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中国有色金属学会会刊：英文版 2000年第S1期10卷 12-18页

作者： R. Du Plessis 1, J.D. Miller 1, J.C.Davidtz 2.1. department of metallurgical {2., university of Utah, Salt Lake City, Utah 84102. USA 2. department of materials science and metallurgical engineering, university of pretoria, pretoria 0002 Univ Utah Dept Met Engn Salt Lake City UT 84102 USA Univ pretoria Dept Met Engn & Mat Sci ZA-0002 Pretoria South Africa

The redox potentials of xanthate/dixanthogen (dithiocarbonate/di dithiocarbonate, DTC/(DTC) 2. and trithiocarbonate/di trithiocarbonate (TTC/(TTC) 2. couples have been measured for the potassium salts. The spectroscopic characteristics of these sulfide mineral collectors were determined by FTIR and UV analysis. Electrochemically controlled contact angle measurements at a pyrite surface provided the basis to analyze the effect of the functional group ( O CS 2.versus S CS 2. on the hydrophobic surface state. Results from this preliminary examination are discussed with respect to the nature of collector adsorption and the pyrite flotation response.

关键词： redox potential trithiocarbonate collector sulfide mineral flotation

Comparison of the Molecular Interaction Volume Model with the Unified Interaction Parameter Formalism in the Fe-Cr-Ni Liquid Alloys at 1873 K

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Journal of materials science & Technology 2006年第4期22卷 559-564页

作者： Dongping TAO Faculty of materials and metallurgical {2., Kunming university of science and Technology, Kunming 650093, China Faculty of materials and metallurgical {2. Kunming University of Science and Technology Kunming 650093 China

The molecular interaction volume model (MIVM) for a general ternary system was deduced in detail for further clarifying and understanding its general multicomponent expression. Both MIVM and the unified interaction parameter formalism (UIPF) can be used to predict the activities of solutes and solvents in the Fe-Cr-Ni liquid alloys. But the former employs only the infinite dilute activity coefficients, and the later is not applicable without the dilute binary and ternary interaction parameters. MIVM has a certain physical meaning from the viewpoint of statistical thermodynamics, so it is an alternative for the estimation of activity coefficients of the solutes and solvents in a dilute or finite concentration metal solution where the interaction parameters are absent or their accuracies are questionable.

关键词： Activity Prediction Molecular interaction volume model Unified interaction parameter formalism

HYDRIDING INFLUENCE OF INDIUM ON Pd-In ALLOYS

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中国有色金属学会会刊：英文版 1996年第3期6卷 63-67页

作者： Chen Yanglin(department of materials {2. and engineering, Zhejiang university, Hangzhou 31002.) ZHEJIANG UNIV DEPT MAT SCI & ENGNHANGZHOU 310027PEOPLES R CHINA

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关键词： hydriding valence electrons lattice dilatation Fermi energy

Dynamic damage and stress-strain relations of ultra-high performance cementitious composites subjected to repeated impact

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science China(Technological sciences) 2010年第6期53卷 1520-1525页

作者： LAI JianZhong1 & SUN Wei2.1 department of materials {2. and engineering,Nanjing university of {2. and Technology,Nanjing 2.0094,China 2.College of materials {2. and engineering,Southeast university,Nanjing 2.1189,China 1. department of materials {2. and engineering Nanjing University of Science and Technology Nanjing 210094 China2. College of Materials Science and Engineering Southeast University Nanjing 211189 China

Ultra-high performance cementitious composites (UHPCC) were prepared by replacing 60% of cement with ultra-fine industrial waste *** dynamic damage and compressive stress-strain relations of UHPCC were studied using split Hopkinson pressure bar (SHPB).The damage of UHPCC subjected to repeated impact was measured by the ultrasonic pulse velocity *** show that the dynamic damage of UHPCC increases linearly with impact times and the abilities of repeated impact resistance of UHPCC are improved with increasing fiber volume *** stress waves on impact were recorded and the average stress,strain and strain rate of UHPCC were calculated based on the wave propagation *** effects of strain rate,fibers volume fraction and impact times on the stress-strain relations of UHPCC were *** show that the peak stress and elastic modulus decrease while the strain rate and peak strain increase gradually with increasing impact times.

关键词： ultra-high performance cementitious composites (UHPCC) split Hopkinson pressure bar (SHPB) repeated impact damage stress-strain

A Series Piezoelectric Quartz Crystal Response Kinetics for *** Growth in the Presence of Cu(Ⅱ)

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Journal of Central South university 2000年第1期12卷 15-19页

作者： CHAI Li yuan 1,2.,WEI Wan zhi 2.YAO Shou zhuo 2.1. department of metallurgical {2. and engineering, Central South university of Technology, Changsha 410083, China 2. College of Chemistry and Chemical engineering, Hunan university, Changsha 1. department of metallurgical {2. and engineering Central South University of Technology 410083 Changsha China 2. College of Chemistry and Chemical engineering Hunan University 410082 Changsha China

The kinetics on the growth of *** in the presence of Cu(Ⅱ) was studied using of series piezoelectric quartz crystal (SPQC). Arsenic ion inhibits the growth of *** , which is consistent with the previous results by other measuring methods. This further demonstrates that the SPQC can monitor the chemical activity of *** growth. Cupric ion accelerates the growth of *** . The mechanism was discussed, i. e., copper promotes the protein enzyme of *** , rusticyanin, to form over the range of cupric ion concentration studied. The reaction order of cupric ion in accelerating the bacterial growth is 0.067. The growth of *** is dependent on temperature, the apparent reaction activation energy decreases from 2..56 kJ/mol to 18.32.kJ/mol because of the addition of 10 mg/L Cu(Ⅱ) to the bacterial growth solution of pH 2.0 at initial inoculum of 10%.

关键词： series piezoelectric quartz crystal T.ferrooxidans growth kinetics sigmoid curve cupric ion

Effects of Ca substitution and surface treatment on electrochemical performances of Ml_(1.0-x) Ca_xNi_(4.0) Co_(0.6) Al_(0.4) hydrogen storage alloy electrodes

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中国有色金属学会会刊：英文版 1999年第3期9卷 487-492页

作者： Chen Weixiang(陈卫祥) 1, Qi Jianqin(祁建琴) 1, Chen Changpin(陈长聘) 2.1. department of Physics 2. department of {2. science and engineering, Zhejiang university, Hangzhou 31002., P. R. China Zhejiang Univ Dept Phys Hangzhou 310027 Peoples R China Zhejiang Univ Dept Mat Sci & Engn Hangzhou 310027 Peoples R China

The influences of Ca substitution for Ml and surface treatment on electrochemical performances of Ml 1.0- x Ca x Ni 4.0 Co 0.6 Al 0.4 hydrogen storage alloy electrode were investigated. Ca substitution with x 2.for Ml could improve its discharge capacity, but Ca substitution with x >0.2.could decrease the capacity. It was also found that Ca substitution deteriorates the electrocatalytic activity, high rate dischargeability and cycling durability of the alloy electrode. In order to improve these properties of Ml 1.0- x Ca x Ni 4.0 Co 0.6 Al 0.4 alloy electrode, the alloy was treated in 6 mol/L KOH+0.02.mol/L KBH 4 solution. The results showed that the surface treatment improves the electrochemical performances such as the electrocatalytic activity, high rate dischargeability and cycling durability of the alloy electrode. :The influences of Ca substitution for Ml and surface treatment on electrochemical performances of Ml 1.0- x Ca x Ni 4.0 Co 0.6 Al 0.4 hydrogen storage alloy electrode were investigated. Ca substitution with x 2.for Ml could improve its discharge capacity, but Ca substitution with x >0.2.could decrease the capacity. It was also found that Ca substitution deteriorates the electrocatalytic activity, high rate dischargeability and cycling durability of the alloy electrode. In order to improve these properties of Ml 1.0- x Ca x Ni 4.0 Co 0.6 Al 0.4 alloy electrode, the alloy was treated in 6 mol/L KOH+0.02.mol/L KBH 4 solution. The results showed that the surface treatment improves the electrochemical performances such as the electrocatalytic activity, high rate dischargeability and cycling durability of the alloy electrode.

关键词： hydrogen storage alloy electrode Ca substitution surface modification

Thermodynamics calculation on the oxidation and sulfur removal abilities of slag in EAF dust pellet reduction process

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Journal of Central South university of Technology 2001年第1期8卷 64-68页

作者： PENG Bing 1,PENG Ji 1,ZHANG Chuan fu 1,Jonathan Lobel 2.Janusz A. Kozinski 2.(1 department of metallurgical {2. and engineering, Central South university, Changsha 410083, China 2.department of metallurgical engineering, McGill university 1. department of metallurgical {2. and engineering Central South University 410083 Changsha China 2. department of metallurgical {2. McGill University 3610 University Street H3A 2B2 Montreal QC Canada

The valuable metals in the dust can be recycled by mixing it with reducing agent carbon and lignosulfonate as the binder to make pellets, then returning the pellets to electric arc furnace (EAF) and adding ferro silicon. Part of valuable metals in the dust is reduced by carbon and part of them reduced by ferro silicon for the economical consideration. The reduced metals get into the steel in the stainless steel or special steel production. But the sulfur in the lignosulfonate may affect the quality of produced steel, which is dependent on the status of the smelting slag. The experiments were conducted in the way of changing the ratio of start iron, pellets, ferro silicon and lime. The content of the slag was checked by XRF for the calculation thermodynamics study. The active concentrations of materials in the slag, the slag abilities of oxidation and sulfur removal in EAF dust reduction process were determined by thermodynamics calculation study on CaO MgO FeO Fe 2. 3 SiO 2.S slag at 1 550 ℃. The oxidation ability of slag can be expressed as N (FetO)= N (FeO)+6 N (Fe 2. 3)+8 N (Fe 3O 4). The sulfur removal ability is dependent on the amount of added ferro silicon and the basicity of the slag. The calculation thermodynamics model was set up and it could be applied to the practical production.

关键词： thermodynamics calculation slag electric arc furnace dust

PRECIPITATION HARDENING IN B2.ORDERED NiAl BY Ni_(2.AlTi COMPOUND

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Acta Metallurgica Sinica(English Letters) 2001年第5期14卷 313-318页

作者： W.H. Tian, K. Ohishi and M. Nemoto 1)department of materials Physics and Chemistry, {2. of science and Technology Beijing, Beijing 100083, China 2.department of materials science and engineering, Faculty of engineering 36, Kyushu {2., Fuk Dept. of Mat. Phys. and Eng. Univ. of Sci. and Technol. Beijing Beijing 100083 China

Microstructural variations and correlated hardness changes in B2.ordered NiAl containing fine precipitation of Ni2.lTi have been investigated by means of transmission electron microscopy (TEM) and hardness tests. The amount of age hardening is not large as compared to the large microstructural variations during aging. TEM observations have revealed that the L2.-type Ni2.lTi precipitates keep a lattice coherency with the NiAl matrix at the beginning of aging. By longer periods of aging Ni2.lTi precipitates lose their coherency and change their morphology to the globular ones surrounded by misfit dislocations. The temperature dependence of the yield strength of precipitate-containing B2.ordered NiAl was investigated by compression tests over the temperature range of 873-12.3 K. The fine precipitation of Ni2.lTi was found to enhance greatly the yield strength and the high-temperature strength is comparable with that of superalloy Mar-M2.0.

关键词： Aluminum Hardening Mechanical properties Nickel Precipitation (chemical)

PRECIPITATION BEHAVIOUR AND HARDENING OFB2.ORDERED Ni(Al, Ta)

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Acta Metallurgica Sinica(English Letters) 1997年第2期10卷 99-104页

作者： W.H. Tian and M. Nemoto2.department of materials Physics, {2. of science and Technology Beijing, Beijing 100083, China)(department of materials science and engineering, Faculty of engineering, Kyushu {2., 812.Fukuoka, Japan) Univ of science and Technology Beijing Beijing China

Precipitation of Ni2.l in supersaturated NiAl containing Ta and corresponding hardening have been investigated by hardness measurements and by transmission electron microscope observations. Selected area electron diffraction, high resolution electron microscopy and energy dispersive X-ray spectrometer analysis have shown that the Ni2.l with a hexagonal structure precipitates coherently in the B2.NiAl matrix. Ni2.l is an ordered phase with a. unit cell parameter, aNi2.ll=aNiAl and CNi2.l= aNiAl. The orientation relationship between the Ni2.l precipitate and the B2.NiAl matrix is (0001)Ni2.l (111)NiAl and [112.]Ni2.l[110]NiAl. NiAlhardens appreciably by the precipitation of Ni2.l phase.

关键词： intermetallic compound precipitation hardening TEM HREM,EDS

Dynamic behavior of polymer surface and the time dependence of contact angle

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science China Chemistry 2005年第6期48卷 553-559页

作者： WANG Xinping1, CHEN Zhifang1 & SHEN Zhiquan2.1. Key Laboratory of Advanced Textile materials and Manufacturing Technology of Education Ministry, department of Applied Chemistry, Zhejiang Institute of {2. and Technology, Hangzhou 310033, China 2. department of Polymer {2. and engineering, Zhejiang university, Hangzhou 31002., China 1. department of Applied Chemistry Zhejiang Institute of Science and Technology Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Education Ministry 310033 Hangzhou China 2. department of Polymer science and {2. Zhejiang University 310027 Hangzhou China

Time-dependent contact angles were measured by depositing sessile drops of wa-ter on the polymer surfaces and monitoring the drop shape as a function of time. It was found that contact angles decreased sharply with contact time and the equilibrium contact angle was finally attained after a certain time. Values of starting (θ s) and equilibrium contact angles (θ e) obtained by the sessile drop method depend on polymer properties. The Wilhelmy plate technique was used to measure advancing and receding contact angles. The variations of starting (θ s) and equilibrium contact angles (θ e), advancing (θ a) and receding contact angles (θ r) have been studied on the oxidized surface of polymers containing polybutadiene block to explore the cause of time-dependence in contact angle measurement and the meaning of θ s and θ e. The results showed the linear relationships between starting (θ s) and advancing contact angles (θ a), the equilibrium (θ e) and receding contact angles (θ r). The similar relationship was also established between the contact angle hysteresis (θ a?θ r) and differences (θ s ?θ e) in starting contact angles and equilibrium contact angles. Therefore, time-dependence in contact angle measurement was mainly attributed to the surface reconstruction when water drops were deposited on polymer surfaces. The starting contact angle was contributed by the hydrophobic component on polymer surface and the equilibrium contact angle mainly by the hydrophilic component of polymer. These results not only demonstrated the interdependency between two contact angle measurements, the sessile drop method and the Wilhelmy plate technique, but also provided the experimental evidence to explain the cause of time-dependent contact angle. This may also provide a new method to study dynamic behavior of polymer surface.

关键词： contact angle, surface dynamic behavior, polymer surface, dynamic contact angle, time-dependence.