Curvature-reduction annealing of amorphous metal alloy ribbon

Details Curvature-reduction annealing of amorphous metal alloy ribbon Curvature-reduction annealing of amorphous metal alloy ribbon

C - Chemistry, Metallurgy

21

D

C21D 8/12 (2006.01) G08B 13/24 (2006.01)

Patent

CA 2231000

A longitudinal curvature in an amorphous metal alloy ribbon (32) is reduced by heat-treatment. While the heat-treatment occurs, the alloy ribbon (32) is bent "backwards" against the longitudinal curvature, to reduce the amount of heat- treatment required. The process is carried out continuously by transporting the alloy ribbon (32) from reel (36) to reel (38), while wrapping the ribbon (32) around a heated roller (34). Using a discrete strip cut from the alloy ribbon (32) subjected to the curvature-reducing process, a magnetomechanical EAS marker (24') is constructed that has a relatively low profile, while retaining desired magnetic properties.

La courbure longitudinale d'un ruban d'alliage métallique amorphe (32) est réduite par traitement thermique. Durant celui-ci, on replie le ruban d'alliage (32) "vers l'arrière" contre la courbure longitudinale de façon à diminuer le traitement thermique nécessaire. Le traitement en continu consiste à faire passer le ruban d'alliage (32) d'une roue (36) à l'autre (38) tout en l'enroulant autour d'un cylindre chauffé (34). A l'aide d'un bande discrète découpée dans le ruban (32) soumis au processus de réduction de courbure, on fabrique un marqueur magnétomécanique pour système électronique de surveillance d'articles (24') qui présente un profil relativement bas tout en conservant les propriétés magnétiques désirées.

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