Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1993-07-16
1995-06-13
Mai, Ngoclan
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75240, 75242, 419 36, 419 38, C22C 2912, B22F 312
Patent
active
054238994
ABSTRACT:
A method for forming a sintered hard metal composite is provided in which unsintered nodules of a pre-blended hard metal powder of a first grade are uniformly dispersed into unsintered nodules of a pre-blended hard metal composite of a second grade. The pre-blended hard metal powders form a composite powder blend which is subsequently pressed and sintered to form the dispersion alloyed hard metal composite. A sufficient amount of pressing lubricant is provided to one of the pre-blended hard metal powders so that each of the hard metal powders shrinks at approximately the same rate relative to the application of pressure during the compacting process. The pressing lubricant is added to that hard metal powder which shrinks more during sintering. By providing uniform shrinkage of the constituent powder grades, migration of the binder from one constituent grade to the other constituent grade is minimized, thereby allowing the composite powder blend to achieve superior properties because each of the constituent grades maintains its own integrity. In addition, the uniform shrinkage of the constituent powders prevents irregular surface conditions of the "as sintered" surface.
REFERENCES:
patent: 2731711 (1956-01-01), Lucas
patent: 3451791 (1969-06-01), Meadows
patent: 3660050 (1972-05-01), Iler et al.
patent: 4013460 (1977-03-01), Brown et al.
patent: 4017480 (1977-04-01), Baum
patent: 4070184 (1978-01-01), Scheithauer, Jr. et al.
patent: 4101318 (1978-07-01), Rudy
patent: 4394170 (1983-07-01), Sawaoka et al.
patent: 4398952 (1983-08-01), Drake
patent: 4525178 (1985-06-01), Hall
patent: 4596693 (1986-06-01), Ishizuka et al.
patent: 4604106 (1986-08-01), Hall et al.
patent: 4608318 (1986-08-01), Makrides et al.
patent: 4670408 (1987-06-01), Petzow et al.
patent: 4719076 (1988-01-01), Geczy et al.
patent: 4872904 (1989-10-01), Dorfman
patent: 4956012 (1990-09-01), Jacobs et al.
patent: 5045277 (1991-09-01), Penkunas et al.
Article "Structure and Properties Of Dual Properties Carbide For Rock Drilling" by Aronsson, Hartzell and Akerman.
DIN 30 900 (Ed. Jul. 1982) "Terminologie der Pulvermetallurgie", p. 14 (No translation).
F. Eisenkolb "Fortschritte der Pulvermetallurgie", vol. II, Akademie-Vlg. Berlin, 1963, pp. 493-543 No translation.
Krall Jack
Olsson Anders
Dever Michael L.
Mai Ngoclan
Newcomer Products, Inc.
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