THE EFFECT OF MODIFICATION OF THE SURFACE OF DIAMOND NANOPOWDER PARTICLES WITH C–W BONDS ON THE HIGH-PRESSURE SINTERING OF A DIAMOND – TUNGSTEN CARBIDE NANOCOMPOSITE

Abstract

The effect of modification of the surface of diamond nanopowder particles with С–W bonds on the sintering in the high-pressure apparatus "Toroid 20" of a diamond-tungsten carbide nanocomposite from a mixture with tungsten trioxide of statically synthesized diamond nanopowder ASM5 0.1/0 was studied. Preparation for sintering consisted in cleaning the diamond nanopowder from solvent metal and non-diamond carbon residues, forming the mixture, heating it in a vacuum to form С–W bonds with subsequent annealing in a hydrogen atmosphere, pressing the compacts and annealing them in a vacuum before sintering. It is shown that sintering intensifies - the degree of densification of diamond nanopowder increases as a result of surface modification with carbon–tungsten bonds in combination with degassing before sintering and the reactive interaction of diamond with tungsten