LI Jing HUANG Kexiong WANG Zaoji LIU Jun Central South University of Technology
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Changsha
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ChinaGUO Chuntai Changchun Institute of Applied Chemistry
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Academia Sinica
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Changchun
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China LI Jing Professor
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Faculty of Metallurgical Physical Chemistry
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Central South University of Technology
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Changsha 410012
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China
金属学报(英文版)
Interfacial tension between liquid Al and molten fluoride salt was determined using sessile drop method combined with X-ray radiograph.A computer program of curve-fitting for coordination of configuration of sessile drop was used in the picture processing of the sessile drop.Regressive equation were worked out to calculate the density of the molten salt.The in- fluence of mole ratio of NaF/AlF_3,content of Li_2CO_3 and rare-earth oxides in the molten salt on interfacial tension of Al-salt was discussed.The contact angles of liquid Al on the sur- face of graphite,graphitized carbon cathode and the graphite with coating of TiB_2 were de- termined.
关键词:
interfacial tension
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SUN Zhongxi W. Forsling CHEN Jin Division of Inorganic Chemistry
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Lulea University of Technology
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S-951 87 Lulea
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SwedenDept.of Mineral Engineering
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Central South University of Technology
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Changsha
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410083
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ChinaTo whom correspondence should be addressed
材料科学技术（英文）
The complexation of phosphates in the quartz-metal ion-H_2O-oleate system was studied. Computer assisted calculations with the aid of the advanced program SOLGASWATER and known equilibrium constants were used to evaluate the mechanism,The calculation results revealed that in the presence of a certain amount of phosphates, metal ions adsorbed at the quartz-H_2O interface will be transferred into solution.Thus the competi- tion for metal ions between phosphates and the quartz surface leads to surface deactivation and re- duced floatability.Various distribution diagrams clearly demonstrate the change of surface complexation as a function of added phosphate concentration.The deactivation products were also evaluated.
关键词:
complexation
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ZHAO Ruirong JIANG Hanying QIN Yihong ZENG Zhenou YANG Jiyue Central South University of Technology
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Changsha
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China ZHAO Ruirong
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Associate Professor
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Dept.of Chemistry
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Central South University of Technology
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Changsha 410083
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China
金属学报(英文版)
The anode reaction and current density of the electrowinning of Sb from jamesonite concen- trate have been investigate.High anodic current density seems to be the major reason for high energy consumption,air pollution by alkaline mists in workshop as well as poor quality of deposition.A series of steps,such as absorption,phase formation,ageing of passivated films etc.,were found to be involved during the anodic passivating process of Fe in NaOH solution. A new anodic material Fe/Ni/Co_3O_4 was developed so as to save the d.c.electric energy over 160 kWh/t of Sb.
关键词:
Sb
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FANG Zheng ZHANG Pingmin CHEN Xinmin Central-South University of Technology
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Changsha
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China FANG Zheng
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Associate Professor
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Dept.of Chemistry
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Central South University of Technology
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Changsha 410083
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China
金属学报(英文版)
A new molybdenum oxide phase which exists in bomb combustion products of Mo was found. It has been determined that this phase is a transformed MoO_3 of triclinic system.One set of its lattice parameters was also determined from the X-ray diffraction data as α=0.4049± 0.0001 nm,b=0.5079±0.0003 nm,c=1.4339±0.0009 nm,α=115.16±0.08°,β=90.69± 0.14°,γ=105.58±0.05° and unit cell volume=0.2544 nm~3.
关键词:
Mo oxide
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WANG Mingpu
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LIU Jinwen Central South University of Technology
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Changsha
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China Lecturer
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Dept.of Materials Science and Engineering
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Central South University of Technology
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Changsha 410083
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China
金属学报(英文版)
The stabilization of thermoelastic martensite in a rapidly solidified Cu-Zn-A1 alloy is be- lieved to be the process of disordering in atomic configuration during which the structure of martensite gradually transforms into N9R(b/a=1/3~(1/2))from M18R.This is dependent upon the intrinsic decomposition tendency of the martensite.
关键词:
Cu-Zn-Al alloy
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FANG Zheng CHEN Xinmin(H.M.Chen) Central South University of Technology
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Changsha
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China FANG Zheng
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Associate Professor
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Department of Chemistry
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Central South University of Technology
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Changsha
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China
金属学报(英文版)
By taking the effect of oxygen contents into account,a new set of formulae which represents the oxygen potentials of H_2O-H_2 and H_2O-H_2-inerts gas mixtures has been derived.Classi- cal representation is only a particular case of it.Some of the variables affecting equilibrium atmosphere when trace oxygen is present and optimum preparation of the gas mixtures to min- imize errors have been discussed.The reliability of some of previous equilibrium experiments under the oxygen potentials controlled by H_2O-H_2 or H_2O-H_2-inerts gas mixtures has also been criticized.
关键词:
gas equilibration method
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LU Xiaoye Central south University of Technology
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Changsha
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China Lecturer
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Dept.of Materials Science and Engineering
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Central South University of Technology
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Changsha 410083
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China
金属学报(英文版)
The stability of thermoelastic martensite in a Cu-14.84 wt-%Zn-7.75 wt-%Al shape mem- ory alloy with M_s=106°C after direct quenching or stepped quenching has been investigated by using TEM,X-ray diffroctometer and double electric bridge instrument.The martensite aged for about 3 h at room temperature after either direct quenching or stepped quenching (150°C,2 rain)is the M18R structure.The martensite just directly quenched is not so stable, both its certain diffraction peaks and specific electric resistivity,change with aging at room temperature;whereas it is stable after stepped quenching(150°C.2 min),and its diffraction peaks and specific electric resistivity change no more with aging at room temperature.The above mentioned results seem to be explained by the martensite reordering.
关键词:
Cu-Zn-Al alloy
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HUANG Huimin CHEN Xinmin Central South University of Technology
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Changsha
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China HUANG Huimin Associate Professor
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Department of Chemistry
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Central South University of Technology
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Changsha
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China
金属学报(英文版)
The nature of the oxygen contained in β-W was investigated with DSC,X-ray analysis on quenched samples and Auger spectroscope.It was shown that the oxygen contained in nonpyrophoric β-W consists of the reversibly chemisorbed oxygen and the interstitial oxygen which could form an interstitial solid solution with β-W.It seems better to consider β-W to be a metastable phase of tungsten with the interstitial oxygen as stabilizer.
关键词:
tungsten
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QU Xuanhui HUANC Baiyun LEI Changming CHEN Shiqi Central South University of Technology
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Changsha
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China professor
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Powder Metallurgy Research Institute
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Central South University of Technology
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Changsha 410083
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China
金属学报(英文版)
Synthesis process of a TiAl+TiB_2 composite from the elemental powders was studied by means of differential scanning calorimetry and X-ray diffractometry.TiB_2 particles may form in TiAl matrix at temperature even below 700℃ owing to the exothermic reactions between Ti and Al powders.TiB_2 particles are very thermally stable,and they almost did not change in their relative amount,morphology and size after the synthesized composite was remelted.In addition,the existence of TiB_2 particles has obvious refining effect in the as-cast microstructure of TiAl-base alloys.
关键词:
TiAl alloy
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