Metal treatment – Compositions – Heat treating
Patent
1975-02-28
1977-02-08
Satterfield, Walter R.
Metal treatment
Compositions
Heat treating
75124, 148121, H01F 104
Patent
active
040070654
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 second stage heat treatment produce very stable magnetic properties with typical values of Br = 9,500, Hc = 230 and BH max = 1.2. These properties are extremely well suited to many hysteresis torque producing devices.
REFERENCES:
patent: 1818054 (1931-08-01), Elmen
patent: 1968569 (1934-07-01), Ruder
patent: 2207685 (1940-07-01), Russell et al.
patent: 2797161 (1957-06-01), Ireland et al.
patent: 3432369 (1969-03-01), Naastepad
patent: 3545525 (1970-12-01), Aldenkamp et al.
Handren Ralph M.
McKay John P.
Arnold Engineering Company
Dropkin Robert F.
Gioia Vincent G.
Satterfield Walter R.
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