J. Mater. Sci. Technol. ›› 1999, Vol. 15 ›› Issue (06): 578-580.

• 论文 • 上一篇    下一篇

Effects of Al Additions on Microstructure and Mechanical Properties of MoSi2

Jianlin LI, Dongliang JIANG, Shouhong TAN   

  • 收稿日期:1998-10-15 修回日期:1999-01-04 出版日期:1999-11-28 发布日期:2009-10-10

Effects of Al Additions on Microstructure and Mechanical Properties of MoSi2

Jianlin LI, Dongliang JIANG, Shouhong TAN   

  1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China
  • Received:1998-10-15 Revised:1999-01-04 Online:1999-11-28 Published:2009-10-10
  • Contact: Jianlin LI

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Abstract: The effects of Al additions on the microstructure and mechanical properties of MoSi2 have been studied. With the Al additions from 2.5 wt pct to 5 wt pct, the siliceous grain boundary phase in hot pressed samples was eliminated because of the formation of Al2O3 particles. It was shown that Al and SiO2 reacted at 860℃. During the reaction, Al atoms were mainly transferred to Al2O3 particles, and to some extent, diffused into MoSi2 grains. Both the toughness and strength of Al containing composites exceeded those of pure MoSi2 material. Bending strength and fracture toughness reach the highest value of 350 MPa, 4.05 MPa•m1/2, respectively, at ambient temperature when Al addition was of 3.5 wt pct.

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