https://iopscience.iop.org/article/10.1088/1468-6996/10/5/053001/pdf

Electric current activated/assisted sintering (ECAS): a review of patents 1906–2008

Magnetic component assemblies and core structures including coil coupling arrangements, that are advantageously utilized in providing surface mount magnetic components such as inductors and transformers.

Magnetic components and methods of manufacturing the same

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 ΔTx 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: 
Fe 100-a-b-x-y-z-w-t CO a Ni b M x P y C z B w Si t 
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

An amorphous soft magnetic alloy of the formula (Fe 1-α TM α ) 100-w-x-y-z P w B x L y Si z Ti p C q Mn r Cu s , wherein TM is Co or Ni; L is Al, Cr, Zr, Mo or Nb; 0≦α≦0.3, 2≦w≦18 at %, 2≦x≦18 at %, 15≦w+x≦23 at %, 1 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<Al≦5 at %, 1≦Cr≦4 at %, 0<Zr≦5 at %, 2≦Mo≦5 at %, and 2≦Nb≦5 at %; the alloy has a crystallization start temperature (Tx) which is 550° C. or less, a glass transition temperature (Tg) which is 520° C. or less, and a supercooled liquid region represented by ΔTx=Tx−Tg, which is 20° C. or more.

Amorphous soft magnetic alloy and inductance component using the same

PROBLEM TO BE SOLVED: To provide a dust core in which insulation between powder particles will not deteriorate, even if a resin binder is reduced in a gas atomized powder and moreover, core loss can be reduced, and to provide a manufacturing method therefor. SOLUTION: The method of manufacturing the dust core includes coating the surface of a soft magnetic powder with an organic metal coupling agent, coating the processed powder with an organic metal resin, capable of forming an insulating oxide, press-molding and applying heat treatment thereto, thereby forming an insulative oxide coating on the surface of the soft magnetic powder. In applying coating processing with the organic metal resin capable of forming an insulating oxide to the processed powder, the processed powder is mixed with the organic metal resin, and heat treatment is executed, and thereby generating a metaloxane bond between the soft magnetic powder and the organic metal coupling agent. In executing pressure-molding processing, a lubricating agent is mixed in the processed powder. Although it is preferable that a gas atomized powder be used as the soft magnetic powder, however, a water atomized powder or a water gas atomized power can be used by changing the blending proportion. The organic metal coupling agent is a silane coupling agent, and the organic metal resin is a silicone resin. In the manufactured dust core, an organic metal layer is formed on the surface of the soft magnetic powder via a coating layer of the organic metal coupling agent. COPYRIGHT: (C)2009,JPO&INPIT

Dust core and manufacturing method thereof

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 ΔTx, which is represented by the equation ΔTx=Tx−Tg, of at least 20 K in a supercooled liquid, wherein Tx indicates the crystallization temperature and Tg 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 (Tg−170) K and Tg K 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

PROBLEM TO BE SOLVED: To provide amorphous soft magnetic alloy powder which has high saturation magnetization and low core loss and which is almost spherical and manufactured by water atomization method, and to provide a green compact core and radio wave absorber using the same. SOLUTION: This amorphous soft magnetic alloy powder is formed substantially spherical by the water atomization method. The powder mainly consists of Fe and contains at least P, C and B, and is formed of amorphous soft magnetic alloy powder consisting of an amorphous phase with a temperature interval ΔTx of the supercooled liquid of ≥ 20K. A green compact core is formed by solidifying the granulated mixture of this amorphous soft magnetic alloy powder, insulator and lubricant. The radio wave absorber is formed by mixing the amorphous soft magnetic alloy powder the particles of which is flattened and insulator. COPYRIGHT: (C)2004,JPO

Amorphous soft magnetic alloy powder, and green compact core and radio wave absorber using the same

PROBLEM TO BE SOLVED: To provide an amorphous soft-magnetic alloy powder and a flat amorphous soft-magnetic alloy powder which have improved permeability and direct-current-superimposed characteristics while keeping core loss low, and to provide a compacted core and electromagnetic wave absorber composed of those powders. SOLUTION: The amorphous soft-magnetic alloy powder is produced with a water atomization method; is expressed by the following composition formula: Fe 100-a-b-x-y-z-w-t Co a Ni b M x P y C z B w Si t , wherein M represents one or more elements selected from Cr, Mo, W, V, Nb, Ta, Ti, Zr, Hf, Pt, Pd and Au; is made of an amorphous phase with a temperature difference ΔTx of a supercooled liquid of 20 K or higher; has hardness expressed by Hv≤1,000; and has a high concentration layer of Si formed on a surface part. COPYRIGHT: (C)2006,JPO&NCIPI

Amorphous soft-magnetic alloy powder, and powder magnetic core and electromagnetic wave absorber using it

PURPOSE: A noncrystalline soft magnetic alloy powder is provided which has high saturated magnetization and low core loss and is manufactured in a near-spherical shape by water spraying, and dust core and electric wave absorber using the same are provided. CONSTITUTION: In a noncrystalline soft magnetic alloy powder that is powder formed in an approximately spherical shape by water spraying, the noncrystalline soft magnetic alloy powder comprises Fe as a principal component and at least one or more of P, C and B and is formed in an amorphous phase in which a temperature interval (ΔTx) of supercooling liquid represented as ΔTx=Tx-Tg is more than or equal to 20 K, where Tx and Tg respectively denote the crystallization starting temperature and glass transition temperature. The dust core is manufactured by mixing a plural or one of the noncrystalline soft magnetic alloy powder containing Fe as a principal component and at least one or more elements selected from among P, C and B and having an amorphous phase as the main phase with insulating material and lubricating agent and molding the mixture, wherein the insulating material is used as a binder for solidifying the mixture during molding of the mixture.

Hidetaka Kenmotsu

Papers

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

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

Amorphous soft magnetic alloy powder, and green compact core and radio wave absorber using the same

Amorphous soft-magnetic alloy powder, and powder magnetic core and electromagnetic wave absorber using it

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