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Direct Observation of Microstructure Change During Densification of Silicon Nitride Ceramics with A Novel Characterization Method

Published online by Cambridge University Press:  25 February 2011

Y. Iwamoto ,
H. Nomura ,
I. Sugiura ,
J. Tsubaki ,
H. Takahashi ,
K. Ishikawa ,
N. Shinohara ,
M. Okumiya ,
Y. Yamada  and
H. Kamiya
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Y. Iwamoto
Affiliation:
JFCC, Mutsuno, Atutaku, Nagoya, Japan
H. Nomura
Affiliation:
JFCC, Mutsuno, Atutaku, Nagoya, Japan
I. Sugiura
Affiliation:
JFCC, Mutsuno, Atutaku, Nagoya, Japan
J. Tsubaki
Affiliation:
JFCC, Mutsuno, Atutaku, 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
Y. 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
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Abstract

A novel characterization method is applied to study the evolution of microstructures during densification of silicon nitride ceramics. This characterization method involves an immersion liquid for making green and sintered bodies transparent, and a subsequent direct optical microscopic examination. Granules were prepared with the spray drying processand formed into green bodies by CIP. After sintering at various temperatures, the specimens were examined for microstructural evolution. Large pores were located at the center and boundary regions of granules left in the green bodies; they were not removed by densification and resulted in large pores in the sintered body, possibly forming fracture origin in ceramics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 287: Symposium K – Silicon Nitride Ceramics–Scientific and Technological Advances , 1992 , 435
Copyright
Copyright © Materials Research Society 1993

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References

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