| 摘要 |
PROBLEM TO BE SOLVED: To provide a stirrer for glass melting that can be used for a long period of service life while maintaining high strength even in an environment exposed to a high-temperature oxygen-containing gas atmosphere for a long time, and can suppress bubbles from being mixed into a glass molten liquid.SOLUTION: A stirrer for glass melting is made of iridium or an iridium-based alloy, and includes a rotary shaft 11 and a stirring part 12. A surface region S1 of the surface of the rotary shaft 11 above the stirring part 12 is covered with a cylindrical cover 20. The cover 20 has a two-layer structure in which an outside layer comprising platinum or a platinum-rhodium alloy and an inside layer comprising platinum or a platinum-rhodium alloy containing metal species are bonded to each other. Oxide particles of the metal species are deposited in a dispersed state on a surface of the inside layer on the side opposite to a surface contacting with the outside layer. The stirrer for glass melting has a pipe 30 that is made of iridium or an iridium-based alloy and surrounds at least a surface region S2 of the cover 20 extending from a lower end of the cover 20 to a predetermined height with a space therebetween. |
