MOLTEN GLASS CONVEYING EQUIPMENT ELEMENT, METHOD FOR PRODUCING MOLTEN GLASS CONVEYING EQUIPMENT ELEMENT, AND GLASS MANUFACTURING APPARATUS

摘要

The present invention relates to a method for producing a molten glass conveying equipment element having a conduit structure for molten glass containing at least one conduit comprising platinum or a platinum alloy, a first ceramic structure provided around the conduit and a second ceramic structure located around the first ceramic structure, in which a gap between the conduit and the second ceramic structure is filled with a slurry body, the slurry body is prepared by blending first stabilized zirconia particles having a median diameter D50 of 0.2 to 5 µm with second stabilized zirconia particles having a median diameter D50 of 0.2 to 2 mm in such a way that a mass ratio of the first stabilized zirconia particles to the second stabilized zirconia particles (mass of the first stabilized zirconia particles/mass of the second stabilized zirconia particles) is 0.3 to 0.6 in which each of the first stabilized zirconia particles and the second stabilized zirconia particles contain, in terms of mass% to respective entire compositions, 75 wt% or more of a zirconium oxide, and a proportion of cubic zirconia in the zirconium oxide is 80 wt% or more, and at least one of stabilizers selected from the group consisting of yttrium oxide and cerium oxide is contained in a total content of 6 to 25 wt%, and then the first ceramic structure is formed by sintering the slurry body at a temperature of 1,200 to 1,700°C.