Permanent magnet and process for making same

Details Permanent magnet and process for making same Permanent magnet and process for making same

1981-02-20

1982-12-28

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148103, 148104, 148108, H01F 102

Patent

active

043660070

ABSTRACT:
A method of making a hard or semihard magnetic alloy which involves initially forming a body of a spinodally decomposable alloy composition of iron-chromium-cobalt base by casting an admixture of 3 to 30% by weight cobalt, 10 to 40% by weight chromium, 0.1 to 15% by weight vanadium and the balance iron. The body is then solution treated at an elevated temperature and for a period sufficient to produce a homogeneous single .alpha.-phase structure in the body and the solution-treated body is tempered at a reduced temperature and for a time period sufficient to spinodally decompose therein the single .alpha.-phase structure into a composition-modulated, phase-separated structure consisting of an .alpha..sub.1 phase which is magnetic and an .alpha..sub.2 phase which is nonmagnetic, said phase-separated structure forming the magnetic alloy.

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patent: 4171978 (1979-10-01), Inoue
patent: 4174983 (1979-11-01), Chin et al.

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