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Title:
PRODUCTION OF NANO-CRYSTAL ALLOY WITH HIGH MAGNETIC PERMEABILITY
Document Type and Number:
Japanese Patent JP3856245
Kind Code:
B2
Abstract:

PURPOSE: To produce a nano-crystal alloy having remarkably high relative initial permeability by rapidly solidifying a molten Fe-base alloy of specific composition, applying heat treatment to the resulting amorphous body under specific temp. conditions, and forming a microcrystalline structure.
CONSTITUTION: A molten Fe-base alloy, having a composition represented by general formula (Fe1-aMa)100-X-Y-Z-b-c-dAXM'YM"ZXbSicBd (where M means Co and/or Ni, A means Cu and/or Au, M' means one or more elements among Ti, V, Zr, Nb, Mo, Hf, Ta, and W, M" means one or more kinds among Cr, Mn, Sn, Zn, Ag, In, platinum group metals, Mg, Ca, Sr, Y, rare earth elements, N, O, and S, and 0≤a≤0.1, 0.1≤X≤3, 1≤Y≤10, 0≤Z≤10, 0≤b≤10, 11≤c≤17, and 3≤d≤10, by atomic %, are satisfied, respectively) is used. This molten alloy is rapidly solidified, and the resulting amorphous alloy is heated to a temp. not lower than the crystallization temp., held at the temp. for<5min, and cooled down to room temp. while regulating the cooling rate to ≥20°C/min until at least 400&ogr C is reached. By this method, the nano-crystal alloy containing microcrystalline grains of ≤30nm average crystalline grain size can be stably produced.


Inventors:
Katsuhito Yoshizawa
Yoshio Bizen
Shin Nakajima
Shunsuke Arakawa
Application Number:
JP18280695A
Publication Date:
December 13, 2006
Filing Date:
July 19, 1995
Export Citation:
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Assignee:
Hitachi Metals Co., Ltd.
International Classes:
C21D6/00; C22C38/00; C22C38/58; C22C45/02; H01F1/14; H01F1/153; (IPC1-7): C21D6/00; C22C38/00; C22C38/58; H01F1/14
Domestic Patent References:
JP2159315A
JP64031922A
JP1247557A