Coated cemented carbide elements and their manufacture

Details Coated cemented carbide elements and their manufacture Coated cemented carbide elements and their manufacture

1978-02-03

1979-07-24

Hoffman, James R.

Coating processes

Coating by vapor, gas, or smoke

Carbon or carbide coating

148 63, 427248A, 427248B, 427248C, 427248E, 427248J, B05D 136, B05D 310, B05D 714

Patent

active

041623380

ABSTRACT:
Cemented carbide elements with working faces bearing a thin multilayer or stratified coating of nonuniform composition of wear-resistant materials exhibit superior wear-resistance for improved performance and service life under severe service conditions as in the case of inserts for cutting tools and wire drawing dies. In one embodiment, an initial carbon-rich layer of titanium carbide or carbonitride coating material in direct contact with a cemented carbide part or insert underlies a middle or intermediate stratified transition zone made up of a series of parallel layers or strata of coating material wherein the content of carbon and nitrogen is not constant but varies with the stratum or location by depth in that zone with the material gradually changing to titanium compounds that are progressively lower in combined carbon content and richer in nitrogen than in the initial layer until the composition of the outermost stratum of the transition zone approximates that of the overlying surface layer of high nitrogen content (e.g., titanium nitride). The coating is formed by a gas deposition method wherein changes in the concentration of gaseous carbon and nitrogen compounds are used to control the formation of the various layers of different composition in the layered coating.

REFERENCES:
patent: 3642522 (1972-02-01), Gass et al.
patent: 3656995 (1972-04-01), Reedy
patent: 3684585 (1972-08-01), Stroup et al.
patent: 3771976 (1973-11-01), Wakefield

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