Process for manufacturing a magnetic core made of a nanocrystall

Details Process for manufacturing a magnetic core made of a nanocrystall Process for manufacturing a magnetic core made of a nanocrystall

1997-10-27

1999-07-13

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148121, H01F 1147

Patent

active

059221437

ABSTRACT:
Process for manufacturing at least one magnetic core made of an iron-based soft magnetic alloy having a nanocrystalline structure, wherein an amorphous ribbon is manufactured from the magnetic alloy, the annealing temperature Tm which, in the case of the ribbon, leads to maximum magnetic permeability, is determined, at least one core blank is manufactured from the ribbon and at least one core blank is subjected to at least one annealing operation, said annealing being carried out at a temperature T of between Tm+10.degree. C. and Tm+50.degree. C. for a temperature hold time t of between 0.1 and 10 hours so as to cause nanocrystals to form.

REFERENCES:
patent: 5055144 (1991-10-01), Fish et al.
patent: 5611871 (1997-03-01), Yoshizawa et al.
patent: 5725686 (1998-03-01), Yoshizawa et al.
Patent Abstracts of Japan, vol. 017, No. 071 (E-1319), Feb. 12, 1993; JP 04 275411 A (Mitsu Petrochem Ind. Ltd.), Oct. 1, 1992.
Patent Abstracts of Japan, vol. 017, No., 071 (E-1319), Feb. 12, 1993, JP 04 275410 A (Mitsui Petrochem Ind. Ltd.), Oct. 1, 1992.
IEEE Translation Journal on Magnetics in Japan, vol. 9, No. 6, Nov. 1, 1994; pp. 39-46, "Permeability and Alpha-Fe Phase Precipitated in FE-SI-B-CU-NB Amorphous Alloys".

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