Metallic glasses having a combination of high permeability, low

Details Metallic glasses having a combination of high permeability, low Metallic glasses having a combination of high permeability, low

1990-12-06

1992-05-05

Sheehan, John P.

Metal treatment

Stock

Magnetic

420 64, 420 67, 420117, 420121, 420123, H01F 104

Patent

active

051103788

ABSTRACT:
Metallic glasses having high permeability, low coercivity, low ac core loss, low exciting power, and high thermal stability are disclosed. The metallic glasses are substantially completely glassy and consist essentially of about 71 to 79 atom percent iron, about 1 to 6 atom percent of at least one member selected from the group consisting of chromium, molybdenum, tungsten, vanadium, niobium, tantalum, titanium, zirconium and hafnium, about 12 to 24 atom percent boron, about 1 to 8 atom percent silicon, 0 to about 2 atom percent carbon, plus incidental impurities, the total of boron, silicon and carbon present ranging from about 18 to 28 atom percent. The alloy is heated treated at a temperature and for a time sufficient to achieve stress relief without inducing precipitation of discrete particles therein. Such a metallic glass alloy is especially suited for use in devices requiring high response to weak magnetic fields, such as ground fault interruptors and current/potential transformers.

REFERENCES:
patent: Re29989 (1979-05-01), Polk et al.
patent: 3856513 (1974-12-01), Chen et al.
patent: 4225339 (1980-09-01), Inomata et al.
patent: 4236946 (1980-12-01), Aboaf et al.
patent: 4462826 (1984-07-01), Inomata et al.
patent: 4473413 (1984-09-01), Nathasingh et al.

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