Metal treatment – Stock – Magnetic
Patent
1988-08-18
1990-07-03
Sheehan, John P.
Metal treatment
Stock
Magnetic
148403, 420435, 420436, 420437, 420438, 420439, 420440, H01F 104
Patent
active
049382675
ABSTRACT:
A series of glassy metal alloys with near zero magnetostriction and Perminvar characteristics of relatively constant permeability at low magnetic field excitations and constricted hysteresis loops is disclosed. The glassy alloys have the compositions Co.sub.a Fe.sub.b Ni.sub.c M.sub.d B.sub.e Si.sub.f where M is at least one member selected from the group consisting of Cr, Mo, Mn and Nb, and "a-f" are in atom percent where "a" ranges from about 66 to 71, "b" ranges from about 2.5 to 4.5, "c" ranges from about 0 to 3, "d" ranges from about 0 to 2 except when M.dbd.Mn in which case "d" ranges from about 0 to 4, "e" ranges from about 6 to 24 and "f" ranges from about 0 to 19, with the proviso that the sum of "a", "b" and "c" ranges from about 72 to 76 and the sum of "e" and "f" ranges from about 25 to 27. The glassy alloy has a value of magnetostriction ranging from about -1.times.10.sup. -6 to about +1.times.10.sup.-6, a saturation induction ranging from about 0.5 to 1 Tesla, a Curie temperature ranging from about 200 to 450.degree. C. and a first crystallization temperature ranging from about 440 to 570.degree. C. The glassy alloy is heat-treated between about 50 and 110.degree. C. below its first crystallization temperature for a time period ranging from about 15 to 180 minutes, then cooled to room temperature at a rate slower than about -60.degree. C./min.
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Allied-Signal Inc.
Hampilos Gus T.
Sheehan John P.
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