Patent ID: 10858276

Abstract:
A stirrer for glass melting which can be used over a prolonged life expectancy, while maintaining a high strength, even in an environment exposed to a high temperature and an oxygen-containing gas atmosphere for a long period of time, and can prevent the air bubbles from being mixed into the glass melt. A stirrer for glass melting is made of iridium or an iridium-based alloy, and has a rotary shaft and a stirring part, a surface region S1 of the surface of the rotary shaft above the stirring part is covered with a cylindrical cover, the cover has a two-layer structure in which an outer layer made of platinum or a platinum rhodium alloy and an inner layer made of platinum or a platinum rhodium alloy containing metal species are joined together, and oxide particles of metal species are precipitated in a dispersed state on a surface of the inner layer on an opposite side to a surface adjacent to the outer layer, wherein the stirrer for glass melting has a pipe made of iridium or an iridium-based alloy which surrounds at least the surface region S2 of the cover from the lower end of the cover to a predetermined height at an interval.