Mechanisms for Formation of Highly Oriented Plate-Like Triangular Prismatic WC Grains in WC-Co Base Cemented Carbides Prepared from W and C Instead of WC
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概要
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We have developed an economical new fabrication process of WC-Co base cemented carbides with highly oriented plate-like triangular prismatic WC grains by using special W+C mixed powder instead of conventional WC powder, and already reported that the new alloy has superior room-temperature mechanical properties, compared with the conventional alloy.<BR>In this study, the mechanism of such WC grain formation was investigated in detail. It was clarified that the formation has its origin in both the flattening of W granular particles to plate-like shape by ball-milling and their highly unidirectional orientation by die-pressing, and is assisted by both the formation of highly unidirectional plate-like Co-W-C compounds (Co<SUB>x</SUB>W<SUB>y</SUB>C<SUB>z</SUB>) particles and its change to highly unidirectional plate-like triangular prismatic WC grains during solid state heating. Such formation of WC grains is attributed to both the higher nucleation and/or growth rate of WC grains having (0001) crystal plane parallel to the geometrical basal plane of plate-like Co<SUB>x</SUB>W<SUB>y</SUB>C<SUB>z</SUB> particles. Furthermore, the formation is also assisted by non-collapse of such WC grains configuration during the appearance and solidification of Co-W-C liquid phase.
- 社団法人 粉体粉末冶金協会の論文
- 2001-01-15
著者
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HAYASHI Koji
Institute of Industrial Science, The University of Tokyo
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Hayashi K
Institute Of Industrial Science The University Of Tokyo
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Kinoshita Satoshi
Toshiba Tungaloy Co. Ltd.
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KOBAYASHI Masaki
Toshiba Tungaloy Co., Ltd.
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SAITO Takeshi
Toshiba Tungaloy Co.,Ltd.
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Saito Takeshi
Toshiba Tungaloy Co. Ltd.
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Kobayashi Masaki
Toshiba Tungaloy Co. Ltd.
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Hayashi Koji
Institute Of Industrial Science
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