Sintered cobalt-rare earth intermetallic product
A process is described for preparing novel sintered cobalt--rare earth intermetallic products which can be magnetized to form permanent magnets having stable improved magnetic properties. A cobalt--rare earth metal alloy is formed having a composition which at sintering temperature falls outside the composition covered by the single Co$sub 5$R intermetallic phase on the rare earth richer side. The alloy contains a major amount of the Co$sub 5$R intermetallic phase and a second solid CoR phase which is richer in rare earth metal content than the Co$sub 5$R phase. The specific cobalt and rare earth metal content of the alloy is substantially the same as that desired in the sintered product. The alloy, in particulate form, is pressed into compacts and sintered to the desired density. The sintered product is comprised of a major amount of the Co$sub 5$R solid intermetallic phase and up to about 35 percent of the product of the second solid CoR intermetallic phase which is richer in rare earth metal content than the Co$sub 5$R phase. (Official Gazette)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-33-012591
- Assignee:
- to General Electric Co.
- Patent Number(s):
- US 3919002
- OSTI ID:
- 4141858
- Resource Relation:
- Patent File Date: 1974 Feb 11; Other Information: H01f1/04. Orig. Receipt Date: 30-JUN-76
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Ceramics
& Other Materials-Metals & Alloys-Preparation & Fabrication
N50230 -Metals
Ceramics
& Other Materials-Metals & Alloys-Properties
Structure & Phase Studies
360101* -Materials-Metals & Alloys-Preparation & Fabrication
*COBALT ALLOYS- MAGNETIC PROPERTIES
*PERMANENT MAGNETS- FABRICATION
*RARE EARTH ALLOYS- MAGNETIC PROPERTIES
INTERMETALLIC COMPOUNDS
STABILITY