Patent ID: 8067323
Filing Date: 2011-11-29
Classification: B23B,C04B

Abstract:
1. A process for making a sintered compact with a cubic boron nitride (cBN) portion and a non cBN portion, which comprises: (A) preparing a mixture comprising: wherein the total aluminum content in the non cBN portion of the sintered compact exceeds about 30 weight; wherein the cBN has a grain size distribution that is at least bimodal having a coarse portion comprising about 40% to about 80% of the cBN and a fine portion comprising about 20 to about 60% of the cBN; wherein the coarse portion has an average grain size of about 5 to about 30 μm and the fine portion has an average grain size of about 0 to about 10 μm; and wherein the ratio of the average grain size of the coarse portion to the average grain size of the fine portion is about 3:1 or greater; and (B) subjecting the mixture to high pressure and high temperature (HP/HT) conditions to produce a sintered compact.