Vacuumschmelze Gmbh & Company Kg

Vacuumschmelze Gmbh

Harald Staubach

Markus Brunner

Joachim Gerster

Lothar Zapf

Witold Pieper

Dominik Fackelmann

A method for joining core laminations by adhesive force to form a soft-magnetic laminated core by applying a coating that is wettable with epoxy resin to top sides and undersides of each sheet. The sheets are separated into core laminations made of soft-magnetic sheets, which are stacked to form a core lamination stack, and a cured adhesive introduced in a state of low viscosity into interstices between the core laminations. The core lamination stack has intermediate layers between the core laminations. For this purpose, the core laminations comprise a final-annealed, crystalline CoFe alloy, an adhesive-wettable top side and an adhesive-wettable underside. Together with the intermediate layers, the core laminations form a dimensionally accurate laminated core. The laminated core has a substantially adhesive-free contour consisting of contour surfaces of the core laminations. The adhesive is solvent-free in its low-viscosity state.

Method for joining core laminations by adhesive force to form a soft-magnetic laminated core

The invention relates to a method for producing a sintered material offering improved corrosion protection by activation and coating of the surface with a metal, followed by a heat treatment. Said method is characterized in that during activation and before coating with said metal the following steps are carried out: removal of particles adhering to the surface of the sintered material by treating said surface with a stripper; passivation of the surface; and drying of the sintered material. The invention also relates to a magnetic body with greater corrosion resistance.

Method for improving the corrosion protection of permanent magnets containing rare earth metals

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Alzenau, Germany

Harald Staubach