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Orientation-dependent properties of silicon nitride with aligned reinforcing grains

Published online by Cambridge University Press:  31 January 2011

Dong-Soo Park ,
Myoung-Je Choi ,
Tae-Wook Roh ,
Hai-Doo Kim  and
Byung-Dong Han
Dong-Soo Park
Affiliation:
Ceramic Materials Group, Korea Institute of Machinery and Materials, 66 Sang-Nam-Dong, Chang-Won City, Kyong-Nam, South Korea
Myoung-Je Choi
Affiliation:
Ceramic Materials Group, Korea Institute of Machinery and Materials, 66 Sang-Nam-Dong, Chang-Won City, Kyong-Nam, South Korea
Tae-Wook Roh
Affiliation:
Ceramic Materials Group, Korea Institute of Machinery and Materials, 66 Sang-Nam-Dong, Chang-Won City, Kyong-Nam, South Korea
Hai-Doo Kim
Affiliation:
Ceramic Materials Group, Korea Institute of Machinery and Materials, 66 Sang-Nam-Dong, Chang-Won City, Kyong-Nam, South Korea
Byung-Dong Han
Affiliation:
Ceramic Materials Group, Korea Institute of Machinery and Materials, 66 Sang-Nam-Dong, Chang-Won City, Kyong-Nam, South Korea
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Extract

Silicon nitride with the aligned reinforcing grains was prepared by tape casting with addition of the silicon nitride whiskers and gas-pressure sintering at 2148 K. The microstructure and the mechanical properties of the sintered sample, including the fracture toughness and the three-point flexural strength, were highly anisotropic. Both the fracture toughness and the flexural strength were the highest when the crack-propagation direction was normal to the alignment direction. This result was interpreted from the laminate composite materials’ point of view. Although the large elongated grains were as long as 44.4 ± 12 μm and as wide as 5.1 ± 0.67 μm, they were not the fracture origins.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 1 , January 2000 , pp. 130 - 135
Copyright
Copyright © Materials Research Society 2000

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