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Interface Structure of Si3N4 Matrix Composite with Nano-Meter Scale Sic Particles

Published online by Cambridge University Press:  25 February 2011

Gen Sasaki ,
Katsuaki Suganuma ,
Teruaki Fujita ,
Kenji Hiraga  and
Koichi Niihara
Gen Sasaki
Affiliation:
Research Center for Advanced Science and Technology, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo 153, Japan
Katsuaki Suganuma
Affiliation:
National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, 239, Japan
Teruaki Fujita
Affiliation:
National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, 239, Japan
Kenji Hiraga
Affiliation:
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai 980, Japan
Koichi Niihara
Affiliation:
Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki 567, Japan
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Abstract

²-Si3N4 matrix composites reinforced with nano-meter scale SiC particles were fabricated by hot-pressing the mixture of SiC and Si3N4 fine powders. Interface microstructure and crack propagation in the composite were observed by high resolution electron microscopy. The interface between SiC and Si3N4 had good coherence, but no preferred orientation was observed. At the interface between SiC and Si3N4, the (111) face of SiC particles was flat, and sometimes a disturbed lattice structure thinner than 1 nm was observed. Near the main cracks, the microcracking at fine SiC particles/Si3N4 matrix interface was frequently observed. The cracks propagated exactly along this interface. The interface microcracking seems to contribute to the improvement of fracture toughness.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 287: Symposium K – Silicon Nitride Ceramics–Scientific and Technological Advances , 1992 , 335
Copyright
Copyright © Materials Research Society 1993

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References

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