Platinum-cobalt alloy permanent magnets of enhanced coercivity
US4983230A · kind A · utility
8Cited by
2References
7Claims
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Key dates
| Filing date | Apr 11, 1989 |
| Grant date | Jan 8, 1991 |
| Priority date | — |
| Expiry date | Apr 11, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C5/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The coercivity of magnetic alloys formed from platinum, cobalt, and boron is enhanced by incorporating from 12 to 14 percent of boron together with amounts of platinum and cobalt such that the ratio of platinum to cobalt is from 0.90 to 1.2. The magnetic alloy is formed by rapid solidification of a homogeneous melt, and the solidified casting is heat treated to improve microstructure and increase coercivity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.