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J Mater Sci Technol  1999, Vol. 15 Issue (06): 578-580    DOI:
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Effects of Al Additions on Microstructure and Mechanical Properties of MoSi2
Jianlin LI, Dongliang JIANG, Shouhong TAN
Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China
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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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Received:  15 October 1998     
Corresponding Authors:  Jianlin LI     E-mail:  jlli@guomail.sh.cn

Cite this article: 

Jianlin LI, Dongliang JIANG, Shouhong TAN. Effects of Al Additions on Microstructure and Mechanical Properties of MoSi2. J Mater Sci Technol, 1999, 15(06): 578-580.

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https://www.jmst.org/EN/     OR     https://www.jmst.org/EN/Y1999/V15/I06/578

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