Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Tobias Naumann

Steffen Nowotny

Siegfried Scharek

Lutz-Michael Berger

Andreas Schmidt

Friedrich Kempe

Stefan Langner

Filofteia-Laura Toma

Carl Christoph Stahr

Filotheia-Laura Toma

The disclosure provides a method of producing thermally sprayed AlOcoatings having a high content of corundum without any property-reducing additives. The coatings may be utilized particularly in the field of electrical insulation, as a dielectric, and as protection from wear. The thermally sprayed AlOcoatings have a porosity of no more than 19%, and a high content of &#x3b1;-AlO(content of corundum) of at least 72% by volume. The coatings have a specific electrical resistance of &#x3e;1&#xb7;10Ohms&#xb7;cm, and a purity of &#x3e;97%. The production of said coatings is carried out utilizing aqueous or alcoholic suspensions made from substantially pure &#x3b1;-AlO, having a grain size of &#x3e;100 nm by thermal spraying.

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The invention relates to a machining head with integrated powder supply for deposition welding using laser radiation. A machining head in accordance with the invention can in particular be used for deposition welding at a high deposition rate. In the machining head in accordance with the invention, the laser radiation is directed to supplied powder and to a material surface with a focal spot. The powder supply takes place symmetrically to the axial feed direction with a plurality of channels arranged oppositely. The channels are aligned at an obliquely inclined angle so that powder discharged from them is supplied into the focal spot of the laser radiation from two mutually oppositely disposed sides over the total width of the focal spot with respect to the axial feed direction.

Machining head with integrated powder supply for deposition welding using laser radiation

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Dresden, Germany

Tobias Naumann