Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1980-04-22
1982-01-19
Rutledge, L. Dewayne
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148 3157, 148120, 148121, C21D 104
Patent
active
043115373
ABSTRACT:
In view of rising cobalt costs, low-cobalt alloys such as, e.g., Fe-Cr-Co alloys are finding increasing use in the manufacture of permanent magnets. Desired magnetic energy product of such magnets is typically at least 1 million gauss-oersted.
In the interest of maximizing magnetic energy product per unit weight cobalt, low-cobalt Fe-Cr-Co alloys are processed by solidifying a bulk object from a melt, annealing, quenching, and aging by cooling at rates in a range of 0.1 to 2 degrees C. per hour in a magnetic field. Cold working prior to aging may be used to further enhance magnetic energy product.
Resulting magnets have optimized maximum magnetic energy product (BH).sub.max per unit weight cobalt comprised in an alloy.
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Chin Gilbert Y.
Green Martin L.
Sherwood Richard C.
Wernick Jack H.
Bell Telephone Laboratories Incorporated
Businger Peter A.
Rutledge L. Dewayne
Sheehan John P.
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