DIAMOND COMPACT

摘要

A compact composed of 70 to 95 diamond or cubic boron nitride (or other superhard materials) and which is free of conventional binders, catalysts, and/or solvents and has a thermal conductivity of at least 800 watts/m DEG K is prepared by subjecting a body (5) consisting essentially of particulate diamond or other superhard materials (6) to a HPHT (High Pressure/High Temperature) step, in which the pressure applied to the body is substantially uniform. The diamond compact is then subjected to Chemical Vapor Deposition (CVD) of the same or different superhard material to infiltrate the interstices of the HPHT compact. The CVD coating can have up to about 2,000 watts/m DEG K. The compact after both the HPHT and CVD steps substantially retains the thermal and chemical properties of the superhard materials from which it is made.