The molybdenum crucible is the main device for the smelting of rare earth metals. The corrosion of the medium and atmosphere and the severe recrystallization of the high temperature can reduce the high temperature strength, and which has an adverse effect on the life of the molybdenum crucible and the quality of the rare earth metal products.

  The continuous service life of the molybdenum crucible is 20 days.The content of molybdenum impurities in rare earth metals should be less than 0.07%. F4200J new materials based on molybdenum as the addition of rare earth oxidation and other trace elements can improve the corrosion resistance of the molybdenum crucible, improve the high temperature strength, prolong the service life of the molybdenum crucible and improve the quality of the rare earth metal products.

  Molybdenum crucible manufacturing process

  The raw materials used are molybdenum (molybdenum) powder, oxidation bowl (cerium oxide) powder and hydrogenated powder. The raw materials are prepared according to the predetermined ingredients and mixed into the mechanical mixing cylinder and mixed with 36h. It is formed on the 550 * 90mm oil lamp static press and the forming pressure is 200~220MPa. The compact is sintered in a vacuum medium frequency induction furnace and sintered at 1900~2000 C. Finally, it is processed to the finishing size.

   Prolongation of the lifetime of the molybdenum crucible - adding cerium oxide

  Grain refining and high temperature strength of molybdenum crucible are used in rare earth smelting. The weakness is high temperature strength and serious grain growth. The recrystallization temperature of pure molybdenum is 900~1000 C, and the tensile strength is 150MPa at 900 C, and decreases to 40MPa at 1200 C.

  Therefore, the pure molybdenum material is only suitable for the temperature range below 900 degrees Celsius and certain protective atmosphere. It is reported that increasing the use temperature of molybdenum can start with grain refinement and high temperature strength. More representative is the TZM alloy in the United States, the recrystallization temperature is 1300 degrees, the tensile strength is 1100 at 1100, and the temperature is 1200 at 1200.

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