Hitachi Metals, Ltd.

Metglas, Inc.

Proterial, Ltd.

Naoki Ito

Motoki Ohta

Yoshihito Yoshizawa

Ronald Joseph Martis

Daichi Azuma

Eric Theisen

Makoto Sasaki

John Paul Webb

Shinichi Kazui

Donald Robert Reed, Jr

Eric Alan Theisen

Jr Donald Robert Reed

A method of producing an amorphous alloy ribbon having a composition of Fe100-a-bBaSibCc (13.0 atom %≤a≤16.0 atom %, 2.5 atom %≤b≤5.0 atom %, 0.20 atom %≤c≤0.35 atom %, and 79.0 atom %≤(100-a-b)≤83.0 atom %) includes: preparing an alloy ribbon; and, in a state in which the alloy ribbon is tensioned with a tensile stress of from 5 MPa to 100 MPa, increasing a temperature of the alloy ribbon to from 410° C. to 480° C., at an average temperature increase rate of from 50° C./sec to less than 800° C./sec, and decreasing a temperature of the thus heated alloy ribbon to a temperature of a heat transfer medium for temperature-decreasing, at an average temperature decrease rate of from 120° C./sec to less than 600° C./sec, wherein the temperature increase and decrease are performed by contacting the traveling alloy ribbon with a heat transfer medium.

Amorphous alloy ribbon, production method therefor, and amorphous alloy ribbon piece

A magnetic core includes a nanocrystalline alloy ribbon having a composition represented by FeCuBSiAX, where 0.6&#x2264;x&#x3c;1.2, 10&#x2264;y&#x2264;20, 0&#x2264;(y+z)&#x2264;24, and 0&#x2264;a&#x2264;10, 0&#x2264;b&#x2264;5, all numbers being in atomic percent, with the balance being Fe and incidental impurities, and where A is an optional inclusion of at least one element selected from Ni, Mn, Co, V, Cr, Ti, Zr, Nb, Mo, Hf, Ta and W, and X is an optional inclusion of at least one element selected from Re, Y, Zn, As, In, Sn, and rare earth elements. The nanocrylstalline alloy ribbon has a local structure such that nanocrystals with average particle sizes of less than 40 nm are dispersed in an amorphous matrix and are occupying more than 30 volume percent of the ribbon.

Magnetic core based on a nanocrystalline magnetic alloy

A nanocrystalline alloy ribbon has an alloy composition represented by FeCuBSiAXwhere 0.6&#x2264;x&#x3c;1.2, 10&#x2264;y&#x2264;20, 0&#x3c;z&#x2265;10, 10(y+z)24, 0&#x2264;a&#x2264;10, O&#x2264;b&#x2264;5, with the balance being Fe and incidental impurities, where A is an optional inclusion of at least one element selected from Ni, Mn, Co, V, Cr, Ti, Zr, Nb, Mo, Hf, Ta and W, and X is an optional inclusion of at least one element selected from Re, Y, Zn, As, In, Sn, and rare earth elements, all numbers being in atomic percent. The ribbon has a local structure having nanocrystals with average particle sizes of less than 40 nm dispersed in an amorphous matrix, the nanocrystals occupying more than 30 volume percent of the ribbon and has a radius of ribbon curvature of at least 200 mm.

Nanocrystalline magnetic alloy and method of heat-treatment thereof

A rapidly quenched Fe-based soft-magnetic alloy ribbon having wave-like undulations on a free surface, the wave-like undulations having transverse troughs arranged at substantially constant intervals in a longitudinal direction, and the troughs having an average amplitude D of 20 mm or less, is produced by a method comprising (a) keeping a transverse temperature distribution in a melt nozzle within &#xb1;15&#xb0; C. to have as small a temperature distribution as possible in a melt paddle of the alloy, and (b) forming numerous fine linear scratches on a cooling roll surface by a wire brush, thereby providing a ground surface of the cooling roll with an arithmetical mean (average) roughness Ra of 0.1-1 &#x3bc;m and a maximum roughness depth Rmax of 0.5-10 &#x3bc;m.

Rapidly quenched Fe-based soft-magnetic alloy ribbon and its production method and core

An iron-based soft magnetic alloy greater than 63.5 mm in width, a thickness between 13 and 20 microns and having a composition represented by the following formula:(FeM)CuSiBM'M&#x2033;Xwherein M is Co and/or Ni, M&#x2032; is at least one element selected from the group consisting of Nb, W, Ta, Zr, Hf, Ti and Mo, M&#x2033; is at least one element selected from the group consisting of V, Cr, Mn, Al, elements in the platinum group, Sc, Y, rare earth elements, Au, Zn, Sn and Re, X is at least one element selected from the group consisting of C, Ge, P, Ga, Sb, In, Be and As, and a, x, y, z, p, q and r respectively satisfy 0&#x2264;a&#x2264;0.5, 0.1&#x2264;x&#x2264;3, 0&#x2264;y&#x2264;30, 1&#x2264;z&#x2264;25, 5&#x2264;y+z&#x2264;30, 0.1&#x2264;p&#x2264;30, q&#x2264;10 and r&#x2264;10, the alloy being at least 50% crystalline with an average particle size of 100 nm or less. This alloy has low core loss, high permeability and low magnetostriction.

Wide iron-based amorphous alloy, precursor to nanocrystalline alloy

A soft-magnetic, amorphous alloy ribbon produced by a rapid quenching method, having transverse lines of recesses formed on its surface by laser beams with predetermined longitudinal intervals, with a doughnut-shaped projection formed around each recess; doughnut-shaped projections having smooth surfaces substantially free from splashes of the alloy melted by the irradiation of laser beams, and a height tof 2 &#x3bc;m or less; and a ratio t/T of the depth tof the recesses to the thickness T of the ribbon being in a range of 0.025-0.18, thereby having low iron loss and low apparent power.

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Naoki Ito