Conduit for glass melt, container for glass melt, manufacturing method thereof, glass article manufacturing apparatus, and glass article manufacturing method

摘要

According to the present invention, a coating film is formed on at least a part of the inner surface of a hollow pipe made of platinum or a platinum alloy by the thermal spraying satisfying the following conditions (1) to (4), and then the coating film is subjected to heat treatment at 1,300 to 1,800 C. oxygen A method for producing a glass melt conduit or glass melt container to be exposed to a containing atmosphere:(1) the average film thickness of the film is 0.1 to 0.5 mm;(2) In forming the coating film, a raw material containing a platinum alloy and at least one element selected from the group consisting of zirconium (Zr) and yttrium (Y) is used;(3) The platinum alloy of (2) comprises at least platinum (Pt) and at least one selected from the group consisting of rhodium (Rh), iridium (Ir), gold (Au), palladium (Pd), and ruthenium (Ru) One element and the total content of elements other than platinum is from 5 to 40 mass% with respect to the total mass of the platinum alloy;(4) The total content of elements other than the platinum alloy in the raw material of (2) is 0.05 to 3 mass% with respect to the total mass of the platinum alloy.