Permanent-magnetic material
US4734131A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1987 |
| Grant date | Mar 29, 1988 |
| Priority date | — |
| Expiry date | Jul 21, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/057
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent-magnet material having a composition represented by the following formula; EQU R(Co.sub.1-X-Y-.alpha.-.beta. Fe.sub.X Cu.sub.Y M.sub..alpha. M'.sub.62)A (wherein X, Y, .alpha., .beta., and A respectively represent the following numbers: EQU 0.01.ltoreq.X, 0.02.ltoreq.Y.ltoreq.0.25, 0.001.ltoreq..alpha..ltoreq.0.15, EQU 0.0001.ltoreq..beta..ltoreq.0.001, and 6.0.ltoreq.A.ltoreq.8.3, providing that the amount of Fe to be added should be less than 15% by weight, based on the total amount of the composition, and R, M, and M' respectively represent the following constituents: PA0 R: At least one element selected from the group of rare earth elements, PA0 M: At least one element selected from the group consisting of Ti, Zr, Hf, Nb, V, and Ta, and PA0 M': B or B+Si), is disclosed. The permanent-magnetic material of the present invention is consisting of an intermetallic compound, permitting coexistence of liquid and solid phases in a wide region, and enabling sintering conditions warranting impartation of highly desirable magnetic characteristics to be selected in wide ranges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.