Very high pressure sintering of cBN fine particles coated with TiN{endash}TiB{sub 2} layer formed by disproportionation reaction in molten salts
- National Institute for Advanced Interdisciplinary Research (NAIR), Tsukuba, Ibaraki 305 (Japan)
- National Industrial Research Institute of Nagoya (NIRIN), 1-1 Hirate-cho, Kita-ku, Nagoya, 462 (Japan)
Sintering of a fine cubic boron nitride (cBN) particle with a grain size of less than 2 {mu}m was successfully carried out under 5.5 GPa pressure at 1720 K for 30 min. TiN{endash}TiB{sub 2}-coated cBN particles were used as the starting powder without adding any other binding materials. The coating was carried out by dipping the cBN particles in molten salts. The obtained cBN sintered compact shows a smooth microstructure with a well-controlled grain boundary; TiN{endash}TiB{sub 2} is distributed over the cBN-grain boundary in the shape of a net mesh similar to tiled floors. The Vickers microhardness of the obtained compact was found to be higher than that of commercially available typical cBN-cutting tools. {copyright} {ital 1997 Materials Research Society.}
- OSTI ID:
- 490176
- Journal Information:
- Journal of Materials Research, Vol. 12, Issue 3; Other Information: PBD: Mar 1997
- Country of Publication:
- United States
- Language:
- English
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