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

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Abstract

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.

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  1. National Institute for Research in Inorganic Materials, 1-1 Namiki Tsukuba, 305, Ibaraki, Japan

    Takashi Taniguchi, Minoru Akaishi & Shinobu Yamaoka

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  1. Takashi Taniguchi
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  2. Minoru Akaishi
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  3. Shinobu Yamaoka
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Taniguchi, T., Akaishi, M. & Yamaoka, S. Sintering of cubic boron nitride without additives at 7.7 GPa and above 2000 °C. Journal of Materials Research 14, 162–169 (1999). https://doi.org/10.1557/JMR.1999.0024

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  • DOI: https://doi.org/10.1557/JMR.1999.0024

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