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

1988-03-07

1989-05-30

Sheehan, John P.

Metal treatment

Stock

Magnetic

420106, 420117, 420121, H01F 104

Patent

active

048348147

ABSTRACT:
Metallic glasses having high permeability, low magnetostriction, low coercivity, low ac core loss, low exciting power and high thermal stability are disclosed. The metallic glasses consist essentially of a composition defined by the formula Fe.sub.a M.sub.b B.sub.c Si.sub.d C.sub.e in which "a"-"e" are in atom percent, the sum ("a"+"b"+"c"+"d"+"e") equals 100, M is at least one element selected from the group consisting of Mo, Cr, Ti, Zr, Hf, Nb, Ta, V and W, "a" ranges from about 66 to 81.5, "b" ranges from about 0.5 to 6, "c" ranges from about 10 to 26, "d" ranges from about 1 to 12, "e" ranges from about 0 to 2 and the sum ("c"+"d"+"e") ranges from about 18 to 28, and have been annealed at a temperature, T.sub.a, for a time, t.sub.a, sufficient to induce precipitation of discrete particles therein. Such metallic glasses are suitable for use in tape recorder heads, relay cores, transformers and the like.

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