PROVIDING A CATLYST FREE DIAMOND LAYER ON DRILLING CUTTERS

摘要

A method of making a polycrystalline diamond compact including providing a layer of graphene on top of a sintered PCD and transforming the graphene at high pressure and temperature into diamond that is free of metal catalyst. A method of making PCD by providing a layer of graphene powder (38) on top of a layer of diamond powder (36) and a substrate (20) and sintering at high pressure and temperature to transform the graphene into diamond that is free of metal catalyst at the surface. A cutting element for a tool comprisig a substrate, a PCD table and a diamond volume that is substantially free of catalytic material. The PCD is between the substrate and the diamond volume.