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Molybdenum is a refractory rare metal (melting point 2620 ℃), its expansion coefficient, electrical conductivity, good thermal conductivity properties, and both high temperature and high temperature strength. Molybdenum and alloys in important sectors metallurgy, agriculture, electrical, chemical, environmental and aerospace applications, such as have a good prospect, economic development is indispensable important strategic materials. While molybdenum has excellent high temperature performance, but at around room temperature, but exhibited severe brittleness that in the course of processing and prone to brittle fracture. Low temperature brittleness and poor high temperature oxidation resistance of molybdenum and molybdenum alloys, limiting its scope of application as structural materials. Therefore, we must further research to develop superior performance of the new molybdenum alloy. 

    

Research shows that adding pure molybdenum or molybdenum alloy in the right amount of rare earth oxides, rare earth molybdenum alloy can be prepared. When molybdenum is added rare earth elements, one of rare earth elements in the crystal grain boundaries and formation of particles dispersed within, thereby improving the plastic material; the other hand, the gap between carbon and oxygen impurities in the grain boundary segregation of reduced, thereby improving low temperature brittleness alloy and reduce plastic - brittle transition temperature. Molybdenum alloy of rare earth additives mainly Y2O3, La2O3, Nd2O3, Sm2O3, Gd2O3 and other rare earth element oxide, it is usually added in an amount of about 1%, a particle size in the submicron range control. The rare earth oxide was added in a molybdenum can increase the recrystallization temperature to about 400 ~ 500 ℃, and molybdenum to improve the room temperature tensile strength, high temperature sag resistance performance is also particularly significant role. Sort of rare earth oxides of molybdenum to improve the performance of the anti-sagging effect sizes were: La2O3> Sm2O3> Nd2O3> Gd2O3> Y2O3; sort of high-temperature tensile properties of molybdenum to improve the role of the size of the order of: La2O3> Nd2O3> Sm2O3> Gd2O3> Y2O3. RE molybdenum alloy has good toughness, high temperature characteristics, especially liquid - liquid doped lanthanum oxide molybdenum alloy to improve the performance of the best. Lanthanum oxide sintered molybdenum can significantly increase the bending strength and bending the blank angle: up to a maximum bending strength 930MPa, more than 52% increase pure molybdenum sintered billet; bending angle increases from 5 ° of pure molybdenum blanks to 15.3 °. By 30% after forging deformation, sintered rare earth molybdenum billet flexural strength increased significantly.

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