Process for producing Ni-Fe magnetic tape cores

Details Process for producing Ni-Fe magnetic tape cores Process for producing Ni-Fe magnetic tape cores

1979-04-04

1981-09-22

Rutledge, L. Dewayne

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 3155, 148 3157, 148103, C21D 104

Patent

active

042908272

ABSTRACT:
An alloy comprised of 45 to 53 wt. % Ni with the remainder iron, and including small amounts of deoxidizing and processing additives is worked into a 0.01 to 0.1 mm thick tape, wound to form a tape core and is then subjected to a final annealing for at least one hour at a temperature of at least 900.degree. C. and thereafter is subjected to a tempering in a magnetic cross-field (i.e., the magnetic lines of force are applied in the plane of the tape perpendicular to the rolling direction thereof). The process provides high impulse permeabilities at induction rises of 1T or larger within the so-processed tape cores. Particularly high impulse permeabilities are achieved in instances where an anisotropic structure with a privileged grain direction <001> in the rolling direction is generated in the tape material via heating and final deformation before winding into a tape core and via a final annealing after winding of the tape core. The so-produced tape cores are useful in various electrical applications, particularly in pulse transformers and thyristor choke coils.

REFERENCES:
patent: 2002696 (1935-05-01), Kelsall
patent: 2430464 (1947-11-01), Gould
patent: 2891883 (1959-06-01), Howe
patent: 3125472 (1964-03-01), Yamamoto et al.
patent: 3546031 (1970-12-01), Pfeifer et al.
patent: 3556876 (1971-01-01), Pfeifer et al.
Von Friedrich Pfeifer, Zeitschrift fur Metallkunde (Journal for _Metalography) vol. 57, (1966) pp. 240-244.
Von Kar Scheel, Zeitshrift fur Physich (Journal for Physics) vol. 94 (1935) pp. 504-522.
Bozorth, Ferromagnetism, D. Van Nostrand Co. Inc., New York, 1951, pp. 117-134, 175 and 868-869.
Magnetism and Metallurgy vol. 2, Academic Press, New York, 1969, pp. 577-580.

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