Very high pressure sintering of cBN fine particles coated with TiN{endash}TiB{sub 2} layer formed by disproportionation reaction in molten salts

Journal Article · Sat Mar 01 04:00:00 EST 1997 · Journal of Materials Research

DOI:https://doi.org/10.1557/JMR.1997.0084· OSTI ID:490176

Yoshida, H ^[1]; Kume, S ^[2]

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1. National Institute for Advanced Interdisciplinary Research (NAIR), Tsukuba, Ibaraki 305 (Japan)
2. 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, Journal Name: Journal of Materials Research Journal Issue: 3 Vol. 12; ISSN JMREEE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON NITRIDES
COATINGS
MICROHARDNESS
SINTERING
TEMPERATURE RANGE 1000-4000 K
TITANIUM BORIDES
TITANIUM NITRIDES
VERY HIGH PRESSURE
VICKERS HARDNESS