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Effect of α/β phase ratio on microstructure and mechanical properties of silicon nitride ceramics

Published online by Cambridge University Press:  31 January 2011

Hirokazu Kawaoka ,
Tomohiko Adachi ,
Tohru Sekino ,
Yong-Ho Choa ,
Lian Gao  and
Koichi Niihara
Hirokazu Kawaoka
Affiliation:
Institute of Scientific and Industrial Research, Osaka University, 8–1 Mihogaoka, Ibaraki, Osaka 567–0047, Japan
Tomohiko Adachi
Affiliation:
Institute of Scientific and Industrial Research, Osaka University, 8–1 Mihogaoka, Ibaraki, Osaka 567–0047, Japan
Tohru Sekino
Affiliation:
Institute of Scientific and Industrial Research, Osaka University, 8–1 Mihogaoka, Ibaraki, Osaka 567–0047, Japan
Yong-Ho Choa
Affiliation:
Institute of Scientific and Industrial Research, Osaka University, 8–1 Mihogaoka, Ibaraki, Osaka 567–0047, Japan
Lian Gao
Affiliation:
Institute of Scientific and Industrial Research, Osaka University, 8–1 Mihogaoka, Ibaraki, Osaka 567–0047, Japan
Koichi Niihara
Affiliation:
Institute of Scientific and Industrial Research, Osaka University, 8–1 Mihogaoka, Ibaraki, Osaka 567–0047, Japan
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Abstract

Highly densed silicon nitride ceramics with various α/β phase ratios were produced by pulse electric current sintering process. The β-phase content of Si3N4 in sintered materials varied from 20 to 100 wt% depending on the sintering condition. The microstructure was observed by scanning electron microscopy and investigated by image analysis. Young's modulus, hardness, fracture toughness, and strength were strongly dependent on the α/β phase ratio. The fracture toughness increased from 4.6 MPa m1/2 for 20-wt% b-phase content to 8.2 MPa m1/2 for 95-wt% β-phase content, and the fracture strength showed a maximum value of about 1.6 GPa at 60-to-80-wt% β-phase content.

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Articles
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Journal of Materials Research , Volume 16 , Issue 8 , August 2001 , pp. 2264 - 2270
Copyright
Copyright © Materials Research Society 2001

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