Titanium carbonitride coated cemented carbide and cutting insert

Details Titanium carbonitride coated cemented carbide and cutting insert Titanium carbonitride coated cemented carbide and cutting insert

1994-05-12

2000-05-02

Beck, Shrive

Coating processes

Coating by vapor, gas, or smoke

Carbon or carbide coating

427255, 4272551, 428698, 428699, C23C 1636, C23C 1656

Patent

active

060569999

ABSTRACT:
A process for forming a titanium carbonitride 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, and to diffuse tungsten into the carbonitride coating, such that the grain boundaries of the said carbonitride layer is strengthened by the presence of tungsten due to solid solution strengthening and/or grain boundary strengthening.

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patent: 5093151 (1992-03-01), Van Den Berg et al.
patent: 5665431 (1997-09-01), Narasimhan

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