METHOD FOR PRODUCING A QUARTZ GLASS CRUCIBLE HAVING A TRANSPARENT INNER LAYER MADE OF SYNTHETICALLY PRODUCED QUARTZ GLASS

摘要

The aim of the invention is to provide a method for producing a quartz glass crucible which has an inner layer made of transparent, low-void and pure quartz glass and a long service life. Said aim is achieved according to the invention by a method comprising the following steps: (a) providing a crucible main body made of quartz glass having an inner face, (b) generating a porous SiO₂ soot layer on at least a portion of the inner face of the crucible main body by means of chemical vapor deposition, drying the porous SiO₂ soot layer in order to reduce the hydroxyl group content, and sintering the soot layer to the inner layer made of transparent quartz glass in a low-hydrogen atmosphere, such that a hydroxyl group content of less than 100 ppm by weight develops in the quartz glass of the inner layer.