Process of producing semi-hard magnetic materials

Details Process of producing semi-hard magnetic materials Process of producing semi-hard magnetic materials

1975-07-03

1976-11-02

Satterfield, Walter R.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 3155, 148121, 75170, H01F 100

Patent

active

039895572

ABSTRACT:
Semi-hard magnetic materials exhibiting an excellent square hysteresis loop are prepared by the following steps. An alloy material consisting essentially, by weight, of 73-93% Co, 1-5%Nb and the balance Fe is subjected to process annealing at not lower than 900.degree. C and cold working at a reduction of area of not less than 75% and then is subjected to any combination treatment involving one or more stress relief annealings at a temperature in the range 500.degree.-700.degree. C for a short period of time such that no intermetallic compound precipitates in said alloy followed by cooling to the ambient temperature, and one or more ageing treatments of said cooled material at a temperature in the range 600.degree.-900.degree. C for a considerably longer time such that an intermetallic compound does precipitate in said alloy.

REFERENCES:
patent: 3390443 (1968-07-01), Gould et al.
patent: 3600162 (1971-08-01), Kaplan et al.
patent: 3617260 (1971-11-01), Detert

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