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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Effect of dopant content on microstructure and properties of
Si-Al-K doped molybdenum
LI Da-cheng(李大成)1, ZHOU Zhang-jian(周张健)2, PU Chun-yang(卜春阳)1

1. Technology Center, Jinduicheng Molybdenum Industry Co., Xi’an 710068, China;
2. Laboratory of Special Ceramic and Powder Metallurgy, University of Science and Technology Beijing,
Beijing 100083, China;

Abstract:The effect of aluminum, potassium and silicon (AKS) content on the high-temperature properties and microstructure of molybdenum powder, sintering product and fabricated wires were studied. The molybdenum powder was produced firstly by reduction of molybdenum oxide which is doped with K2SiO3 and Al(NO3)3∙9H2O. Then doped molybdenum powder was cold pressed into cylindrical compact with diameter of 17 mm, and sintered in induction furnace. The microstructure of molybdenum ingots was examined by transmission electron microscopy. The results show found that the doped elements form non-crystalline phase and distribute along the interface of Mo, thus inhibit the grain growth of Mo. Finally, the sintered Mo was drawn into wires with a diameter of 0.70 mm. The formed non-crystalline particles are changed into row of fine particle during the drawing process.

 

Key words: doped molybdenum; wire drawing; microstructure

ISSN 1672-7029
CN 43-1423/U

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