Kabushiki Kaisha Toshiba

Kabushiki Kaishi Toshiba

Yumiko Takahashi

Takao Sawa

Masami Okamura

Susumu Matsushita

Yumie Watanabe

Takamichi Inaba

Yoshiyuki Yamauchi

Yoshiyuki Yamaguchi

Hydrogen-storage alloy and alkali secondary battery using same

A magnetic core is obtained by winding or laminating at least one alloy ribbon and has excellent squareness characteristic and magnetic saturation characteristic in a high frequency region wherein the squareness ratio of the magnetic core is improved by restricting the surface roughness of the alloy ribbon to specific regions.

Magnetic core

An Fe-based soft magnetic alloy is consisted essentially of fine crystal grains constituting 50% or more of the alloy structure by area %. The Fe-based soft magnetic alloy has the composition substantially represented by the general formula: Fe.sub.100-a-b-c-d-e-f X.sub.a M.sub.b M'.sub.c A.sub.d Si.sub.e Z.sub.f (wherein X is at least one compound selected from the ceramic materials fusible when the composition is fused and rapidly quenched to form a rapidly cooled alloy, M is at least one element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W, M' is at least one element selected from the group consisting of Mn, elements in the platinum group, Ag, Au, Zn, Al, Ga, In, Sn, Cu and rare each elements, A is at least one element selected from among Co and Ni, Z is at least one element selected from the group consisting of B, C, P and Ge. Said a, b, c, d, e and f respectively satisfy 0.1.ltoreq.a.ltoreq.5, 0.1.ltoreq.b.ltoreq.10, 0.ltoreq.c.ltoreq.10, 0.ltoreq.d.ltoreq.40, 5.ltoreq.e.ltoreq.25, 2.ltoreq.f.ltoreq.20, 12.ltoreq.e+f.ltoreq.30, provided that all the numerals in the said formulae are in terms of atomic %). The inorganic compound represented by X of the above general formula makes the precipitating crystal grains super fine, thereby reducing dependence of the soft magnetic properties on the heat treatment temperature.

Fe-based soft magnetic alloy, method of producing same and magnetic core

An Fe-based soft magnetic alloy essentially consisting of an Fe-based alloy including fine crystal grains used for such as a magnetic core. An average size of the fine crystal grains is controlled to 300.ANG. or less. Each of the fine crystal grains is composed of a body-centered cubic phase at least partially including a super lattice. This alloy has a high saturation flux density and excellent soft magnetic characteristics such as a low iron loss and a high magnetic permeability. This alloy is suitable as a core material for various kinds of choke coils.

Fe-based soft magnetic alloy

An Fe-based soft magnetic alloy essentially consisting of an Fe-based alloy including fine crystal grains used for such as a magnetic core. An average size of the fine crystal grains is controlled to 300 .ANG. or less. Each of the fine crystal grains is composed of a body-centered cubic phase at least partially including a super lattice. This alloy has a high saturation flux density and excellent soft magnetic characteristics such as a low iron loss and a high magnetic permeability.

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Koshigaya, Japan

Yumiko Takahashi