Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder shape or size characteristics
Patent
1984-08-13
1986-07-22
Sheehan, John P.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder shape or size characteristics
148104, 148 3157, 419 25, 419 38, 419 46, 419 63, C22C 3200
Patent
active
046018760
ABSTRACT:
A sintered Fe-Cr-Co type magnetic alloy consisting essentially of 20-35% Cr, 3-15% Co and the balance substantially of Fe and a method of producing an article made of the alloy are disclosed. The method comprises the steps of blending at least one of an Fe-Cr powder and Fe-Cr-Co powder with a carbonyl Fe-powder and a Co-powder, if necessary to make up to said alloy composition, to provide a powder blend, the average particle size of said Fe-Cr powder and Fe-Cr-Co powder being 200 mesh or smaller in size, and the surface of these powders having been activated; compacting the resulting powder blend to provide a compact; sintering the resulting compact in an atmosphere in which the total amount of oxygen and nitrogen has been restricted to not more than 3 ppm; and effecting the heat treatment and magnetization of the resulting sintered alloy.
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patent: 4401482 (1983-08-01), Green et al.
Fujimura Setsuo
Yamashita Michio
Sheehan John P.
Sumitomo Special Metals Co. Ltd.
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