Sintered Fe-Cr-Co type magnetic alloy and method for producing article made thereof
US4601876A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1984 |
| Grant date | Jul 22, 1986 |
| Priority date | — |
| Expiry date | Aug 13, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C33/0285
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.