Analysis of Failure Cause of Molybdenum Crucible for Rare Earth Smelting
In order to clarify the cause of perforation in a molybdenum crucible used for rare earth smelting of a cer-tain specification,macroscopic morphology analysis,chemical composition analysis and corrosion analysis were con-ducted on the failed molybdenum crucible samples.The results show that the main cause of the crucible perforation is the serious corrosion of molybdenum caused by lithium in lithium fluoride molten salt,which proves that the cru-cible wall at the approximate horizontal section where the perforation is located is seriously corroded,and the perfo-ration is not a special defect.The approximate horizontal section where the perforation is located is the thinnest and has the most severe corrosion.
rare earthmolybdenum crucibleperforatecorrosionlithium molten salt