Method of producing a strip of nanocrystalline material and device for producing a wound core from said strip

Abstract

The invention relates to a method of producing a strip of nanocrystalline material which is obtained from a wound ribbon that is cast in an amorphous state, having atomic composition [Fe1-a-bCoaNib]100-x-y-2-alpha-beta-gamma Cu<x>Si<y>BzNbalphaM'betaM''gamma, M' being at least one of elements V, Cr, Al and Zn, and M being at least one of elements C, Ge, P, Ga, Sb, In and Be, with: a <= 0.07 and b = 0.1, 0.5 <= x <=1.5 and 2 <= a <= 5, 10 <= y <= 16.9 and 5 <= z <= 8, beta <= 2 and gamma <= 2. According to the invention, the amorphous ribbon is subjected to crystallisation annealing, in which the ribbon undergoes annealing in the unwound state, passing through at least two S-shaped blocks under voltage along an essentially longitudinal axial direction of the ribbon, such that the ribbon is maintained at an annealing temperature of between 530 DEG C and 700 DEG C for between 5 and 120 seconds and under axial tensile stress of between 2 and 1000 Mpa. The tensile stress applied to the amorphous ribbon, the displacement speed of the ribbon during annealing and the annealing time and temperature are all selected such that the cross-section profile of the strip is not in the form of Omega and the maximum deflection of the cross-section of the strip is less than 3% of the width of the strip and preferably less than 1% of the width. The invention also relates to the strip and the core thus obtained and to the device used to implement the method.

Description

Technical field [0001] The present invention relates to a method for producing a strip of nanocrystalline material, a device for producing a tore enroulé from the strip, and the core and the element combining them. Background technique [0002] In particular, the patent FR2823507 discloses the production of nanocrystalline material cores with low permeability (μ≤1000) from FeCuNbSiB type amorphous ribbons transformed by annealing. [0003] This document specifically describes the stress annealing method of these amorphous ribbons, which significantly reduces the ultimate brittleness of nanocrystalline materials, which previously could not be processed in the form of cores after nanocrystallization. The mechanical properties that can be obtained by this stress annealing method enable the winding of the strip without the risk of breaking, and also enable the uncoiling and rewinding of the strip while still maintaining the same reel. [0004] These improved mechanical properties are...

AI Technical Summary

Problems solved by technology

Therefore, in production, either the ribbon must be integrated with the protrusions of the omega on the outside of the core being produced, which requires additional control and a more complex process; or the yield will be reduced and the performance will be uneven

[0006] Also during the automatic winding to get the core the tape head can be very difficult to pick up and stick to the reel because this omega profile prevents the tape head from being picked up well and sticking due to this decompression phenomenon

[0007] And it has been found that the more the permeability of the strip is increased, the more brittle it is in its final state and the greater its rate of fracture becomes

It is therefore impossible to industrially produce nanocrystalline ribbons with this method, especially when their magnetic permeability exceeds 1000

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