Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1982-09-23
1984-08-14
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148121, 148 3157, 75123R, 420581, H01F 102
Patent
active
044655266
ABSTRACT:
The disclosed permanent magnet consists of an iron-palladium alloy consisting of 25 to 40 atomic % of palladium, and the remainder of iron with less than 0.5 atomic % of impurities or an iron-palladium-silver alloy consisting of 19.5 atomic % of palladium, 0.1 to 27.5 atomic % of silver and the remainder of iron with less than 0.5 atomic % of impurities and having a crystalline structure with fine dispersion of .alpha.+.gamma..sub.1 phase in a matrix, so that the permanent magnet has a coercive force of higher than 500 Oe, a residual magnetic flux density of larger than 6 kG, and a maximum energy product of larger than 2 MG.Oe. The disclosed method of producing the aforementioned permanent magnet comprises steps of homogenizing solid solution treatment at a temperature depending on the specific alloy composition, cooling, and tempering at a suitable temperature so as to generate the aforementioned crystalline structure.
REFERENCES:
patent: 1832307 (1931-11-01), Kingsbury
patent: 2226079 (1940-12-01), Spanner
patent: 3155467 (1964-11-01), Yamamoto et al.
patent: 4098605 (1978-07-01), Nepela et al.
Kussman and Muller in "Zeitschrift fur angewandte physik" 1964, vol. 17 No. , pp. 509-511.
Sheehan John P.
The Foundation: The Research Institute of Electric and Magnetic
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