Cutting composite material based on nanopowders of aluminum oxide and tungsten monocarbide

Abstract

The articale investigated properties cutting tool material of ultrapowders Al2O3 - 50 wt. % WC which have got hot pressing method and the study of their properties. To obtain cutting inserts based on aluminum oxide and tungsten monocarbide with high functional capabilities, the phase components of the initial powders are selected and their homogenized during mixing, hot pressing with the selection of optimal sintering modes with the direct passage of a high-ampere current through a graphite mold. The sintering regime has a great influence on the final properties of the ceramic material. The optimum sintering temperature of ceramics depends on the dispersion of the original powder, the presence of impurities, additives and the duration of heating. It was found that in order to reduce fragility and obtain tool ceramics with high reliability, it is sometimes necessary to exclude even the smallest porosity caused by the ingress of dust from the air.