Author： Onodera A. Matsumoto K. Hirai T. Goto T. Motoyama M. Yamada K. Kohzuki H.
Publisher： Springer Publishing Company
ISSN： 0022-2461
Source： Journal of Materials Science, Vol.36, Iss.3, 2001-02, pp. : 679-684
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Abstract
Composites made up of boron, carbon, and nitrogen were studied using a combination of chemical vapor deposition (CVD) and high pressure (HP) techniques. The CVD/HP process comprised deposition of C_x (BN)_1−x composites where x = 0.03 or 0.8, followed by heat treatment of the deposited samples under pressures from 6 to 10 GPa using an octahedral-anvil apparatus. Also a sample prepared by nitriding of boron and carbon to compose x = 0.5 was studied up to 16 GPa. A diamond-type solid solution was obtained after the C_0.8(BN)_0.2 sample was treated at 10 GPa and 1600°C or at 8 GPa and 1700°C whereas the C_0.03(BN)_0.97 and C_0.5(BN)_0.5 samples exhibited decomposition into carbon and BN under all the P, T conditions studied. Sintered compacts consisting primarily of the cubic BN and carrying hardness with a maximum value of 54 GPa were obtained from C_0.03(BN)_0.97.
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