Patent ID: 9643892
Date: 2017-05-09
CPC Classifications: C04B

Claim:
1. PCBN material consisting of cBN grains dispersed in a matrix, the content of the cBN grains being in the range of 35 to 70 volume percent of the PCBN material; the matrix comprising at least one kind of chemical compound that includes aluminium (Al) and at least one kind of chemical compound that includes titanium (Ti); a plurality of cBN grain surfaces being coterminous with a substantially planar surface of the PCBN material; in which the size distribution of the cBN grains is such that at least 50 percent of the total equivalent circle area (ECA) arises from cBN intercept lengths up to 5 microns; and at least 20 percent of the total ECA arises from cBN intercept lengths greater than 5 microns.