Effects of AIN Additions and Atmosphere on the Synthesis of Cubic Boron Nitride
- 1 December 1981
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 64 (12) , 734-736
- https://doi.org/10.1111/j.1151-2916.1981.tb15897.x
Abstract
Aluminum nitride was found to act as the catalyst for the synthesis of cubic BN by sealing the mixture of hexagonal BN and AIN in a pressure cell under the inert or reducing atmosphere. No conversion of hexagonal BN to cubic BN was observed under pressures below 7×109 Pa (7 GPa, 70 kbar) without AIN addition. All hexagonal BN could be completely converted to cubic BN under 6.5 GPa at 1600°C by the addition of 20 mol% AIN. The cubic BN thus synthesized was a typical tetrahedron (grain size ≅2 μm). The pressure‐temperature diagram for the synthesis of cubic BN was determined at >7 GPa and T<1700°C.Keywords
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