Heraeus Quarzglas Gmbh & Co Kg

Solarworld Innovations Gmbh

Nils-Christian Nielsen

Christian Schenk

Gerrit Scheich

Walter Lehmann

Bernhard Freudenberg

Kaspars Dadzis

Gerd Fischer

Sandra Nadolny

Franziska Wolny

A method for producing a solar crucible includes providing a crucible base body of transparent or opaque fused silica having an inner wall, providing a dispersion containing amorphous SiOparticles, applying a SiO-containing slip layer to at least a part of the inner wall by using the dispersion, drying the slip layer to form a SiO-containing grain layer and thermally densifying the SiO-containing grain layer to form a diffusion barrier layer. The dispersion contains a dispersion liquid and amorphous SiOparticles that form a coarse fraction and a fine fraction with SiOnanoparticles. The weight percentage of the SiOnanoparticles based on the solids content of the dispersion is in the range between 2 and 15% by weight. The SiO-containing grain layer is thermally densified into the diffusion barrier layer through the heating up of the silicon in the crystal growing process.

Silicon block, method for producing the same, crucible of transparent or opaque fused silica suited for performing the method, and method for the production thereof

A method for producing a coated component consisting of transparent or opaque fused silica comprises a method step in which a SiOgranulation layer is applied to a coating surface of a substrate, which in the area of the free surface has a relatively great granulation fine fraction. Starting from this, in order to achieve a smooth, preferably also dense surface layer, it is suggested according to the invention that the application of the SiOgranulation layer comprises (i) providing a dispersion containing a dispersion liquid and amorphous SiOparticles which form a coarse fraction with particle sizes ranging between 1 &#x3bc;m and 50 &#x3bc;m and a fine fraction of SiOnanoparticles having particle sizes of less than 100 nm, wherein the solids content of the dispersion is between 70 and 80 wt.-%, and of which between 2 wt.-% and 15 wt.-% are the SiOnanoparticles, (ii) applying the dispersion to the coating surface by casting or spraying it thereonto so as to form a slurry layer having a layer thickness of at least 0.3 mm; and (iii) drying the slurry layer by removing the dispersion liquid at a rate and in a direction such that under the action of the dispersion liquid being removed the fine fraction is enriched in the outer portion of the granulation layer, thereby forming a casting skin.

Method for producing a coated component of transparent or opaque fused silica

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Schlangenbad, Germany

Nils-Christian Nielsen