Cemented hard metal
AssigneeSandvik Aktiebolag
InventorsNils A. Ingelstrom, Leif A. E. Akesson
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Abstract
An improvement in a cemented hard metal is disclosed. A molybdenum-tungsten-carbonitride is disclosed having the structure of tungsten carbide wherein the molybdenum and/or tungsten are at least partly substituted for by a metal selected from the group consisting of Cr, Nb, Ta, V, Re and mixtures thereof. The carbonitride may be mixed with a binder metal and sintered in a conventional manner to form a dense, substantially pore-free material.
Claims10
A cemented hard metal comprising one or more hard materials in an amount of 70 to 97 percent by weight and a binder alloy of iron group metals in amounts of 3 to 30 percent by weight, the hard materials consisting of at least 20 percent by weight of a molybdenum-tungsten-carbonitride having the structure of tungsten carbide WC with the molybdenum and/or tungsten being at least partly substituted for by a metal selected from the group consisting of Cr, Nb, Ta, V, Re and mixtures thereof.
A carbonitride having the composition (M.sub.x Mo.sub.y W.sub.z) (C,N) wherein M is selected from the group consisting of Cr, Nb, Ta, V, Re and mixtures thereof and in which
- x=>0 and up to 0.3
- y=0.0-0.95
- z=0.05-0.95
- and x+y+z=1.
In a method of making a molybdenum-tungsten-carbonitride having the structure of tungsten carbide WC wherein molybdenum, tungsten, and carbon in proportions sufficient for formation of the monocarbide, are heated in a nitrogen-containing atmosphere at a temperature sufficient to form the said molybdenum-tungsten carbonitride, the improvement comprising:
- substituting at least one metal M selected from the group consisting of Cr, Nb, Ta, Va, Re and mixtures thereof at least partly for the molybdenum and/or tungsten so as to form a carbonitride having the composition (M.sub.x Mo.sub.y W.sub.z) (C,N) in which
- x=>0 and up to 0.3
- y=0.0-0.95
- z=0.05-0.95
- and x+y+z=1.
Dependencies are inferred from the claim text.