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Effect of Impurities on Silicon Nitride Whiskers Synthesized from Silica-Containing Natural Substances

Published online by Cambridge University Press:  31 January 2011

Takeshi Hashishin ,
Hiroshi Iwanaga  and
Yoshifumi Yamamoto
Takeshi Hashishin
Affiliation:
Department of Material Science and Engineering, Faculty of Engineering, Nagasaki University, Nagasaki 852-8521, Japan
Hiroshi Iwanaga
Affiliation:
Department of Material Science and Engineering, Faculty of Engineering, Nagasaki University, Nagasaki 852-8521, Japan
Yoshifumi Yamamoto
Affiliation:
Department of Materials Science and Engineering, Faculty of Science and Engineering, Ritsumeikan University, 525-8577, Japan
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Abstract

Silicon nitride (Si3N4) whiskers were synthesized via a carbothermal reduction and nitridation process from silica-containing natural substances, such as volcanic ash, diatomaceous earth, white sand, and rice hull, using the flux effect of cryolite. It was clarified that the volcanic ash, whose Fe2O3 content contributed to the formation ratio of the α-type, was suitable as a raw material for the synthesis of Si3N4 whiskers. Fe2O3, Al2O3, and TiO2 contributed to the growth in the whisker-axis direction by the formation of droplets inducing the vapor-liquid-solid mechanism. CaO and MgO led to an increase in the diameter of the whiskers by vapor-solid and vapor-liquid-solid mechanisms, and the Fe2O3 content was the highest in the volcanic ash, whose Fe2O3 content was the highest among the natural substances.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 12 , December 2003 , pp. 2760 - 2764
Copyright
Copyright © Materials Research Society 2003

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