Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1992-10-16
1995-03-07
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148108, 148122, H01F 100
Patent
active
053954602
ABSTRACT:
The present invention discloses a process for enhancing the harmonic output of a marker comprising the steps of providing an amorphous alloy having a composition (Fe.sub.1-x Ni.sub.x).sub.a M.sub.b (B.sub.1-y Si.sub.y).sub.c wherein "x" ranges from about 0.2 to about 0.9, "y" ranges from 0 up to about 0.5, "a" is between about 60 and about 90 atomic %, "b" is between about 0.1 to about 10 atomic %, "c" is between about 0.1 to about 30 atomic percent, and M is at least one metal selected from the group consisting of Mo, Cr, Hf, Nb, Ta, Ti, V, W, and Zr, the amorphous alloy having at least two crystallization temperatures, a first crystallization temperature at which a nanocrystalline phase is formed, and a second crystallization temperature at which a second crystalline phase is formed; annealing the amorphous alloy at a temperature between the first and the second crystallization temperatures for a time sufficient to increase at least one harmonic characteristic of the element. Harmonic markers produced thereby are also disclosed.
REFERENCES:
patent: 4221257 (1980-09-01), Narasimhan
patent: 4945339 (1990-07-01), Yamauchi et al.
patent: 5313192 (1994-05-01), Ho et al.
U.S. patent application Ser. No. 896,505 filed on Jun. 2, 1992.
Allied-Signal Inc.
Brown Melanie L.
Buff Ernest D.
Sheehan John P.
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