APPARATUS AND METHOD FOR PRODUCTION OF HIGH-MELTING POINT GLASS MATERIAL OR HIGH-MELTING POINT GLASS CERAMIC MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a method and an apparatus for production of high-melting point glass materials or high-melting point glass ceramic materials by a process during which a temperature of a molten mass exceeds 1,760°C, wherein a shard material or raw material is melted to a molten mass, and the molten mass emerges via a tubular outlet (4) made of iridium or an iridium alloy having the iridium content of at least 50 wt.%.;SOLUTION: The temperature of a section of the tubular outlet (4), which is in contact with the ambient atmosphere having a natural gas composition, is controlled or regulated such that the temperature is always below 1,000°C except during pouring out the molten mass out of the tubular outlet. Thus, an oxidative decomposition of the apparatus can be prevented.;COPYRIGHT: (C)2009,JPO&INPIT