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Microstructure evolution and mechanical strength of silicon nitride ceramics

Published online by Cambridge University Press:  03 March 2011

Y. Iwamoto ,
H. Nomura ,
I. Sugiura ,
J. Tsubaki ,
H. Takahashi ,
K. Ishikawa ,
N. Shinohara ,
M. Okumiya ,
T. Yamada  and
H. Kamiya
...Show all authors
Y. Iwamoto
Affiliation:
JFCC, Mutsuno, Astutaku, Nagoya, Japan
H. Nomura
Affiliation:
JFCC, Mutsuno, Astutaku, Nagoya, Japan
I. Sugiura
Affiliation:
JFCC, Mutsuno, Astutaku, Nagoya, Japan
J. Tsubaki
Affiliation:
JFCC, Mutsuno, Astutaku, Nagoya, Japan
H. Takahashi
Affiliation:
Asahi Glass Co., Hazawa, Kanagawaku, Yokohama, Japan
K. Ishikawa
Affiliation:
Asahi Glass Co., Hazawa, Kanagawaku, Yokohama, Japan
N. Shinohara
Affiliation:
Asahi Glass Co., Hazawa, Kanagawaku, Yokohama, Japan
M. Okumiya
Affiliation:
Asahi Glass Co., Hazawa, Kanagawaku, Yokohama, Japan
T. Yamada
Affiliation:
Ube Industries, Ube, Japan
H. Kamiya
Affiliation:
Department of Chemical Engineering, Nagoya University, Nagoya, Japan
K. Uematsu*
Affiliation:
Department of Chemistry, Nagaoka University of Technology, Nagaoka, Japan
*
a)Address all correspondence to this author.
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Abstract

Microstructure evolution was studied in silicon nitride ceramics by a novel characterization method, and its relevance to the strength was discussed. The characterization method involves an immersion liquid for making green and partially sintered bodies transparent, and a subsequent direct optical microscopic examination. Granules for compaction process were prepared with the spray-drying process and were found to contain pores or deep dimples. Green bodies formed by CIP with these granules contain regularly arrayed pores at the center of granules and also crack-like voids at the boundaries of granules. These pores were preserved in the sintering process and resulted in large pores in the sintered body. They behave as fracture origin in ceramics and reduce the fracture strength. The Weibull modulus was high due to the presence of uniformly distributed pores.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 5 , May 1994 , pp. 1208 - 1213
Copyright
Copyright © Materials Research Society 1994

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References

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