POLYCRYSTALLINE DIAMOND

摘要

A PCD composite compact comprising a PCD structure bonded at an interface to a substrate comprising cemented carbide material; the PCD structure comprising a mass of directly inter-bonded diamond grains having a mean size of at most about 4 microns, and the PCD structure comprising at least about 0.05 weight percent refractory metal or carbide of a refractory metal selected from the group comprising W, Ti, V, Cr, Zr, Nb, Mo, Hf and Ta; and at least the cemented carbide material proximate the interface having a content of metallic binder material of at most about 6 weight percent.