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Mosten Alloy Co., Ltd.

Rare earth Molybdenum

  • Mosten
  • 2 Sept

Molybdenum _ 2O _ 3 was reduced to Molybdenum _ 2O _ 2 in hydrogen at 550 ℃, and 0.2% (mass fraction) rare earth oxide solution was added to each part of Molybdenum _ 2O _ 2. Molybdenum _ 2O _ 2 and pure Molybdenum _ 2 mixed with rare earth were reduced to Molybdenum powder in hydrogen at about 1100 ℃. Then it was pressed by 300 MPa and sintered in hydrogen at 1 800 ℃ for 10 h. The difference between rare earth Molybdenum wire and pure Molybdenum wire is that the recrystallizing temperature of rare earth Molybdenum wire is between 1 500 ℃ and 1 600 ℃, while that of pure Molybdenum wire is 1 000 ≤ 1 200 ℃. The metallographic structure of rare earth Molybdenum wire or pure Molybdenum wire before recrystallizing temperature is fibrillar structure. The metallographic structure of rare earth Molybdenum wire forms a large chain lap grain structure, while the pure Molybdenum wire forms an isometric crystal structure of varying size after recrystallizing. The metallographic structure of rare earth Molybdenum wire or pure Molybdenum wire is fibrillar structure, and the metallographic structure of rare earth Molybdenum wire is large chain lap grain structure. When the deformation is 99.9%, the pure Molybdenum wire can not see the particle arrangement on SEM after annealing at l 800 ℃, while the five kinds of rare earth Molybdenum wire can see a large number of particle arrangement, especially the particle streamline with very small diameter in the sample containing Nd2O3. Compared with this, the sample with Y2O3 and Gd2O3 shows that the diameter of the sample is much larger than that of the material added to Sm2O3,La2O3,Nd2O3. Doping different elements has great influence on the recrystallizing temperature and creep resistance of Molybdenum wire at high temperature. Rare earth Molybdenum wire shows higher recrystallizing temperature and smaller deformation than pure wire. Because the intersection of grain boundary and wire axis is less, the creep deformation caused by grain boundary slip and separation is the smallest at high temperature, so it has good high temperature performance. After high temperature treatment above 1100 ℃, pure Molybdenum wire will make the particles thick and brittle, thus reducing its high temperature strength, or tensile strength, hardness and bending strength. If the mass of cerium oxide powder with the mass of 0.05% ≤ 6.0% is the same as that of Molybdenum, the crystallization of cerium oxide powder with the same melting point as Molybdenum also changes due to the change of microstructure. When the mass is 0.1% ≤ 0.3%, the recrystallizing temperature is above 1 600 ℃, and when 1.0% is added, the recrystallizing temperature is above 1800 ℃. Cerium oxide is uniformly dispersed and arranged neatly in Molybdenum, which improves the effect of controlling grain size. If the content of cerium oxide is more than 3.0%, the processing performance of the material becomes worse and the yield becomes lower, and when the content of cerium oxide is less than 0.1%, the recrystallizing temperature is below 1500 ℃.

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molybdenum