Cemented carbide body with a binder phase gradient and method of making the same
AssigneeSantrade Ltd.
InventorsUdo K. R. Fischer, Erik T. Hartzell, Jan G. H. Akerman
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Abstract
The present invention relates to a cemented carbide body, preferably for rock drilling, mineral cutting and wear parts, in which the content of binder phase in the surface is lower and in the center higher than the nominal content. In the center there is a zone having a uniform content of binder phase. The WC grain size is uniform throughout the body.
Claims11
Cemented carbide body comprising WC and a binder metal selected from the group consisting of cobalt, iron, nickel and alloys thereof, the grain size of the WC being uniform throughout the body, wherein the binder metal content in the surface is from 0.1 to 0.9 and the binder metal content in the center is at least 1.2, of the nominal binder of the cemented carbide body, said cemented carbide body being essentially free of eta phase carbide.
A method of making a cemented carbide body comprising (i) sintering a mixture of WC having a substoichiometric amount of carbon and a binder metal selected from the group consisting of cobalt, iron, nickel and alloys thereof to form a sintered body including WC, binder metal and eta phase carbide and then (ii) carburizing the sintered body sufficient to remove all eta phase thereby producing a carburized body having a lower binder metal content in the surface than in the center of the body.
Dependencies are inferred from the claim text.