Magnetic cores

Details Magnetic cores Magnetic cores

1978-09-27

1981-06-23

Rutledge, L. Dewayne

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 3155, C21D 104

Patent

active

042748887

ABSTRACT:
The invention herein disclosed is directed to novel magnetic cores, particularly magnetic tape-wound cores, and to a new, novel and less expensive method of manufacture. The alloys employed in the manufacture of these cores employ smaller quantities of expensive metals such as nickel and, accordingly, result in substantial savings. The cores are exceptionally useful because of their high available flux-density change and high pulse permeability. Generally, the alloys employed contain nickel contents of from about 49 to 56 percent by weight of the alloy, and the remainder is substantially iron and small quantities of additives. The magnetic core is heat treated in a hydrogen atmosphere for several hours, cooled to room temperature, then reheated above the Curie Point and then cooled in a transverse magnetic field. Alternatively, it is possible to cool to just above the Curie Point, and omit the room temperature cooling and subsequent reheating.

REFERENCES:
patent: 1807021 (1931-05-01), Yensen
patent: 2002689 (1935-05-01), Bozorth et al.
patent: 2499860 (1950-03-01), Hansen
patent: 2558104 (1951-06-01), Scharschu
patent: 2569468 (1951-10-01), Gaugler
patent: 3440364 (1969-04-01), Parker
patent: 3844849 (1974-10-01), Kuroda
patent: 3989555 (1976-11-01), Yamagishi
Brochure M031-Vacuumschmelze GmbH.
Volk, Nickel and Nickel Alloys, Properties and Behavior, 1970, 5.324, "Alloys with Rectangular Loop or High Permeability due to Magnetic Field Tempering", pp. 93-98.
Metallwissenschaft und Technik, vol. 16, pp. 1185-1192.
Blatt fur Patent Muster-und Zeichenwesen, 1977, p. 36, sect. 33, paragraph (1) (2).
Jackson, Classical Electrodynamics, p. 620.

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