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Study on Preparation Technology, Microstructure and Properties of La-Mo Alloy Slab

Author: RenRu
Tutor: ZhaoXiCheng；YangHongZhong
School: Xi'an University of Architecture and Technology
Course: Materials Engineering
Keywords: La-Mo alloy slab La2O3 sintering process fine grain strengthening
CLC: TF84
Type: Master's thesis
Year: 2009
Downloads: 76
Quote: 0
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Abstract


Mo plate mainly used for electric light source parts, electric vacuum devices, heat shield, heater, Mo electrode and Mo boat, Mo crucible and so on, which would be widely use in the future. RE oxide was widely used in Mo alloy because of its stable chemical structure and good strengthening effect. The addition of RE oxide can significantly increased the recrystallization temperature and anti-sag properties of molybdenum. RE-Mo with excellent anti-sag performance and high-temperature properties gradually replaced pure Mo. At present, the mature RE-Mo alloys mainly are La-Mo alloy, Mo-Y alloys, Mo-0.5Ti + Y, and so on.This article improved the slab performance mainly by doping La element. For the whole process, this paper focused on the effects of raw material, changes of various data of raw material, pressing technology and sintering technology on the properties of Mo slab, and determined the best production technology of Mo slab, which was suitable for the requests of following process under certain data scale of raw material. Properties of La-Mo alloy slab and pure molybdenum plate were compared by measuring their room-temperature bending performance and high-temperature performance. The strengthening mechanism of La-Mo slab was also analyzed and researched.This paper identified the production technology of La-Mo slab and the best doping value of RE oxide La2O3, which is 0.5%-0.7%. The results show that the RE oxide La2O3 activated the sintering process of Mo, increased the density of Mo slab and fined grains of the sintering Mo slab. The fine-grain strengthening mechanism enhanced the bending strength and toughness of Mo slab, and improved mechanical properties after the high-temperature vacuum annealing.

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CLC: > Industrial Technology > Metallurgical Industry > Nonferrous metal smelting > Rare metal smelting
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