Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1981-02-03
1983-08-23
Bell, Mark
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
419 19, 419 48, C22C 2900, C22C 105, C22C 1903, C22C 1908
Patent
active
044002130
ABSTRACT:
Novel very hard compositions of matter are prepared by using in all embodiments only a minor amount of a particular carbide (or materials which can form the carbide in situ when subjected to heat and pressure); and no strategic cobalt is needed. Under a particular range of conditions, densified compositions of matter of the invention are prepared having hardnesses on the Rockwell A test substantially equal to the hardness of pure tungsten carbide and to two of the hardest commercial cobalt-bonded tungsten carbides. Alternately, other compositions of the invention which have slightly lower hardnesses than those described above in one embodiment also possess the advantage of requiring no tungsten and in another embodiment possess the advantage of having a good fracture toughness value. Photomicrographs show that the shapes of the grains of the alloy mixture with which the minor amount of carbide (or carbide-formers) is mixed are radically altered from large, rounded to small, very angular by the addition of the carbide. Superiority of one of these hard compositions of matter over cobalt-bonded tungsten carbide for ultra-high pressure anvil applications was demonstrated.
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Schwarzkopf, et al.; "Cemented Carbides", The Macmillan Company, New York, (1960), pp. 188-215 and 229-231.
"Properties and Proven Uses of Kennametal Hard Carbide Alloys", Brochure of Kennametal, Inc. pp. 1-23.
"Fractometer.RTM. System Specifications", Resource Enterprises, Salt Lake City, Utah.
Barker, L. M.; "A Simplified Method for Measuring Plane Strain Fracture Toughness", Engineering Fracture Mechanics, 1977, vol. 9, pp. 361-369.
Bell Mark
Besha Richard G.
Gaetjens Paul D.
Slade Elizabeth O.
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