Patent ID: 8043533

Claim:
A boron-doped diamond sintered compact comprising: a quantity in the range of from 90 to 99.9 weight % of a boron-doped diamond powder in which the range of from 1 to 10 wt-% of boron component is doped, and a quantity in the range of from 0.1 to 10 wt-% of an alkaline earth metal carbonate powder acting as a bonding phase component in this sintered compact, comprising: one or more carbonates including alkaline earth metal elements Mg (magnesium), Ca (calcium), Sr (strontium) or Ba (barium); and/or one of more composite carbonates including two or more of the alkaline earth metal elements; wherein the boron-doped diamond powder and the alkaline earth metal carbonate powder are sintered together under HP/HT conditions at a pressure from 6.0 to 9.0 GPa and a temperature is from 1600 to 2500° C.; and wherein the bonding phase component melts and fills space between the boron-doped diamond powder particles.