Patent ID: 6706327
Filing Date: 2004-03-16
Classification: C22C,C23C,Y10T

Abstract:
A method of making a coated cemented carbide body, the body comprising a cemented carbide of WC with an average grain size of 0.5-4 &mgr;m, 3.5-9 wt-% Co and <2 wt-% carbides of Ta, Ti and Nb and with a substoichiometric carbon content, the method comprising: sintering the body such that an eta phase containing structure is obtained with a size of 1-15 &mgr;m and a content of 10 vol-% to 35 vol-%, and subjecting the cemented carbide body to recarburisation such that the eta phase in a 50-350 &mgr;m wide intermediate zone is transformed to WC+Co without essentially changing its Co-content.