Heliotronic Forschungs- Und Entwicklungsgesellschaft Fur

Heliotronic Forschungs- Und Entwicklungsgesellschaft Fur Solarzellen Gmbh

Erich Bildl

Josef Dietl

Dieter Seifert

Rolf Baueregger

Erhard Sirtl

Herbert Pichler

Hermann Dicker

Rolf Bauregger

Rudolf Rothlehner

A novel material can be obtained by chemical reaction from elemental or alloyed silicon powder, to which fillers are optionally added. The novel material, which can be worked mechanically, can be further refined by means of subsequent heat treatment and/or surface coating, and can in many cases be used instead of polycrystalline or sintered silicon.

Material comprising silicon and process for its manufacture

A method for lowering the risk of contamination during comminution of solid silicon fragments produces in a first step a temperature gradient in the solid silicon fragments. This temperature gradient results from the action of heat applied from the outside. A second temperature gradient is then produced, whose direction is rapidly at least partly reversed in a second step. This treatment effects a decompacting which makes it possible to use, in a subsequent mechanical comminution step, tools whose contact surfaces are composed of silicon or of hard materials, for example, based on nitride or carbide. The product obtained is remarkable for its uniform grain size distribution and also for its high purity in fine grain size categories. In addition, the low forces required for the comminution makes possible a longer service life for the tools used.

Low-contamination method for comminuting solid silicon fragments

A process for the purification of silicon by the action of one or several acids, wherein silicon is established as a stationary phase and one or several acids are caused to form mobile phases for traversing the stationary phase under pressure and absorbing the impurities from the silicon during the passage, leaving behind the silicon with a higher degree of purity.

Process for the purification of silicon by the action of an acid

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Post Franking, Austria

Erich Bildl