Sintered carbonitride alloy with improved toughness behavior and method of producing same

Abstract

There is now provided a method of manufacturing a sintered body of titanium-based carbonitride alloy comprising hard constituents in 5-25% binder phase where the hard constituents contain, in addition to Ti, one or more of the metals V, Nb, Ta, Cr, Mo or W and the binder phase is based on cobalt and/or nickel by powder metallurgical methods, i.e., milling, pressing and sintering. The composition of the hard constituents is: 0.88<a<0.96; 0.04<b<0.08; 0.ltoreq.c<0.04; 0.ltoreq.d<0.04; 0.60<f<0.73; 0.80<x<0.90; and 0.31<h<0.40. and the overall composition of the hard constituents phase is expressed by the formula: (Ti.sub.a,Ta.sub.b,Nb.sub.c,V.sub.d).sub.x (Mo.sub.e,W.sub.f).sub.y (C.sub.g,N.sub.h).sub.z. Favorable properties are obtained if the alloy is made from a powder mixture comprising: 23-28% by weight Ti(C,N) with a nitrogen content between 9 and 13% by weight; 13-17% by weight (Ti,Ta)(C,N) with a Ti/Ta ratio of 80/20; 14-18% by weight (Ti,Ta)C with a Ti/Ta ratio of 50/50; 15-20% by weight WC; and 3-7% by weight Mo.sub.2 C provided that the total amount of said five powders is >78% by weight and <83% by weight.

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