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US 4,035,541 AGranted
Sintered cemented carbide body coated with three layers
AssigneeKennametal Inc.
InventorsEmlyn N. Smith, Louis F. Pochet
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Abstract
A triple coated cemented hard metal carbide product in which a cemented metal carbide substrate is coated with, first, a metal carbide coating, in such a manner so as to create a carbon deficient area in the substrate, then, a metal carbo-nitride and, finally, a metal nitride coating so as to take advantage of the metal carbide and metal nitride properties in order to protect the cemented metal carbide substrate from corrosive atmospheres and abrasion due to frictional wear.
Claims9
A coated cemented carbide product comprising:
- a sintered cemented metal carbide substrate;
- a first coating firmly and adherently bonded to said substrate and an eta phase in said substrate immediately beneath said first coating, said first coating comprising a carbide of a metal selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium and tantalum;
- a second coating bonded onto said first coating and comprising a carbo-nitride of said selected metal;
- a third coating bonded on said second coating and comprising a nitride of said selected metal.
1 more element
Dependencies are inferred from the claim text.