Manufacturing method of large-size and high-density bright iridium crucible

Abstract

The invention provides a manufacturing method of a large-size and high-density bright iridium crucible. The manufacturing method comprises the following steps that high-purity iridium powder is pressed and smelted into an iridium block, the iridium block is put into a heat-resistant ceramic crucible and a vacuum medium-frequency induction furnace for smelting, the vacuum medium-frequency inductionfurnace is vacuumized, then is filled with argon, the iridium block is heated to a complete melting state, then iridium liquid is slowly condensed, and an iridium ingot is taken out after repeating for at least 4 times; the iridium ingot with a thickness of about 20 mm is forged; the iridium ingot is heated, then is put on a rolling mill for hot rolling, two channels are rolled by heating for onetime, and the two pushing rates decrease sequentially; an obtained iridium plate is correspondingly cut out of the crucible bottom and the crucible body; the crucible body is subjected to edge rolling by an edge rolling machine made of nickel-based superalloy from the working part of the edge rolling machine; acid pickling is conducted; welding is conducted; and trimming, impurity removing and brightening are conducted. Therefore, the prepared iridium crucible is large in density, uniform in thickness and bright in surface, bubbling can be avoided in high-temperature use, and the service lifeis long.

Description

technical field [0001] The invention belongs to the technical field of manufacturing difficult-to-shape precious metals, and in particular relates to a method for manufacturing a large-size, high-density bright iridium crucible. Background technique [0002] Iridium is a kind of high melting point (2410±40℃) and high density (22.562±0.011g / cm 3 ), stable chemical properties, high temperature oxidation resistance of noble metals. In the high melting point laser single crystal yttrium aluminum garnet (YAG), germanium gallium garnet (GGG), wide bandgap semiconductor gallium nitride, gallium oxide, scintillation crystal (LYSO), etc. are mainly used in the laser and electronic industries, and the demand is very high. Large, these high-melting point single crystals are generally produced by the Czochralski method, but currently only iridium crucibles can meet the harsh high-temperature production conditions, so the practical value and market prospects of iridium crucibles are sel...

AI Technical Summary

Problems solved by technology

[0005] The present invention is carried out in order to solve the above-mentioned problems, and the purpose is to provide a kind of iridium crucible which can solve the problems of low density, uneven wall thickness and traditional plate forming method, such as rough surface, coarse crystal grain and gray color, which are manufactured by traditional casting method. Manufacturing method of large-size high-density bright iridium crucible for producing iridium crucible with high density, uniform wall thickness and bright and smooth surface