Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Patent
1994-05-20
1996-01-09
Walsh, Donald P.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
419 37, 501 93, 75236, 75241, 75242, 264 63, C22C 3200, B22F 100
Patent
active
054826705
ABSTRACT:
This invention consists of two parts: "Cemented Carbide with Minimal Amount of Binder Metal", and "Nonmagnetic cemented Carbide".
The "Cemented Carbide with Minimal Amount of Binder Metal" is for cemented carbide bodies which are made from less than 2% binder metal powder and more than two kinds of metal carbide powder. Neither kind of carbide powder exceeds 98% of all the carbide powder used as raw material. The raw powder is to be prepared following a conventional powder metallurgy method--especially the conventional method of making cemented carbide--milling, cold pressing and non-high-pressure sintering. During the sintering process, metal carbide powder forms complicated solid solution carbides, and the small amount of binder which initially helped sintering is lost for the most part, if not entirely, during sintering.
The "Non-magnetic Cemented Carbide" is cemented carbides which have nickel-tungsten alloy as a binder metal. The process of manufacturing uses said conventional powder metallurgy. The purpose of this invention is to manufacture non-magnetic cemented carbide using more than two metal carbide powders and binder metal. More than one kind of metal carbides form solid solution carbide during the sintering process.
REFERENCES:
patent: 1973428 (1934-10-01), Comstock
patent: 3918138 (1975-11-01), Nemeth et al.
patent: 5273571 (1993-12-01), Mirchandani et al.
Chi Anthony R.
Walsh Donald P.
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