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Sintering of cubic boron nitride without additives at 7.7 GPa and above 2000 °C

Published online by Cambridge University Press:  26 July 2012

Takashi Taniguchi ,
Minoru Akaishi  and
Shinobu Yamaoka
Takashi Taniguchi
Affiliation:
National Institute for Research in Inorganic Materials, 1-1 Namiki Tsukuba, Ibaraki 305, Japan
Minoru Akaishi
Affiliation:
National Institute for Research in Inorganic Materials, 1-1 Namiki Tsukuba, Ibaraki 305, Japan
Shinobu Yamaoka
Affiliation:
National Institute for Research in Inorganic Materials, 1-1 Namiki Tsukuba, Ibaraki 305, Japan
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Extract

The sintering behavior of cBN powder with various particle sizes from 0.5 to 12 µm was investigated when sintered at temperatures from 1500 to 2500 °C and pressure of 7.7 GPa without additives. Above 2000 °C, translucent sintered bodies were obtained. Microstructure observation indicated that the optimum sintering temperature was near 2350 °C for fine powders of 0.5 to 1.2 µm and 2 to 4 µm, and slightly higher than 2350 °C for powders from 8 to 12 µm. The fracture toughness of the well-sintered bodies decreased with grain growth above the optimum sintering temperature.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 1 , January 1999 , pp. 162 - 169
Copyright
Copyright © Materials Research Society 1999

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