Surface-modified, WC-based cemented carbide member, hard-coated, WC-based cemented carbide member, and their production methods

摘要

The ion bombardment of Cr, etc. onto a surface of a WC-based cemented carbide substrate in a nitrogen-based gas forms a modified phase having a bcc structure on the substrate surface, and a hard coating containing at least Cr formed thereon has high adhesion to the substrate by the modified phase.

主权项

1. A hard-coated, WC-based cemented carbide member comprising a hard coating containing at least Cr, which is formed on a WC-based cemented carbide substrate via a modified phase having a bcc structure, said modified phase having a metal composition represented except for inevitable impurities by the following general formula:
W100-x-yMxCoy(% by mass), wherein M is at least one element selected from the group consisting of Cr, V, Ni, Fe and Mn, Cr being indispensable and occupying 70% or more by mass of the entire element M, and (100-x-y), x and y expressing the amounts (% by mass) of W, said element M and Co are numbers meeting the conditions of 80≦100-x-y≦95, 5≦x≦20, and 0.1≦y≦3, respectively.