MOLTEN GLASS HOLDING REFRACTORY, GLASS MANUFACTURING APPARATUS USING MOLTEN GLASS HOLDING REFRACTORY AND METHOD FOR MANUFACTURING GLASS USING GLASS MANUFACTURING APPARATUS

摘要

The present invention relates to a refractory for holding a molten glass in which a surface thereof contacting a molten glass is coated with platinum or a platinum alloy containing from 5 to 20% of rhodium or iridium, and the platinum coating or the platinum alloy coating is further coated with a ceramic material, in which the refractory contains at least one of an aluminum oxide and a zirconium oxide in a total content of from 50 to 98% by mass, and a remainder thereof contains a silicon oxide, the platinum coating or the platinum alloy coating has a thickness of from 0.05 to 0.5 mm, the ceramic material contains from 80 to 95% by mass of a zirconium oxide, and a remainder thereof contains at least one selected from a yttrium oxide, an erbinium oxide and a cerium oxide, the ceramic material coating has a thickness of 0.1 mm or more, and the ceramic material coating has a porosity of from 5 to 20%.