US 4,288,260 AGranted

Method of heat treatments of amorphous alloy ribbons

AssigneeMatsushita Electric Industrial Co., Ltd.

InventorsHarufumi Senno, Hiroshi Sakakima, Yukihiro Yanagiuchi, Tsuneo Inoue, Masatsugu Yamaguchi, Eiichi Hirota

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Abstract

A method of heat treatments of amorphous alloy ribbons comprises the sequential steps of; grinding amorphous alloy ribbon continuously fed at a predetermined speed (V) selectively varied in the range of 1 cm/sec.ltoreq.V.ltoreq.50 cm/sec, to uniformly finish the ribbon, and successively, heat-treating the ribbon with its surface contacting a stationary or rotating heating body having a surface temperature (T) defined in the range of (T.sub.cry -200.degree. C.).ltoreq.V.ltoreq.(T.sub.cry +50.degree. C.), where T.sub.cry is a crystallization point temperature of the alloy, to uniformly enhance the magnetic properties of the ribbon, and to remove the specific curlings inherently caused by so-called splat cooling manufacturing method, without causing any developments of brittleness of the ribbon mentioned above.

Claims7

Dependent claims

A method of heat treating an amorphous alloy ribbon manufactured by a splat cooling method, which comprises continuously transferring said amorphous alloy ribbon at a rate between 1 cm/sec and 50 cm/sec between two stations;

contacting the ribbon with at least one heating body intermediate the two stations so that at least one surface of the ribbon directly contacts the heating body during the transfer step, said heating body being maintained at a temperature range (T.degree.C.) which includes the crystallization point temperature T.sub.cry .degree.C. of said amorphous alloy ribbon such that the alloy is maintained in an amorphous state, such heat treatment being conducted for a time sufficient to enhance the magnetic properties of the alloy while maintaining the alloy in an amorphous state, wherein said temperature (T.degree.C.) can be defined by the following relationship of (T.sub.cry -200.degree. C.).ltoreq.T.ltoreq.(T.sub.cry +50.degree. C.).

Dependencies are inferred from the claim text.