An alloy whose substrate is iridium containing other elements. It is a kind of precious metal material with special purpose. Iridium alloy has high melting point, high chemical stability and good thermal strength. But most iridium alloys are brittle and difficult to process, limiting their use. Common iridium alloys include ir-40rh, ir-70rh, ir-20ru and ir-10ru. Common iridium alloys include ir-40rh, ir-70rh, ir-20ru and ir-10ru. Iridium alloy is mainly used as high temperature oxidation resistance thermocouple and electrical contact materials, the use of Ir - Rh in thermocouple temperature can be as high as above 2000 ℃. Iridium alloy can be used to improve the processing performance of iridium with a small amount of tungsten or hafnium, and the addition of trace amounts of aluminum, iron, thorium and so on to improve the impact toughness. As a result, iridium alloy has high melting point and high temperature strength, good thermal shock resistance, and is compatible with graphite and PuO2 at high temperature. It is selected as the nuclear fuel container material for aerospace and medical applications.
Iridium and it is used to grow high melting point alloy crucible oxide crystals, it can work in 2100 ~ 2200 ℃ for long and don't react with oxide materials. To save precious metals and reduce the cost of crystal growth, several composite crucibles have been developed, that is, a certain thickness of iridium or iridium alloy layer has been formed on the refractory metal molybdenum, tantalum and tungsten crucibles. These crucibles have a limited service life and are mostly used at lower temperatures.
