Hysteresis alloy
US4007065A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1975 |
| Grant date | Feb 8, 1977 |
| Priority date | — |
| Expiry date | Feb 28, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to a novel alloy consisting essentially of 13-18% nickel, 7-11% aluminum, 0.5 to 10% cobalt, 0.1 to 2% silicon and the remainder substantially all iron, as is produced by heating the alloy composition to a temperature of about 1650.degree. C or above to form a melt and then casting the melt in a suitable mold. After solidification, the casting is heated to approximately 1150.degree. C, held at that temperature for a sufficient time to insure that the whole mass is heated uniformly, and then cooled at the rate of about 300.degree. C per minute. Parts are then given an aging for the purpose of producing uniform magnetic properties throughout the casting. Magnets thus cast, heat-treated and aged as aforesaid produce very stable magnetic properties with typical values of Br = 10,000, Hc = 150 and BH max = .85. A further improvement in properties can be achieved by a second stage heat treatment wherein castings are heated to about 900.degree. C, held at this temperature for a sufficient time to assure that the whole mass is heated uniformly, and then cooled to about 600.degree. C at the rate of 60.degree. C per minute, followed by aging. Parts thus treated with the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.