METHOD FOR MANUFACTURING SILICA GLASS CRUCIBLE, AND APPARATUS FOR MANUFACTURING VITREOUS SILICA CRUCIBLE

摘要

PROBLEM TO BE SOLVED: To accurately measure temperature during manufacturing a silica glass crucible.

SOLUTION: There is provided an apparatus for manufacturing a vitreous silica crucible, in which silica powder is supplied into a mold for molding a crucible to form a silica powder layer and the silica powder layer is heated and fused by arc discharge, and the apparatus includes: a mold to which the silica powder is supplied to form the silica powder layer; an arc discharge unit having a plurality of carbon electrodes and a power supply unit; and a temperature measuring unit for measuring temperature in at least a fused portion in the mold. The temperature measuring unit is a radiation thermometer for measuring temperature by detecting radiation energy at a wavelength of 4.8 to 5.2 μm.

COPYRIGHT: (C)2012,JPO&INPIT