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Growth mechanism of Y α-SiAlON whiskers prepared by combustion synthesis

Published online by Cambridge University Press:  01 April 2005

Guanghua Liu ,
Kexin Chen ,
Heping Zhou ,
Xiaoshan Ning ,
C. Pereira  and
J.M.F. Ferreira
Guanghua Liu*
Affiliation:
Department of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, People's Republic of China
Kexin Chen
Affiliation:
Department of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, People's Republic of China
Heping Zhou
Affiliation:
Department of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, People's Republic of China
Xiaoshan Ning
Affiliation:
Department of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, People's Republic of China
C. Pereira
Affiliation:
Department of Ceramics and Glass Engineering, University of Aveiro, CICECO, 3810-193 Aveiro, Portugal
J.M.F. Ferreira
Affiliation:
Department of Ceramics and Glass Engineering, University of Aveiro, CICECO, 3810-193 Aveiro, Portugal
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Novel Y α-SiAlON whiskers with high aspect ratios were prepared by combustion synthesis, except for common isotropic grains. The growth process of whiskers was investigated, and experimental results showed that the predominant growth mode of whiskers was the vapor–liquid–solid (VLS) mechanism. In contrast to the usual situation, here the liquid phase played two roles during the growth of Y α-SiAlON whiskers; that is to say, in addition to acting as a medium for mass transportation, the liquid phase took part in reactions itself. It was also found that proper addition of Fe2O3 could facilitate the development of whiskers with no remarkable deterioration on the phase assemblage of combustion products.

Keywords

CeramicCombustion synthesisGrain growth
Type
Research Article
Information
Journal of Materials Research , Volume 20 , Issue 4 , April 2005 , pp. 889 - 894
Copyright
Copyright © Materials Research Society 2005

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References

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