LINING FOR SURFACES OF A REFRACTORY CRUCIBLE FOR PURIFICATION OF SILICON MELT AND METHOD OF PURIFICATION OF THE SILICON MELT USING THAT CRUCIBLES FOR MELTING AND FURTHER DIRECTIONAL SOLIDIFICATION

摘要

The crucible for molten silicon comprises at least one refractory material having an inner surface and a lining deposited on the inner surface, wherein the lining comprises colloidal silica. The silicon refining method comprises melting a first silicon inside a melting crucible to provide a first molten silicon, the melting crucible comprising a first refractory material having at least one first inner surface defining the interior of the melting crucible And directionally solidifying the first molten silicon in a directional solidified mold to provide a second silicon, wherein the directional solidified mold is a second refractory having at least one second inner surface defining an interior of the mold, And coating at least a portion of at least one of the first inner surface and the second inner surface with a lining comprising colloidal silica.;