SURFACE-COATED SINTERED HARD ALLOY MEMBER FOR CUTTING TOOL

摘要

PURPOSE:To improve the cutting performance of a sintered hard alloy member consisting of a prescribed hard dispersed phase and a prescribed binding phase by forming a coating layer of crystalline aluminum oxycarbonitride on the surface of the member. CONSTITUTION:A coating layer of crystalline aluminum oxycarbonitride is formed on the surface of a sintered hard alloy member consisting of a hard dispersed phase and a binding phase to obtain the titled member. The hard dispersed phase consists essentially of one or more kinds of compounds selected among the carbides, nitrides and carbonitrides of the IVa, Va and VIa group metals in the periodic table. The binding phase consists essentially of one or more kinds of iron group metals or the metals and one or more kinds of metals selected among the Cr group metals and Al. The titled member has superior cutting performance.