Abstract
WC-Ni cemented carbides tended to be cracked in vacuum presintering and also to have heterogeneous carbon distribution both in vacuum and H2 atmosphere presintering, compared with WC-Co cemented carbides. H2-CH4 atmosphere presintering of WC-(15, 18) mass%Ni was attempted to solve these problems. Carbon contents of presintered compacts were investigated as a function of CH4 concentration of (5.6-30)vol%CH4 and the distance from the surface (0-15mm).
Carbon contents of these two presintered compacts increased with the increase in CH, concentration, and homogeneous carbon contents were obtained in H2-(5.6-10)vol%CH4 atmosphere presintering.
