Umicore Ag & Co Kg

Abb Technology Ag

Georg Ptaschek

Dietmar Gentsch

Calogero Di Vincenzo

Bernd Kempf

Hans-Martin Ringelstein

Roland Fuchs

Calogero DiVicenzo

Di Vincenzo Calogero Calogero

Energy-saving lamps contain a gas filling of mercury vapor and argon in a gas discharge bulb. Amalgam spheres are used for filling the gas discharge bulb with mercury. A tin amalgam having a high proportion by weight of mercury in the range from 30 to 70% by weight is proposed. Owing to the high mercury content, the amalgam spheres have liquid amalgam phases on the surface. Coating of the spheres with a tin or tin alloy powder converts the liquid amalgam phases on the surface into a solid amalgam having a high tin content. This prevents conglutination of the amalgam spheres during storage and processing.

Amalgam spheres for energy-saving lamps and their production

Amalgam spheres for energy-saving lamps and the manufacture thereof

The invention relates to an annular disc of bent sheet material () with at least one junction at which the annulus is closed. Furthermore, a method for producing an annular disc is disclosed, comprising the steps of: (a) providing a sheet material; (b) bending the sheet material into an annular disc; (c) severing the sheet material, so that an annular disc with a junction at which the annulus is open is provided; (d) closing the junction, so that an annular disc with a junction at which the annulus is closed is provided. A description is given of a method for producing an annular disc comprising the steps of: (i) providing a sheet material; (ii) bending the sheet material into a first part of an annular disc; (iii) severing the sheet material, so that a first part of an annular disc is provided; (iv) repeating steps (i), (ii) and (iii) at least once, so that at least one further part of the annular disc is provided; and (v) connecting the first part and the further parts of the annular disc, so that an annular disc with at least two junctions at which the annulus is closed is provided.

Annular disc of bent sheet material

A method for producing an arc-erosion resistant coating provides a substrate material with an arc-erosion resistant layer by a cold-gas spraying method. The method can be used for producing an arc-erosion resistant coating in inner regions of vacuum interrupter chambers that are exposed to electric arcs. An exemplary vacuum interrupter chamber with a shield coated inside is disclosed for medium-voltage switchgear.

Method of producing an arc-erosion resistant coating and corresponding shield for vacuum interrupter chambers

The invention relates to a process and a device () for the production of spherical metal particles () from a melt (). In order to produce droplets a melt jet () is subjected to vibrations and is led through at least one nozzle (). In order to produce spherical metal particles () the droplets at the outlet of the nozzle () are fed to a coolant () for purposes of consolidation. The nozzle () dips into the coolant (), the temperature of the coolant () being below the melting point of the melt ().

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Melbach, Germany

Georg Ptaschek