Patent ID: 9487856
Filing Date: 2016-11-08
CPC Classification: C23C,Y10T

Claim Text:
1. A composite structure, comprising a cemented carbide substrate, an interlayer disposed over said substrate and a contiguous diamond film disposed over said interlayer, wherein said cemented carbide substrate comprises a binder, and said interlayer comprises crystalline chromium nitride, the composite structure being characterized by at least one of: a thickness of said interlayer which is lower than 20 microns; a concentration of said binder in said interlayer which is lower than 0.5 percent by weight; a concentration of amorphous carbon in said interlayer which is lower than 0.5 percent by weight; and a co-adhesion of said diamond film to said interlayer and of said interlayer to said substrate, which is exhibited by a microhardness test at a load of at least 20 kg.