Ni-Fe-Al Material having high magnetic permeability

Details Ni-Fe-Al Material having high magnetic permeability Ni-Fe-Al Material having high magnetic permeability

1975-03-04

1976-08-03

Satterfield, Walter R.

Metal treatment

Compositions

Heat treating

75170, 75171, 148 3157, 148121, C04B 3500

Patent

active

039727459

ABSTRACT:
By the inclusion, by weight, of 1-5% of aluminium, as the essential additive, in a 78 permalloy (an Fe-Ni alloy) having a basic composition comprising the two essential elements, i.e. 75-82% of nickel and 5-24% of iron, the hardness of this alloy is improved without deteriorating the magnetic characteristic including magnetic permeability of the alloy. Furthermore, molybdenum, copper, chromium, and niobium may be added together with the aluminum in a suitable combination and amount to enhance both the hardness and characteristic of the alloy, facilitating the heat treatment during the manufacture of the material of this invention. This improved material or alloy is obtained in a relatively simple procedure and is of a good workability and is suitable for use as the material of head cores of magnetic recording apparatuses.

REFERENCES:
patent: 1910309 (1933-05-01), Smith et al.
patent: 3743550 (1973-07-01), Masumoto et al.
Bozorth, R.; Ferromagnetism; New York, 1951, pp. 184-185 and 385-388.

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