Structural and Phase Transformations in Boron Nitride during Attritor Treatment
V. T. Senyut, S. A. Kovaleva, E. I. Mosunov, A. A. Stefanovich
Keywords: graphite-like (hexagonal) boron nitride, mechanical activation, boron nitride, attritor, cubic boron nitride, phase transformations, amorphization
Pages: 647-652
Abstract
The features of phase and structural transformations in the powder of graphite-like boron nitride occurring as a result of the treatment in attritor are considered. It is established that attritor treatment causes an increase in the specific surface of boron nitride particles by more than an order of magnitude. An increase in the time of mechanical activation of the powder causes the transformation of the substructure of BN from the crystal to nanocrystalline and amorphous. It is shown that phase transformations with the formation of rhombohedral BN and high-pressure phases - wurtzite and cubic BN - with the particle size of submicrometer range proceed in boron nitride. When the optimal intensity and duration of treatment are exceeded, reverse transfer of cubic boron nitride into graphite-like (hexagonal) boron nitride with recrystallization of the latter is observed.
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