Stirrer for glass melting, and glass melting furnace
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United States of America Patent
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Dec 8, 2020
Grant Date -
May 18, 2017
app pub date -
Apr 8, 2015
filing date -
Apr 11, 2014
priority date (Note) -
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status (Latency Note)
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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.
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