METHOD AND APPARATUS FOR MANUFACTURING QUARTZ GLASS CRUCIBLE

摘要

Provided is a method for manufacturing a quartz glass crucible by employing a rotating molding method. The method is characterized in performing arc-melting by arranging an electrode at a position deviated from a molding center line. The eccentric arc controls glass temperature differences among the temperatures of glass being melted at a straight trunk portion, a curved portion and a bottom portion to be 300°C or below. The eccentric arc also controls the thicknesses of a transparent layer at the straight trunk portion and at the bottom portion to be within 70-120% of the thickness of the transparent layer at the curved portion.