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Influence of sintering atmosphere on the fabrication of SiC ceramics with a powder mixture of sialon composition

Published online by Cambridge University Press:  31 January 2011

Jong-Kook Lee ,
Jong-Gon Park ,
Eun-Gu Lee  and
Kyung-Seok Kim
Jong-Kook Lee*
Affiliation:
School of Metallurgical and Materials Engineering, Chosun University, Kwang-ju 501–759, Korea, and B.K21 Development of Intelligent Materials & Its Application, Kwang-ju 501–759, Korea
Jong-Gon Park
Affiliation:
School of Metallurgical and Materials Engineering, Chosun University, Kwang-ju 501–759, Korea, and B.K21 Development of Intelligent Materials & Its Application, Kwang-ju 501–759, Korea
Eun-Gu Lee
Affiliation:
School of Metallurgical and Materials Engineering, Chosun University, Kwang-ju 501–759, Korea, and B.K21 Development of Intelligent Materials & Its Application, Kwang-ju 501–759, Korea
Kyung-Seok Kim
Affiliation:
School of Mechanical Engineering, Chosun University, Kwang-ju 501–759, Korea
*
a)Address all correspondence to this author. e-mial: [email protected]
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Abstract

Silicon carbide ceramics with a powder mixture of sialon composition as a densification aid were prepared by hot pressing through a transient liquid phase, and the effects of sintering atmosphere and starting phases on the microstructural characteristics were investigated. The sintered SiC with the additive of a Y–α-sialon composition in argon showed high sintered density and grains with large aspect ratio. But sintered specimens in nitrogen yielded grains with low aspect ratio and small grain size, because of the retardation of phase transformation and grain growth. The SiC specimen prepared from the starting β–SiC powder with Y–α-sialon composition showed the highest fracture toughness of approximately 6.0 MPa m1/2.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 6 , June 2001 , pp. 1784 - 1788
Copyright
Copyright © Materials Research Society 2001

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