SU398348A1 - METHOD OF OBTAINING MULTILAYER MAGNETIC - Google Patents

Description

one

The invention relates to the field of powder metallurgy, in particular to the production of multilayer magnetic materials by pressing, rolling and annealing, and can be used in the electrical industry to produce magnetic materials with special properties.

There is a known method of producing multilayer materials by rolling a stack of metal tape packages with intermediate repeated sintering and final annealing.

In order to increase the plasticity and homogeneity of the thickness of the ferromagnetic and diamagnetic layers according to the proposed method, a package of layers of metal foils is precompressed with compression in 15-20%, is sintered in vacuum at 850-900 ° C for 1-2 hours, re-pressed with a degree of reduction of 40-50% and the second sintering at the specified above mode, then the obtained MANY. LAYER material is subjected to alternating rolling and annealing in vacuum.

MA.GNIT.NY MNO.GOLOSYNYY material, n.ppremer, foil steel 08KP and copper brand Ml receive the proposed method as follows.

Foil of steel and copper with a thickness of 0.1 mm is cut into ribbons laid out on 30X30 squares, degreased, cut, peeled, and folded. In a package with 200 layers of layers, alternating layers of copper and steel. The package is wrapped in a steel foil and placed in a clamp, in which pressing with a degree of 15-20% is carried out, the sprubtsina nuts are tightened before relieving the load. Together with the clamp, the bag is sintered in a vacuum of 10 torr, at 850–900 ° C

iB for 1-2 hours 1 After sintering, the bag is removed from the clamp and re-pressed on a press with a reduction ratio of 40-50%, then re-sintering according to the above regime. The sintered package is subjected to deformation on rollers with a compression in a single pass of 65-70% at a speed of 20-30 m1 sec, after which annealing in a torr vacuum at 600 ° C for 1-1.5 hours is carried out.

By alternating rolling and annealing, the package thickness is adjusted to 0.2-0.3 mm. The surface of the package is enclosed, for example, by electroplating with a layer of copper with a thickness of 1-2 μm, cut into 30X30 squares, peen, assembled into a package

from 60 plates and with the above modes, a multilayer magnetic material is obtained with a thickness of from 0.12 to 1.2 mm with a number of layers of 12000. The thickness of the ferromagnetic layer ranges from 0.015 µm to 0.1 µm. The resulting multilayer magnetic material has

tensile strength АВ 125-135 kg / mm, coercive force Yas "ah 40-45 e, residual magnetic induction Вг 6800-7200 gauss.

PREd. M et and z about b, rec e "and

A method of producing multi-layer magnetic materials, for example, based on iron, which includes rolling of stacked B stack of layers with a degree compressed and 50-70% and intermediate anneals, characterized in that.

in order to increase the plasticity and uniformity of 1PO ferromagnetic and diamagnetic thicknesses, the package of layers of metal foils is pre-pressed with compression in 16-20%, sintered in vacuum at 850-900 ° C for 1-2 hours, re-pressed with reduction degree 40 -50% and is secondarily sintered in the above regime, then the obtained multilayer material is subjected to alternating rolling and annealing operations in vacuum.