Title:
NANO-CRYSTAL ALLOY EXCELLENT IN PULSE DECAY CHARACTERISTIC, CHOKING COIL, NOISE FILTER USING SAME, AND THEIR PRODUCTION
Document Type and Number:
Japanese Patent JP3233313
Kind Code:
B2
Abstract:
PURPOSE: To produce a nano-crystal allay excellent in pulse decay characteristic by heat-treating an amorphous alloy foil and forming a fine crystal grain structure which is composed essentially of bcc phase and partially contains Fe-B compound phase and has specific magnetic flux density.
CONSTITUTION: An amorphous alloy foil is prepared by means of liquisol quenching. It is preferable that the above alloy has a composition represented, e.g. b (Fe1-aMa)100-x-y-z-αAxSiyBzM'α (atomic%) (where M means Co and Ni, A means Cu and Au, M' means Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, and Mn, 0≤a≤0.3, 0≤x≤3, 0≤y≤20, 2≤z≤15, and 0.1≤α≤10). The above amorphous alloy foil is held at a temp. not lower than the initial crystallization temp. for 5min to 100hr. By this heat treatment, a structure where crystalline grains of ≤50nm grain size comprise at least 50% is formed. Moreover, these crystalline grains are composed essentially of bcc phase and partially contain Fe-B compound phase, and saturation magnetic flux density and residual magnetic flux density are regulated ≥1T and ≤0.4T, respectively.
Inventors:
Katsuhito Yoshizawa
Bizen Yoshio
Shunsuke Arakawa
Bizen Yoshio
Shunsuke Arakawa
Application Number:
JP17953593A
Publication Date:
November 26, 2001
Filing Date:
July 21, 1993
Export Citation:
Assignee:
Hitachi Metals Co., Ltd.
International Classes:
C22C38/00; C21D6/00; C22C33/04; C22C45/02; H01F1/14; H01F1/153; H01F3/04; H01F19/00; H01F37/00; (IPC1-7): C21D6/00; C22C33/04; C22C38/00; C22C45/02; H01F1/14; H01F19/00
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