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Effects of AIN Additions and Atmosphere on the Synthesis of Cubic Boron Nitride
Author(s) -
HIRANO SHINICHI,
YAMAGUCHI TAKAYUKI,
NAKA SHIGEHARU
Publication year - 1981
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1981.tb15897.x
Subject(s) - boron nitride , materials science , tetrahedron , hexagonal crystal system , nitride , inert gas , hexagonal boron nitride , aluminium , boron , grain size , crystallography , chemical engineering , metallurgy , nanotechnology , chemistry , composite material , organic chemistry , graphene , layer (electronics) , engineering
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 7×10 9 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.