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Low temperature sintering and elongated grain growth of 6H-SiC powder with AlB2 and C additives

Published online by Cambridge University Press:  31 January 2011

Hidehiko Tanaka  and
You Zhou
Hidehiko Tanaka*
Affiliation:
National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
You Zhou
Affiliation:
National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
*
a)Address all correspondence to this author. e-mail: tanakah@nirim.go.jp
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Abstract

6H(α)-SiC fine powder was sintered at normal pressure with additives of between 0.67 to 2.7 wt.% of AlB2 and 2 wt.% of C. The powder could be densified at 1850 °C. This sintering temperature was lower than that for SiC with B and C additives by 150–300 °C. During sintering, 6H-SiC partially transformed into 4H-SiC, and the transformation caused grain to grow and develop a nonspherical shape. The fracture toughness of sintered SiC increased with increases in the amount of AlB2 additive, the mean grain size, and the mean aspect ratio of grain shape. AlB2 and C additives are believed to have formed an Al8B4C7 compound which melted below 1800 °C and enhanced sintering and grain growth.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 2 , February 1999 , pp. 518 - 522
Copyright
Copyright © Materials Research Society 1999

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