Diamond-coated hard metal member

摘要

A diamond-coated hard metal member comprising a WC-based hard metal substrate having a roughened surface formed by electrolytic etching and a diamond coat layer coating the roughened surface with an interlayer provided interposed therebetween. The interlayer coats the substrate, and is a W layer having a roughened surface corresponding to the roughened surface of the substrate. The unetched substrate comprises disperse phases dispersed therein in an amount of from 2 to 5 mol-%, and has disperse phases having an average longest diameter of from not less than 0.5 mum to less than 2 mum on the surface thereof in a density of from not less than 0.1/mum2 to not more than 0.2/mum2.