METHOD FOR PREPARING A SILICON BLOCK, MOULD MADE OF QUARTZ GLASS OR QUARTZ SUITABLE FOR THAT METHOD, AND METHOD FOR THE PREPARATION OF SAME

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 SiO2 particles, applying a SiO2-containing slip layer to at least a part of the inner wall by using the dispersion,...

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Bibliographische Detailangaben
Hauptverfasser: Lehmann, Walter, Freudenberg, Bernhard, Wolny, Franziska, Dadzis, Kaspars, Schenk, Christian, Fischer, Gerd, Scheich, Gerrit, Nielsen, Nils-Christian, Nadolny, Sandra
Format: Patent
Sprache:eng ; fre ; ger
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Zusammenfassung: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 SiO2 particles, applying a SiO2-containing slip layer to at least a part of the inner wall by using the dispersion, drying the slip layer to form a SiO2-containing grain layer and thermally densifying the SiO2-containing grain layer to form a diffusion barrier layer. The dispersion contains a dispersion liquid and amorphous SiO2 particles that form a coarse fraction and a fine fraction with SiO2 nanoparticles. The weight percentage of the SiO2 nanoparticles based on the solids content of the dispersion is in the range between 2 and 15% by weight. The SiO2-containing grain layer is thermally densified into the diffusion barrier layer through the heating up of the silicon in the crystal growing process.