Tokin Corporation

Jfe Steel Corporation

Tohoku University

Nec Tokin Corporation

Other

National Institute of Advanced Industrial Science and Technology

Tohoku Magnet Institute Co., Ltd.

Jfe Precision Corporation

Akiri Urata

Takuya Takashita

Makoto Nakaseko

Miho Chiba

Hiroyuki Matsumoto

Akihiro Makino

Masato Kuno

Yosuke Imano

Makoto Yamaki

Yasunobu Yamada

Naoki Yamamoto

Akio Kobayashi

Shigeyoshi Yoshida

Mineo Muraki

Teruhiko Fujiwara

Naoto Onishi

Akihisa Inoue

Naomichi Nakamura

Kimihiro Ozaki

Hoshiaki Terao

Toshinori Tsuda

Raita Wada

Yu Kanamori

Koichi Okamoto

Shoichi Sato

Alloy powder includes particles. The particles include specific particles. Each of the specific particles has a surface layer on which a divided trace is formed, the divided trace being a mark at which molten alloy is divided; and the divided trace has at least a hill-like ridge aggregate structure or a combination of a crater structure and the hill-like ridge aggregate structure, the hill-like ridge aggregate structure being an aggregate of a plurality of hill-like ridges.

Alloy powder, nanocrystalline powder and magnetic core

A manufacturing method of alloy powder comprises a liquid film forming step, a supplying step and a dividing step. In the liquid film forming step, a high speed fluid made of coolant liquid is shaped into a liquid film which has a predetermined thickness of 0.1 mm or more and receives a predetermined acceleration of 2.0×10G or more along a thickness direction. In the supplying step, molten alloy which is not divided into a size of the predetermined thickness or less is supplied to the liquid film. In the dividing step, the molten alloy is divided into the size of the predetermined thickness or less by the high speed fluid to make alloy particles and keeping the alloy particles in the liquid film by the predetermined acceleration so that the alloy particles are continuously cooled in the high speed fluid.

Manufacturing method of alloy powder

Provided is a method of manufacturing a soft magnetic dust core. The method includes: preparing coated powder including amorphous powder made of an Fe-B-Si-P-C-Cu-based alloy, an Fe-B-P-C-Cu-based alloy, an Fe-B-Si-P-Cu-based alloy, or an Fe-B-P-Cu-based alloy, with a first initial crystallization temperature Tand a second initial crystallization temperature T; and a coating formed on a surface of particles of the amorphous powder; applying a compacting pressure to the coated powder or a mixture of the coated powder and the amorphous powder at a temperature equal to or lower than T−100 K; and heating to a maximum end-point temperature equal to or higher than T−50 K and lower than Twith the compacting pressure being applied.

Method of manufacturing soft magnetic dust core

Provided is an Fe-based nanocrystalline alloy powder. The Fe-based nanocrystalline alloy powder has a chemical composition, excluding inevitable impurities, represented by a composition formula of FeSiBPCuM, where the M in the composition formula is at least one element selected from the group consisting of Nb, Mo, Zr, Ta, W, Hf, Ti, V, Cr, Mn, C, Al, S, O, and N, 79 at %≤a≤84.5 at %, 0 at %≤b<6 at %, 0 at %<c≤10 at %, 4 at %<d≤11 at %, 0.2 at %≤e≤0.53 at %, 0 at %≤f≤4 at %, a+b+c+d+e+f=100 at %, a degree of crystallinity is more than 10% by volume, and an Fe crystallite diameter of the Fe-based nanocrystalline alloy powder is 50 nm or less.

Fe-based nanocrystalline alloy powder, magnetic component, and dust core

This method for manufacturing a powder core is provided with: a step for heat-treating amorphous soft magnetic alloy powder to obtain nanocrystal powder; a step for obtaining granulated powder from nanocrystal powder, malleable powder, and a binder; a step for pressure-molding the granulated powder to obtain a green compact; a step for curing the binder by heat-treating the green compact at a temperature which is equal to or higher than the curing initiation temperature of the binder and lower than the crystallization initiation temperature of the amorphous soft magnetic alloy powder.

Method for manufacturing a powder core, the powder core and an inductor

Alloy powder comprises particles. The particles include specific particles. Each of the specific particles has a surface layer on which a divided trace is formed.

This soft magnetic powder is represented by composition formula FeSiBPCuwith the exception of unavoidable impurities. In the composition formula, a, b, c, d and e satisfy 79&#x2264;a&#x2264;84.5 at %, 0&#x2264;b&#x3c;6 at %, 4&#x2264;c&#x2264;10 at %, 4&#x3c;d&#x2264;11 at %, 0.2&#x2264;e&#x3c;0.4 at %, and a+b+c+d+e=100 at %.

Soft magnetic powder, Fe-based nanocrystalline alloy powder, magnetic component and dust core

Provided is a soft magnetic powder that can produce a dust core having excellent magnetic properties. The soft magnetic powder has a chemical composition, excluding inevitable impurities, represented by a composition formula of FeSiBPCuM, where the M is at least one element selected from the group consisting of Nb, Mo, Zr, Ta, W, Hf, Ti, V, Cr, Mn, C, Al, S, O, and N, 79 at %&#x2264;a&#x2264;84.5 at %, 0 at %&#x2264;b&#x3c;6 at %, 0 at %&#x3c;c&#x2264;10 at %, 4 at %&#x3c;d&#x2264;11 at %, 0.2 at %&#x2264;e&#x2264;0.53 at %, 0 at %&#x2264;f&#x2264;4 at %, a+b+c+d+e+f=100 at %, a particle size is 1 mm or less, and a median of circularity of particles constituting the soft magnetic powder is 0.4 or more and 1.0 or less.

Soft magnetic powder, Fe-based nanocrystalline alloy powder, magnetic component, and dust core

An amorphous soft magnetic alloy of the formula (FeTM)PBLSiTiCMnCu, wherein TM is Co or Ni; L is Al, Cr, Zr, Mo or Nb; 0&#x2264;&#x3b1;&#x2264;0.3, 2&#x2264;w&#x2264;18 at %, 2&#x2264;x&#x2264;18 at %, 15&#x2264;w+x&#x2264;23 at %, 1&#x3c;y&#x2264;5 at %, 0&#x2264;z&#x2264;4 at %; p, q, r, and s represents an addition ratio such that the total mass of Fe, TM, P, B, L and Si is 100, and 0&#x2264;p&#x2264;0.3, 0&#x2264;q&#x2264;0.5, 0&#x2264;r&#x2264;2, 0&#x2264;s&#x2264;1 and r+s&#x3e;0; the composition fulfills one of the following conditions: L is Cr, Zr, Mo or Nb; or L is a combination of Al and Cr, Zr, Mo or Nb, wherein 0&#x3c;Al&#x2264;5 at %, 1&#x2264;Cr&#x2264;4 at %, 0&#x3c;Zr&#x2264;5 at %, 2&#x2264;Mo&#x2264;5 at %, and 2&#x2264;Nb&#x2264;5 at %; the alloy has a crystallization start temperature (Tx) which is 550&#xb0; C. or less, a glass transition temperature (Tg) which is 520&#xb0; C. or less, and a supercooled liquid region represented by &#x394;Tx=Tx&#x2212;Tg, which is 20&#xb0; C. or more.

Amorphous soft magnetic alloy and inductance component using the same

A soft magnetic powder is represented by FeSiBPCrMexcept for inevitable impurities, wherein: M is one or more element selected from V, Mn, Co, Ni, Cu and Zn; 0 atomic %&#x2264;b&#x2264;6 atomic %; 4 atomic %&#x2264;c&#x2264;10 atomic %; 5 atomic %&#x2264;d&#x2264;12 atomic %; 0 atomic %&#x3c;e; 0.4 atomic %&#x2264;f&#x3c;6 atomic %; and a+b+c+d+e+f=100 atomic %.

Soft magnetic powder, dust core, magnetic compound and method of manufacturing dust core

An Fe-based nano-crystalline alloy formed from an alloy composition of (FeE)BPCuhaving an amorphous phase as a main phase, wherein 79&#x2266;100-X-Y-Z&#x2266;86 atomic %, 4&#x2266;X&#x2266;9 atomic %, 1&#x2266;Y&#x2266;10 atomic %, and 0.5&#x2266;Z&#x3c;1.2 atomic %, and wherein (FeE) includes Fe and at least one element selected from the group consisting of Ti, Zr, Hf, Nb, Ta, Mo, W, Cr, Al, Mn, Ag, Zn, Sn, As, Sb, Bi, Y, N, O and a rare-earth element, wherein a combined total of said at least one element selected from the group consisting of Ti, Zr, Hf, Nb, Ta, Mo, W, Cr, Al, Mn, Ag, Zn, Sn, As, Sb, Bi, Y, N, O and a rare-earth element is in an amount of 3 atomic % or less relative to the whole composition.

Fe-based nano-crystalline alloy

An alloy composition of FeBPCu, where 4&#x2266;X&#x2266;14 atomic %, 0&#x3c;Y&#x2266;10 atomic %, and 0.5&#x2266;Z&#x2266;2 atomic %. This alloy composition has an amorphous phase as a main phase. This alloy composition is used as a starting material and exposed to a heat-treatment so that nanocrystals comprising no more than 25 nm of bccFe can be crystallized. Thus, an Fe-based nano-crystalline alloy having superior magnetic properties can be obtained.

Alloy composition, Fe-based nano-crystalline alloy and forming method of the same

A soft magnetic alloy contains P, B, and Cu as essential components. As a preferred example, an Fe-based alloy contains Fe of 70 atomic % or more, B of 5 atomic % to 25 atomic %, Cu of 1.5 atomic % or less (excluding zero), and P of 10 atomic or less (excluding zero).

Soft magnetic alloy, magnetic part using soft magnetic alloy, and method of manufacturing same

A high-frequency core is a molded body obtained by molding a mixture of a soft magnetic metallic glass powder and a binder in an amount of 10% or less in mass ratio. The powder has an alloy composition represented by a general formula (FeNiCo)(MM')TB(where 0&#x2266;a&#x2266;0.30, 0&#x2266;b&#x2266;0.50, 0&#x2266;a+b&#x2266;0.50, 0&#x2266;p&#x2266;0.5, 1 atomic %&#x2266;x&#x2266;5 atomic %, 1 atomic %&#x2266;y&#x2266;12 atomic %, 12 atomic %&#x2266;z&#x2266;25 atomic %, 22&#x2266;(x+y+z)&#x2266;32, M being at least one selected from Zr, Nb, Ta, Hf, Mo, Ti, V, Cr, and W, M&#x2032; being at least one selected from Zn, Sn, R (R being at least one element selected from rare earth metals including Y), T being at least one selected from Al, Si, C, and P). An inductance component includes the high-frequency core and at least one turn of winding wound around the core.

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Sendai, Japan

Akiri Urata