Special features of the compaction and phase transformations of wurtzitic boron nitride nanopowders under the action of high static pressures and temperatures

Abstract

The experimental results of special features of the compaction and attendant phase transformations of compacts formed in sintering wurtzitic boron nitride nanopowders at high static pressures (p = 7.7 GPa) and temperatures (T = 1100–1800°C) have been considered. The principal possibility to produce polycrystalline superhard materials with nanocrystalline granular structures based on wurtzitic boron nitride has been established. The compaction of nanodispersed wurtzitic boron nitride at high barothermal conditions has been found to correspond to common regularities of the compaction of dispersed powder systems with regard to the effect of the phase and structural transformations.