Titanium carbonitride coated stratified substrate and cutting in

Details Titanium carbonitride coated stratified substrate and cutting in Titanium carbonitride coated stratified substrate and cutting in

1997-05-22

2000-06-27

Turner, Archene

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428212, 428457, 428469, 428472, 428697, 428698, B32B 900

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active

060804777

ABSTRACT:
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
itrogen 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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