Alps Electric Co., Ltd.

Hidetaka Kenmotsu

Takao Mizushima

Yutaka Naito

Shoji Yoshida

Kazuaki Ikarashi

Hisato Koshiba

An amorphous soft magnetic alloy powder which is produced by a water atomization method is provided. The powder contains an amorphous phase having a temperature interval &#x394;Tx of a supercooled liquid of 20K or more; having a hardness Hv of 1000 or less; is provided with a layer with a high concentration of Si at a surface portion thereof; and being represented by the following composition formula:FeCONiMPCBSi And M is one or two or more elements selected from Cr, Mo, W, V, Nb, Ta, Ti, Zr, Hf, Pt, Pd, and Au.

Amorphous soft magnetic alloy powder, and dust core and wave absorber using the same

A magnetic powder core comprises a molded article of a mixture of a glassy alloy powder and an insulating material. The glassy alloy comprises Fe and at least one element selected from Al, P, C, Si, and B, and has a texture primarily composed of an amorphous phase. The glassy alloy exhibits a temperature difference &#x394;T, which is represented by the equation &#x394;T=T&#x2212;T, of at least 20 K in a supercooled liquid, wherein Tindicates the crystallization temperature and Tindicates the glass transition temperature. The magnetic core precursor is produced mixing the glassy alloy powder with the insulating material, compacting the mixture to form a magnetic core precursor, and annealing the magnetic core precursor at a temperature in the range between (T&#x2212;170) K and TK to relieve the internal stress of the magnetic core precursor. The glassy alloy exhibits low coercive force and low core loss.

Low-loss magnetic powder core, and switching power supply, active filter, filter, and amplifying device using the same

A magnetic powder core comprises a molded article of a mixture of a glassy alloy powder and an insulating material. The glassy alloy comprises Fe and at least one element selected from Al, P, C, Si, and B, and has a texture primarily composed of an amorphous phase. The glassy alloy exhibits a temperature difference &Dgr;T , which is represented by the equation &Dgr;T &equals;T &minus;T , of at least 20 K in a supercooled liquid, wherein T indicates the crystallization temperature and T indicates the glass transition temperature. The magnetic core precursor is produced mixing the glassy alloy powder with the insulating material, compacting the mixture to form a magnetic core precursor, and annealing the magnetic core precursor at a temperature in the range between (T &minus;170) K and T K to relieve the internal stress of the magnetic core precursor. The glassy alloy exhibits low coercive force and low core loss.

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Niigata-ken, Japan

Hidetaka Kenmotsu