Alps Green Devices Co., Ltd.

Alps Alpine Co., Ltd.

Alps Electric Co., Ltd.

Other

Hisato Koshiba

Akihisa Inoue

Jun Okamoto

Takao Mizushima

Keiko Tsuchiya

Kinshiro Takadate

Seiichi Abiko

Kazuya Kaneko

Yutaka Naito

Shinichi Sasagawa

Yoshihiro Sudo

Shokan Yamashita

Yuichi Shonai

Hidetaka Kenmotsu

Akihoro Makino

Teruo Bitoh

Takafumi Hibino

Akio Hanada

Koichi Fujita

A dust core contains a powder of a crystalline magnetic material powder and a powder of an amorphous magnetic material. The sum of the content of the crystalline magnetic material powder and the content of the amorphous magnetic material powder is 83 mass percent or more. The mass ratio of the content of the crystalline magnetic material powder to the sum of the content of the crystalline magnetic material powder and the content of the amorphous magnetic material powder is 20 mass percent or less. The median diameter D50a of the amorphous magnetic material powder is greater than or equal to the median diameter D50c of the crystalline magnetic material powder. A 10% cumulative diameter D10a in a volume-based cumulative particle size distribution of the amorphous magnetic material powder is 9.5 μm or less.

Dust core, method for manufacturing dust core, inductor including dust core, and electronic/electric device including inductor

A powder magnetic core containing a magnetic particle of an Fe-based Cr-containing amorphous alloy and an organic binding substance is provided as a powder magnetic core with a small loss and high initial permeability. The depth profile of the composition determined from the surface of the magnetic particle in the powder magnetic core has the following characteristics. (1) An oxygen-containing region with an O/Fe ratio of 0.1 or more can be defined from the surface of the magnetic particle, and the oxygen-containing region has a depth of 35 nm or less from the surface. (2) A carbon-containing region with a C/O ratio of 1 or more can be defined from the surface of the magnetic particle, and the carbon-containing region has a depth of 5 nm or less from the surface. (3) The oxygen-containing region has a Cr-concentrated portion with a bulk Cr ratio of more than 1.

Powder magnetic core and method for producing the same

A dust core contains a powder of a crystalline magnetic material powder and a powder of an amorphous magnetic material. The sum of the content of the crystalline magnetic material powder and the content of the amorphous magnetic material powder is 83 mass percent or more. The mass ratio of the content of the crystalline magnetic material powder to the sum of the content of the crystalline magnetic material powder and the content of the amorphous magnetic material powder is 20 mass percent or less. The median diameter Dof the amorphous magnetic material powder is greater than or equal to the median diameter Dof the crystalline magnetic material powder.

Provided is an Fe-based alloy composition capable of forming an amorphous soft magnetic material which contains no P and which has a glass transition temperature T, the Fe-based alloy composition having a composition represented by the formula (FeT)MBCSi, where T is an arbitrary added element such as Ni and M is an arbitrary added element such as Cr, the formula satisfying the following conditions: 0&#x2264;a&#x2264;0.3, 11.0 at %&#x2264;b&#x2264;18.20 at %, 6.00 at %&#x2264;c&#x2264;17 at %, 0 at %&#x2264;d&#x2264;10 at %, and 0 at %&#x2264;x&#x2264;4 at %.

Fe-based alloy composition, soft magnetic material, magnetic members, electric/electronic component, and device

An Fe-based amorphous alloy of the present invention has a composition represented by formula (FeCrPCBSi(a, b, c, d, and e are in terms of at %), where 0 at %&#x2266;a&#x2266;1.9 at %, 1.7 at %&#x2266;b&#x2266;8.0 at %, 0 at %&#x2266;e&#x2266;1.0 at %, an Fe content (100-a-b-c-d-e) is 77 at % or more, 19 at %&#x2266;b+c+d+e&#x2266;21.1 at %, 0.08&#x2266;b/(b+c+d)&#x2266;0.43, 0.06&#x2266;c/(c+d)&#x2266;0.87, and the Fe-based amorphous alloy has a glass transition temperature (Tg).

Fe-based amorphous alloy and dust core made using Fe-based amorphous alloy powder

An Fe-based amorphous alloy of the present invention has a composition formula represented by FeNiSnCrPCBSi, and in the formula, 1 at %&#x2266;a&#x2266;10 at %, 0 at %&#x2266;b&#x2266;3 at %, 0 at %&#x2266;c&#x2266;6 at %, 6.8 at %&#x2266;x&#x2266;10.8 at %, 2.2 at %&#x2266;y&#x2266;9.8 at %, 0 at %&#x2266;z&#x2266;4.2 at %, and 0 at %&#x2266;t&#x2266;3.9 at % hold. Accordingly, an Fe-based amorphous alloy used for a powder core and/or a coil encapsulated powder core having a low glass transition temperature (Tg), a high conversion vitrification temperature (Tg/Tm), and excellent magnetization and corrosion resistance can be manufactured.

Fe-based amorphous alloy, powder core using the same, and coil encapsulated powder core

An Fe-based amorphous alloy powder of the present invention has a composition represented by (FeNiSnCrPCBSi)M. In this composition, 0 at %&#x2266;a&#x2266;10 at %, 0 at %&#x2266;b&#x2266;3 at %, 0 at %&#x2266;c&#x2266;6 at %, 6.8 at %&#x2266;x&#x2266;10.8 at %, 2.2 at %&#x2266;y&#x2266;9.8 at %, 0 at %&#x2266;z&#x2266;4.2 at %, and 0 at %&#x2266;t&#x2266;3.9 at % hold, a metal element M is at least one selected from the group consisting of Ti, Al, Mn, Zr, Hf, V, Nb, Ta, Mo, and W, and the addition amount &#x3b1; of the metal element M satisfies 0.04 wt %&#x2266;&#x3b1;&#x2266;0.6 wt %. Accordingly, besides a decrease of a glass transition temperature (Tg), an excellent corrosion resistance and high magnetic characteristics can be obtained.

Fe-based amorphous alloy powder, dust core using the same, and coil-embedded dust core

An Fe-based amorphous alloy of the present invention has a composition formula represented by FeNiSnCrPCBSi, and in the formula, 0 at %&#x2266;a&#x2266;10 at %, 0 at %&#x2266;b&#x2266;3 at %, 0 at %&#x2266;c&#x2266;6 at %, 6.8 at %&#x2266;x&#x2266;10.8 at %, 2.2 at %&#x2266;y&#x2266;9.8 at %, 0 at %&#x2266;z&#x2266;4.2 at %, and 0 at %&#x2266;t&#x2266;3.9 at % hold. Accordingly, an Fe-based amorphous alloy used for a powder core and/or a coil encapsulated powder core having a low glass transition temperature (Tg), a high conversion vitrification temperature (Tg/Tm), and excellent magnetization and corrosion resistance can be manufactured.

An Fe-based soft magnetic alloy includes: Fe; and a component R, wherein the component R contains at least one of P, C, B, and Si, there is a temperature difference of equal to or greater than 20&#xb0; C. between a precipitation temperature of an &#x3b1;-Fe crystal phase and a precipitation temperature of an Fe compound, the Fe-based soft magnetic alloy is formed of a mixed-phase structure in which an amorphous phase and the &#x3b1;-Fe crystal phase are mixed, and a diameter of a crystallite of the &#x3b1;-Fe crystal phase is equal to or smaller than 50 nm, and a volume fraction of the &#x3b1;-Fe crystal phase to the total is equal to or lower than 40%. In addition, the composition formula is represented by FeJR, a component J contains at least one of Cr, Co, Ni, and Nb, and 0 at %&#x2266;x&#x2266;6 at %, 17 at %&#x2266;u&#x2266;25 at %, and 17 at %&#x2266;x+u&#x2266;27.1 at % are satisfied.

Fe-based soft magnetic alloy and dust core using fe-based soft magnetic alloy

Embodiments of the present disclosure are directed to an Fe-based amorphous magnetic alloy and method that includes 4 at. % or less of a low temperature annealing-enabling element M and 10 at. % or less of nickel (Ni). The total amount of the low temperature annealing-enabling element M and nickel (Ni) may be 2 at. % or more and 10 at. % or less.

Fe-based amorphous magnetic alloy and magnetic sheet

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 magneto-impedance element, showing a change in impedance in response to an external magnetic field when an alternating current is applied, is composed of a glassy alloy. The glassy alloy is composed of at least one base metal selected from the group consisting of Fe, Co and Ni; at least one additional metal selected from the group consisting of Zr, Nb, Ta, Hf, Mo, Ti and V; and B. The glassy alloy has a temperature region &Dgr;T,, of the supercooling liquid zone of 20&deg; C. or more which is represented by the equation &Dgr;T,&equals;T,&minus;T,wherein T,is the crystallization temperature and T,is the glass transition temperature. A magnetic head, a thin film magnetic head, an azimuth sensor and an autocanceler are provided with the MI element.

Growing community of inventors

Niigata-ken, Japan

Hisato Koshiba