PROCESS FOR PRODUCING QUARTZ GLASS CRUCIBLE AND APPARATUS FOR PRODUCING THE QUARTZ GLASS CRUCIBLE

摘要

This invention provides a process for producing a quartz glass crucible, which does not cause significant inclusion of foreign matter during arc melting and can realize stable arc, and an apparatus for producing the quartz glass crucible. In the production process and the production apparatus, means for blowing air from the side of an arc electrode toward a melting space of a mold, and means for discharging air within a heating oven are provided. During melting, air is forcibly supplied into the melting space to render the atmospheric pressure within the melting space higher than the outside of the melting space. Preferably, an atmospheric pressure difference of not less than 100 pa is provided between the melting space and the place surrounding the melting space, and, in this state, melting is carried out.