Co-crystallization of filamentous and globular carbon on diamond and cBN during production of composite abrasive thermostable powders intended for grinding tools

Abstract

The features of co-crystallization of filamentous and globular carbon in a mixture of powders of superhard materials (micron powder of cubic boron nitride, grinding powder of synthetic diamond), leading to the formation of composite abrasive material under conditions of physical-chemical gas-phase synthesis at a pressure below atmospheric, are studied. It has been established that during the formation of a carbon binder from carbon-containing gas (methane) on the surface of  diamond and cubic boron nitride particles, successive formation of filamentous and  globular carbon structures linking the particles of superhard materials occurs. The possibility of modifying the produced composite powders by heat-resistant coatings based on inorganic substances (oxides and chlorides of metals and non-metals) is shown.