Method of lowering permeability of difficult-to-work Co alloy

Details Method of lowering permeability of difficult-to-work Co alloy Method of lowering permeability of difficult-to-work Co alloy

1994-10-25

1995-11-21

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148674, H01F 100

Patent

active

054683050

ABSTRACT:
Disclosed is a method of lowering the permeability of a difficult-to-work Co alloy by introducing high working strain. It includes the steps of: making a Co alloy by melting, the Co alloy containing 0.1 to 40 atomic % of Ni and/or 0.1 to 40 atomic % of Pt, and 0.5 to 10 atomic % of one or more kinds of elements selected from a group consisting of Ta, Mo, W, V, Nb, Hf, Zr, Ti and B (the upper limit of B: 5 atomic %), the balance being 50 atomic % or more of Co and inevitable impurities; preparing a sheet like ingot having a thickness of 30 mm or less using the Co alloy; and covering the surface of the ingot with a metal capsule or coating it with a glass lubricant, and hot-rolling the treated ingot in such a manner that the reduction is performed in two stages accompanied by re-heating and the whole reduction is 30% or more.

REFERENCES:
patent: 5282946 (1994-02-01), Kinoshita et al.
patent: 5334267 (1994-08-01), Taniguchi et al.

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