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Journal of Wide Bandgap Materials
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cBN->hBN Phase Transformation During Sintering of cBN and Al Powders at High Pressures and Temperatures

A. A. Shulzhenko

V.N. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine, Kyiv, 2 Avtozavodskaya Str., Kiev. 04074, Ukraine, ism1{at}kibonkiev.ua, alcon{at}ism.kiev.ua

M. P. Bezhenar

V.N. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine, Kyiv, 2 Avtozavodskaya Str., Kiev. 04074, Ukraine

S. A. Bozhko

V.N. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine, Kyiv, 2 Avtozavodskaya Str., Kiev. 04074, Ukraine

N. M. Belyavina

T.G. Shevchenko Kiev National University, Kyiv, Ukraine

V. Ya. Markiv

T.G. Shevchenko Kiev National University, Kyiv, Ukraine

The formation of a graphite-like hexagonal modification of boron nitride (hBN) in sintering powders of the cubic modification (cBN) have been studied in a multifactorial experiment in a toroid-type high-pressure apparatus. The cBN and hBN contents of as-sintered samples have been found by XRD analysis. Pressure and temperature affect the cBN-hBN phase transformation most of all. With increasing cBN powder dispersion, the peak in the cBN-hBN transformation curve shifts to the lower temperatures, while the addition of aluminum cause it to shift to the high temperatures.

Key Words: cubic boron nitride • crystallographic modification • phase transformation • high pressure • high temperature

Journal of Wide Bandgap Materials, Vol. 10, No. 1, 5-13 (2002)
DOI: 10.1177/152451102028019
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