Molybdenum lanthanum alloy and TZM alloy high temperature molybdenum development
Molybdenum lanthanum molybdenum alloy, also known as high temperature molybdenum, grade MoLa, is doped by a small amount of lanthanum trioxide (La2O3) particles can form the so-called composite fiber structure. This particular microstructure is stable even at temperatures up to 2000 ° C. Therefore, molybdenum - lanthanum oxide has creep resistance even under service conditions. We mainly process this molybdenum alloy into high temperature furnace parts, such as vacuum furnace heat shield, sintering and annealing boat, strand or evaporator coil.
The advantages of lanthanum molybdenum alloy: higher recrystallization temperature; Elongated particle structure to improve ductility; Stronger oxidation resistance; Higher creep resistance. Recrystallization temperature: 1400℃~1500℃. Resistivity of lanthanum molybdenum alloy (unit: ω *mm2/m).
The lanthanum molybdenum alloy Mo-La alloy is an alloy consisting of the matrix metal molybdenum and the lanthanum trioxide present as a dispersing particle in the matrix. The content of La2O3 in the alloy is generally 0.5%~5.0%(mass fraction).
Molybdenum has excellent high temperature strength, creep resistance, low coefficient of thermal expansion, good thermal conductivity and corrosion resistance, so it is widely used in the electronic industry, aviation and military fields. However, molybdenum has a low recrystallization temperature, so the use of pure molybdenum is often limited. The recrystallization temperature of molybdenum is about 1000℃. Once the recrystallization of molybdenum occurs, the harmful impurity elements are easy to be enriched on the grain boundary, thus reducing the high temperature and room temperature properties of molybdenum. As with other metals, alloying is beneficial to improve the high temperature properties of molybdenum. After alloying, the solid solution strengthening and second phase strengthening will occur in molybdenum alloy, which will improve the properties of the alloy. The analysis of the high temperature performance of the representative molybdenum alloy lanthanum molybdenum alloy and TZM alloy has an important role in the further development of molybdenum alloy.
After annealing at 1100℃, a few grains of lanthanum molybdenum alloy and TZM alloy recrystallized, and the recrystallized grains gradually increased with the increase of annealing temperature. Different from the recrystallized structure of pure molybdenum, the recrystallized grains of molybdenum alloy show elongated structure, while the recrystallized grains of pure molybdenum are equiaxed grains.
When the annealing temperature is less than 1400℃, the lanthanum molybdenum alloy has strong strength and plasticity properties. When the temperature is higher than 1400℃, the tensile strength and plasticity are obviously low. The tensile strength of TZM alloy decreases with the increase of temperature, but the plasticity shows an increasing trend, which is contrary to the lanthanum molybdenum alloy. In addition, comprehensive comparison, at the same temperature TZM alloy of high temperature alloy is better than molybdenum lanthanum can be customized production of tantalum and tantalum metal mechanical parts, niobium and niobium metal mechanical parts, tungsten molybdenum alloy machined part, electrode processing, copper impregnated tungsten electrodes, tungsten copper inlay alloy electrode, chromium zirconium copper impregnated tungsten electrodes, tungsten zirconium electrodes, yttrium tungsten electrodes, cerium tungsten electrode.
The thermal brittleness of lanthanum molybdenum alloy is different from that of TZM alloy when the annealing temperature is higher than 1400℃. This is mainly because the streamline structure of Lanthanum molybdenum alloy tends to fracture with the increase of annealing temperature. However, the size, shape and distribution of the second phase of TZM alloy do not change significantly either in the processing state or in the recrystallization state.
Lanthanum molybdenum alloy target MoLa alloy magnetron sputtering material electron beam coating evaporation material.
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Lanthanum molybdenum alloy An alloy consisting of a matrix metal molybdenum and lanthanum trioxide present as a dispersing particle in the matrix. The content of La2O3 in the alloy is generally 0.5%~5.0%(mass fraction).
Molybdenum has high melting point, excellent high temperature performance, good electrical and thermal conductivity, and is an important high temperature structure material. However, due to the relatively high plastic-brittle transition temperature of molybdenum, the molybdenum used at high temperature (higher than the recrystallization temperature) appears severe brittleness when it returns to the vicinity of room temperature. Therefore, researchers at home and abroad have done a lot of research on the addition of rare earth to molybdenum. It is concluded that the addition of rare earth to molybdenum can refine the grain, reduce the plastic-brittle transition temperature of molybdenum, increase the recrystallization temperature of molybdenum, high temperature strength, and improve the tough-plastic and high temperature creep properties of molybdenum.
