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STUDY ON EROSION RESISTANCE PROPERTIES OF O'-SIALON-BN IN molten STEEL

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Acta Metallurgica Sinica(English Letters) 2001年第2期14卷 85-90页

作者： Q. Zhen, W.Z. Ding and W.C. Li (Shanghai Enhanced Laboratory of Ferrometallurgy, Shanghai University, Shanghai 200072, China) (University of Science and Technology Beijing, Beijing 100083, China) Shanghai Enhanced Laboratory of Ferrometallurgy Shanghai University University of Science and Technology Beijing

The erosion resistance properties of O'-Sialon-BN in molten steel are investigated in this work. According to experimental results and theoretical analysis, BN in O'-Sialon-BN plays an important role in the molten steel erosion resistance. And the erosion kinetics of the O'-Sialon-BN composites in molten steel is controlled by two stages: the first one is controlled by the chemical reaction taking place on the interface; the second one is controlled by diffusion. The erosion surface of materials is also investigated with fractal theory. The results show that the fractal dimensions of the erosion surface vary with the erosion time from a linear way to a parabolic way, which is related to the erosion mechanism change from interface chemical reaction to diffusion.

关键词： Corrosion resistance Doping (additives) Fractals Liquid metals molten materials

Electrochemical Study on Formation of Dy-Ni Alloy in molten Chlorides

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Rare Metals 1996年第4期15卷 252-256页

作者：童叶翔刘冠昆杨绮琴洪惠婵陈胜洋甘罗中山大学化学系广东广州

The cyclic voltammetry, electrode potential-time curve after potentiostatic electrolysis, potential-step method and X-ray diffraction were used to study the electrochemical reaction of Dy (III) in NaCl-KCl equimolar mixture on Ni electrode. The DyNi5 forms at first and then the intermetallic compounds of DyNi containing more Dy form in sequence. The metallic Dy deposits at last. The standard free energy of formation for DyNi5 determined is -125.6 kJ/mol at 973K. The diffusion coefficient of Dy into DyNi5 phase determined is 8×0-10 cm2/s at 1032 K. The diffusion activation energy of Dy atoms in its intermetallic compound is 101.3 kJ/mol at 973K.

关键词： Chlorine compounds Electrochemistry molten materials Nickel alloys

molten Salt Electrodeposition of Praseodymium-iron Alloy

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Rare Metals 1995年第2期14卷 118-122页

作者：刘冠昆杨绮琴童叶翔周贤志陈青松 Zhongshan Univ Guanzhou China

The electrochemical behaviour of Pr(III) on iron electrode in molten PrCl3-KCl-NaCl was studied by means of cyclic voltammetry and potential-time curve method. The results show that the reduction of Pr(III) to Pr on the iron electrode proceeds reversibly in one step and forms Pr-Fe alloys. The Pr-Fe alloys are obtained by molten salt electrolysis with molten KCl-NaCl as electrolyte and PrCl3 as raw materials. The composition of electrolytic product is PrFe2 and Pr analysed by X-ray diffraction. Pr recovery efficiency is 90% and the current efficiency is 85%.

关键词： Electrodeposition molten materials Praseodymium alloys Salts

Preparation of Yttria-doped Zirconia Powder from molten Salts

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Rare Metals 1995年第2期14卷 91-95页

作者：张昭四川大学四川成都 610065 Imperial College 英国

The production of Y2O3-ZrO2 powder by the reaction of zirconium salt and yttrium salt, combined in a certain proportion, with sodium nitrate under molten state was described. The effects of adding Cl-, Br- and CO2-3 anions, as well as introducing ultrasonic vibration during the reaction on the crystallite size of Y2O3-Zr2O3 powder were investigated.

关键词： Doping (additives) Fabrication molten materials Powders Yttrium compounds