Sherman & Shalloway
Method of manufacturing and applying heat treatment to a magnetic core
 A magnetic core having a low core loss and having stable characteristics in a low magnetic permeability region can be obtained at a high yield by applying a heat treatment to a magnetic core main body obtained by winding or laminating a ferrous amorphous ribbon In a wet atmosphere containing a limited amount of steam. Further, a magnetic core having stable characteristics for the quality of products can always be obtained at a high yield even when magnetic ribbons as the blank have scattering, by adopting a method of applying a heat treatment to the magnetic core main body as described above by measuring the curie point, the differentiated crystallization temperature or the crystallization temperature of optionally sampled amorphous ribbons and comparing the measured value for the temperature with the curie point corresponding to the heat treatment temperature for the previously prepared aimed magnetic permeability, the differentiated crystallization temperature or the crystallization peak temperature, thereby determining an optimum value for the heat treatment temperature. 
Mitsui Petrochemical Industries, Ltd.
H H
H01F H01F
inventional inventional
Yoshihiko Masaru Masato Hiroshi
Hirota Yoshimura Takeuchi Ohmori