Vacuumschmelze Gmbh & Company Kg

Georg Werner Reppel

Matthias Katter

Volker Zellmann

Markus Brunner

A composite article () comprises a plurality of inclusions () of a magnetocalorically active material embedded in a matrix () of a magnetocalorically passive material. The inclusions () and the matrix () have a microstructure characteristic of a compacted powder.

Composite article with magnetocalorically active material and method for its production

A powder composite core is to be particularly dense and strong while being produced from soft magnetic alloys. In particular, the expansion of the heat-treated core is to be avoided. To produce this core, a strip of a soft magnetic alloy is first comminuted to form particles. The particles are mixed with a first binder having a curing temperature Tand a decomposition temperature Tand a second binder having a curing temperature Tand a decomposition temperature T, wherein T&#x3c;T&#x2266;T&#x3c;T. The mix is pressed to produce a magnet core while the first binder is cured. The magnet core is then subjected to a heat treatment accompanied by the curing of the second binder at a heat treatment temperature T&#x3e;T.

Method for the production of powder composite cores and powder composite core

A method for the production of pressed permanent magnets comprises the following steps: A mixture of at least one magnetic powder and a thermosetting binder is provided and pressed to produce a moulded body. In order to obtain a permanent and particularly reliable protection against oxidation and corrosion, the moulded body is impregnated with an acid and solvent mixture in an impregnating bath before the cure of the thermosetting binder, whereby the entire surface of the permanent magnet is coated with a reaction layer [FIG.

Non-ageing permanent magnet from an alloy powder and method for the production thereof

Disclosed herein is a method for the production of an anisotropic magnetic powder or a magnet produced from said powder, wherein a hydrogenating and dehydrogenating method is applied to the starting material in order to produce the powder. An anisotropic oriented magnetic material, more particularly magnetic scrap metal, is advantageously used as starting material so that the complicated use of a molten mass with isotropic distribution of the c axes of the hard metal crystals is not required. The result is an anisotropic material having a fine grain structure and a crystallographic orientation matching a TMB phase formed during hydrogenation.

Method for the production of an anisotropic magnetic powder and a bonded anisotropic magnet produced therefrom

The invention relates to a method for producing rod-shaped permanent magnets according to which pressed parts () are produced that are then assembled to a rod-shaped green product. Said green product is subsequently sintered, whereby a rod-shaped single-piece permanent magnet () is produced.

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Hammersbach, Germany

Georg Werner Reppel