EP 0921541 B1 20040506 - Fabrication process of a soft nanocrystalline magnetic core for use in a differential circuit breaker
Title (en)
Fabrication process of a soft nanocrystalline magnetic core for use in a differential circuit breaker
Title (de)
Herstellungsverfahren für einen nanokristallinen weichmagnetischen Kern für Anwendung in einem Differentialschutzschalter
Title (fr)
Procédé de fabrication d'un noyau magnétique doux nanocristallin utilisable dans un disjoncteur différentiel et noyau magnétique obtenu
Publication
Application
Priority
FR 9715273 A 19971204
Abstract (en)
[origin: EP0921541A1] Production of a nanocrystalline soft magnetic iron-silicon-boron alloy magnetic core involves crystallization heat treatment of the amorphous alloy at 250-450 degrees C in a transverse magnetic field of rectangular waveform. Production of a magnetic core of nanocrystalline soft magnetic alloy, of composition more than 60 at.% Fe, 10-20 at.% Si, 0.1-2 at.% Cu, 5-20 at.% B and 0.1-10 at.% of one or more of Ti, Nb, Zr, Hf, V, Ta, Cr, Mo, W and Mn, the sum of Si + B being less than 30 at.%, involves crystallization heat treatment of the amorphous alloy at 250-450 degrees C in a transverse magnetic field of rectangular waveform. An Independent claim is also included for a magnetic core produced by the above process and exhibiting, for a 50 Hz alternating excitation magnetic field of 10 mA/cm maximum amplitude at 25 degrees C, an impedance magnetic permeability ( mu z) of greater than 200000, a remnant induction/saturation induction (Br/Bm) ratio of less than 0.2 and DELTA Bstat and DELTA Bdyn values of greater than 0.2 T.
IPC 1-7
IPC 8 full level
H01F 1/153 (2006.01); H01F 41/02 (2006.01); H01H 83/14 (2006.01)
CPC (source: EP)
H01F 1/15333 (2013.01); H01F 1/15341 (2013.01); H01F 41/0226 (2013.01); H01H 83/144 (2013.01)
Designated contracting state (EPC)
AT DE ES FR IT NL
DOCDB simple family (publication)
EP 0921541 A1 19990609; EP 0921541 B1 20040506; AT E266245 T1 20040515; DE 69823621 D1 20040609; DE 69823621 T2 20050519; FR 2772181 A1 19990611; FR 2772181 B1 20000114; PL 186806 B1 20040227; PL 330101 A1 19990607
DOCDB simple family (application)
EP 98402804 A 19981113; AT 98402804 T 19981113; DE 69823621 T 19981113; FR 9715273 A 19971204; PL 33010198 A 19981204