Method of producing nanocrystalline alloy having high permeabili

Details Method of producing nanocrystalline alloy having high permeabili Method of producing nanocrystalline alloy having high permeabili

1995-07-19

1997-03-18

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148121, C21D 104

Patent

active

056118716

ABSTRACT:
A method for producing a nanocrystalline alloy wherein an amorphous alloy is heat-treated by keeping the temperature at a first heat treatment temperature higher than the crystallization temperature of the amorphous alloy for 0 to less than 5 minutes, and is cooled to room temperature at a cooling rate of 20.degree. C./min or more at least until the temperature falls to 400.degree. C. The amorphous alloy subjected to the first heat treatment may be further heat-treated at a second heat treatment temperature not higher than 500.degree. C. and lower than the first heat treatment temperature while applying a magnetic field. The nanocrystalline alloy produced by the method of the invention has a extremely high specific initial permeability as compared with the conventional nanocrystalline alloy, and is suitable for use in magnetic core of transformers, choke coils, etc.

REFERENCES:
patent: 4881989 (1989-11-01), Yoshizawa et al.
patent: 5255144 (1993-10-01), Martis
patent: 5439534 (1995-08-01), Takeuchi et al.

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