EXCAVATION CHIP, EXCAVATION TOOL, AND METHOD FOR MANUFACTURING EXCAVATION CHIP

摘要

A drilling tip according to the disclosure has a tip body which is provided with a tip portion tapered toward a tip side of the tip body; and a hard layer which is formed on a surface of the tip portion of the tip body, an outermost layer of the hard layer is a cBN sintered material having 70 to 95 vol% of cBN grains, and when a cross-sectional structure of the outermost layer is observed, a binder phase having a width of 1nm or greater and 30nm or less and containing Al, B, and N, and in which a ratio of an O content to an Al content is 0.1 or less exists between neighboring cBN grains.