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Follow on Google News | Selection of reducing crucible material for Rare EarthBelow we list the chemical stability of different crucible materials to rare earth metals and halides. Magnesium oxide It is relatively stable at 1200 ℃. It was used in the village of RECl3-KCl molten salt electrolyzer. Calcium Oxide Stable within 1000℃ Beryllium oxide Can be used up to 1250 ℃ High purity zirconia No higher than 1700 ℃, stable in vacuum and inert atmosphere Alumina, Silicon Oxide Reacts with molten metal at high temperatures Tantalum Metal Stable in vacuum and inert gas before 1700 ℃, but it has obvious effect with scandium and lutetium Niobium Metal 1% -2% dissolved in rare earth metal at 1500 ℃ in vacuum and inert gas paper Molybdenum Metal https://www.edgetechmat.com/ Stable before 1400 ℃ in inert gas Tungsten Metal Slowly corroded at high temperature in an inert atmosphere, but stable to halides Graphite, Carbon Slow action on rare earth metals, but stable to halides Cerium Sulfide Stable to cerium at high temperature and halide at 1000 ℃ Titanium nitride (70%) + titanium oxide (30%) More stable than cerium sulfide End
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