影响，提出了过渡气相烧结的概念．结果表明，Al可消除纯MOSi2材料中的SiO2相，生成Al2O3颗粒．Al原子的扩散引起MOSi2晶格膨胀．由于Al蒸汽排除了孤立气孔内影响烧结的残留气体，从而降低了烧结体的气孔率，同时，MOSi2晶格畸变也促进了烧结．Al粉添加量为3.5Wt％时气孔率最低．

关键词: 铝, 二硅化钼, 显微结构

Abstract: The effect of Al additions on the microstructure of hot pressed MoSi2 was studied, and the concept of transition-gas-phase-sintering was proposed. The results indicate
that the SiO2 phase on grain boundary is eliminated by the reaction of Al and SiO2 while the Al2O3 particles are produced, and
the MoSi2 lattice is changed because of the diffusion of Al atoms. Furthermore, the sintering is advanced because of the deformation of
MoSi2 lattice and the disappearance of residual gas which is replaced by Al vapor in isolated pores, so porosity is reduced. The porosity
is the lowest when Al additive is 3.5 wt%.

Key words: aluminium, molybdenum disilicide, microstructure

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