Very thin soft magnetic Fe-based alloy strip and magnetic core a

Details Very thin soft magnetic Fe-based alloy strip and magnetic core a Very thin soft magnetic Fe-based alloy strip and magnetic core a

1991-12-11

1993-03-30

Wyszomierski, George

Metal treatment

Stock

Magnetic

148306, 148307, 420 89, 420 93, H01F 1147

Patent

active

051980401

ABSTRACT:
In the production by the single-roll technique of a thin amorphous strip as the matrix for the manufacture of a thin Co-based amorphous alloy strip or a thin Fe-based microcrystalline alloy strip, the conditions for the production are controlled to those specified by the invention. The production conditions thus controlled concern the atmosphere and the pressure to be used for ejecting a molten metal onto a rotating cooling member, the shape of a nozzle, the distance between the nozzle and the rotary cooling member, the material for the rotary cooling member and peripheral speed of the rotary cooling member, etc. The individual numerical values of these conditions are severally important. The thin strip which has an extremely small thickness and few pinholes thus is obtained. In the thin Co-based amorphous alloy strip, the extreme decrease of thickness to below 4.8 .mu.m notably enhances the soft magnetic properties such as permeability and core loss in the high frequency range. In the thin Fe-based microcrystalline alloy strip, the extreme decrease of thickness not more than 10 .mu.m permits improvement of resistance to embrittlement in addition to the improvement in the soft magnetic properties.

REFERENCES:
patent: 4420348 (1983-12-01), Shiiki et al.
patent: 4473400 (1984-09-01), Hoselitz
patent: 4581080 (1986-04-01), Meguro et al.
patent: 4881989 (1989-11-01), Yoshizawa et al.
patent: 4985088 (1991-01-01), Okamura et al.
patent: 5011553 (1991-04-01), Ramanan

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