Fe-Ni alloy fine powder of flat shape

Details Fe-Ni alloy fine powder of flat shape Fe-Ni alloy fine powder of flat shape

1990-11-29

1992-08-04

Wyszomerski, George

Metal treatment

Stock

Magnetic

420458, H01F 1147, C22C 1903

Patent

active

051355868

ABSTRACT:
A flat-shaped fine Fe-Ni alloy powder suitable for use as a magnetic shield coating material for cards or the like. The power has a mean particle size of 0.1 to 30 .mu.m, a mean thickness not greater than 2 .mu.m and a coercive force not greater than 400 A/m. The flat-shaped fine powder is produced by preparing an Fe-Ni alloy powder of a composition which exhibits, in a bulk state, a saturated magnetostriction constant value falling within the range of .+-.15.times.10.sup.-6 and which contains, by weight, 70 to 83% Ni, 2 to 6% Mo, 3 to 6% Cu, 1 to 2% Mn, not more than 0.05% C and the balance Fe and incidental impurities, pulverizing the alloy powder by an attrition mill, and annealing the pulverized powder in a fluidized or moving state in a substantially non-oxidizing atmosphere.

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