Titanium carbonitride coated stratified substrate

Details Titanium carbonitride coated stratified substrate Titanium carbonitride coated stratified substrate

C - Chemistry, Metallurgy

23

C

C23C 16/36 (2006.01) C23C 8/02 (2006.01) C23C 16/56 (2006.01) C23C 30/00 (2006.01) C23C 16/44 (2006.01)

Patent

CA 2077205

A process for forming a titanium carbonitride coated stratified cobalt enriched cemented carbide cutting insert, said cemented carbide is comprised of more than 70 percent by weight tungsten carbide and has a matrix binder comprising cobalt with a cobalt enriched stratified surface. The process comprises chemically vapor depositing a layer of titanium carbonitride on said cemented carbide substrate by heating gaseous reactants comprising titanium chloride, methane, hydrogen, and nitrogen with an optimum methane/nitrogen ratio, under suitable conditions to form a titanium carbonitride coated insert having an eta phase in the cemented carbide substrate adjacent said titanium carbonitride coating. The eta phase comprises chemical compounds consisting essentially of cobalt, tungsten and carbon, and the titanium carbonitride surface is contacted with a carburizing gas for a sufficient time and at a sufficient temperature to convert substantially all of said eta phase to elemental cobalt and tungsten carbide.

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