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Microstructure and properties of Nd：YAG laser welded AZ31B magnesium alloy

China Welding 2014年第2期23卷 29-35页

作者： Cui Zeqin Cheng Linxin Si En Wang Wenxian Xu Bingshe College of Materials Science and Engineering Taiyuan University ofTechnology Taiyuan 030024 Key Laboratory of Interface Science and Engineering inAdvanced Materials Ministry of Education Taiyuan 030024

Biodegradable magnesium-based alloys are very promising materials for temporary implants. Laser welding is an important joining method in such application. In this study, the as-rolled AZ31B magnesium alloy sheets of 1 mm in thickness were successfully joined by Nd ： YAG laser welding. The microstructure and properties of the welded joint were investigated. The result shows that the welded joint is characterized by a narrow heat-affected zone, finer grains and a large number of precipitates distribute in the matrix in the weld. Microhardness of the weld is significantly improved to 72 HV 0. 05 as compared to 55 HV 0. 05 of the base metal. Tensile strength of butt-welded joint is 180. 24 MPa, which is 76. 8% that of the base metal. The electrochemical corrosion experiment shows that the corrosion resistance of laser welded joint is significantly improved in a 3.5 wt. % NaCl solution.

关键词： AZ31 B Mg alloy sheet laser welding Nd：YAG pulsed laser welded joint

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Simulation calculation and preparation of top emitting OLEDs with transparent anode of MoO3/Ag/MoO3

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Faguang Xuebao/Chinese Journal of Luminescence 2015年第4期36卷 459-465页

作者： Li, Yuan-Hao Wu, Cong-Ling Yang, Jun-Li Li, Wan-Li Liu, Hui-Hui Jia, Hu-Sheng Wang, Hua Liu, Xu-Guang Wu, Yong-An Key Laboratory of Interface Science and Engineering in Advanced Materials Minisity of Education Taiyuan University of Technology Taiyuan030024 China Research Center of Advanced Materials Science and Technology Taiyuan University of Technology Taiyuan030024 China Material Science and Engineering Institute Taiyuan University of Technology Taiyuan030024 China Chemistry and Chemical Engineering Institute Taiyuan University of Technology Taiyuan030024 China Shanxi Guoguang Semiconductor Lighting Engineering Co. Ltd. Taiyuan030006 China

The transfer matrix method and the orthogonal analysis method were used to calculate the optimum film thickness of MoO3/Ag/MoO3 as a transparent anode. In order to validate the accuracy of simulation calculation, MoO3/Ag/MoO3 transparent anodes with different thickness of MoO3 and Ag films were fabricated. Then, the top emitting OLEDs with structure of Al/LiF/tris(8-hydroxyquinolinato)aluminum(Alq3)/N,N'-bis-(1-naphthyl)-N,N'- biphenyl-1,1'-biphenyl-4,4'-diamine(NPB)/MoO3/Ag/MoO3 were fabricated to further verify the accuracy of the simulation calculation used in device fabrication. When the electrode thickness is MoO3 (10 nm)/Ag (10 nm)/MoO3 (25 nm), the device reaches the most optimal performance. The maximum transmittance is 88.256% at 532 nm. And the maximum luminance and luminous efficiency are 20 076 cd/m2 and 4.03 cd/A, which are improved by 18.5% and 56% compared with the reference device, respectively. The results demonstrate a practical way to fabricate highly efficient top emitting OLEDs. ©, 2015, Chines Academy of sciences. All right reserved.

关键词： Anodes

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Microstructural Characterizations and Mechanical Properties of Mg-8Sn-1Al-1Zn-xCu Alloys

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Journal of Wuhan University of Technology(Materials science) 2014年第4期29卷 803-807页

作者：程伟丽 WANG Miao QUE Zhongping WANG Hongxia ZHANG Jinshan XU Chunxiang YOU Bongsun YIM Changdong Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education Taiyuan University of Technology School of Materials Science and Engineering Taiyuan University of Technology Korea Institute of Materials Science Changwon 641-831 Republic of Korea

Microstructural characterization and mechanical properties of as-cast Mg-8Sn-1Al-1Zn-xCu（x=0wt%, 1wt%, 1.5wt% and 2.0wt%） alloys were studied by OM, Pandat software, XRD, SEM, DSC and a standard universal testing machine. The experimental results indicate that adding Cu to TAZ811 alloy leads to the formation of the AlMgCu and Cu3 Sn phases. Tensile tests indicate that yield strength increases fi rstly and then decreases with increasing Cu content. The alloy with the addition of 1.5wt% Cu exhibits optimal mechanical properties among the studied alloys. The improved mechanical properties can be ascribed to the second phase strengthening and fi ne-grain strengthening mechanisms resulting from the more dispersed second phases and smaller grain size, respectively. The decrease in ultimate tensile strength and elongation of TAZ811-2.0wt% Cu alloy at room temperature is ascribed to the formation of continuous AlMgCu and coarse Mg2 Sn phases in the liquid state.

关键词： Mg alloys phase formation microstructure mechanical properties

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Adsorption properties of the macro/nano-clay in crystal violet solution

Adsorption properties of the macro/nano-clay in crystal viol...

引用

Chinese Materials Congress, CMC 2014

作者： Bai, Hai Hui Jin, Ran Zhang, Qing Song Zheng, Guo Guo, Di Textile College Tianjin Polytechnic University 399 Binshui West Road Tianjin300387 China College of Physics and Materials Science Tianjin Normal University 393 Binshui West Road Tianjin300384 China Key Laboratory of national hollow fiber membrane materials and processes Department College of Materials Science and Engineering Tianjin Polytechnic University 399 Binshui West Road Tianjin300387 China Tianjin Textile Fiber Interface Technology Engineering Center 399 Binshui West Road Tianjin300387 China

ISBN: (纸本)9783038353935

In this study, different appearances, structures and morphologies of macro-clay G105-Polymer grade montmorillonite (PMMT) and nano-clay Lithium magnesium silicate (LMSH) were compared and analyzed, which were used in different conditions of non-adsorption and adsorption of crystal violent(CV). Adsorption kinetics and properties of the macro/nano-clay in CV solution were studied, and adsorption time, dye concentration and environmental pH were the main factors on the inspection in this work. The adsorption mechanisms of the macro-/nano-clay on CV were investigated. The results showed that adsorption actions of PMMT and LMSH on CV were some similar, such as time-dependent, linear growth of adsorbed CV amount with increasing CV concentration, adsorption capacity of macro-/nano-clay declined firstly and then increased in 10mg/L CV solution along with increasing pH value. But the adsorption differences in two systems of PMMT-CV and LMSH-CV were obvious. Adsorption behavior of LMSH-CV system showed two adsorption phenomena. Under neutral conditions, adsorbed CV amount in 0.5g LMSH was 1.69 times that of PMMT. Adsorption amount of LMSH was more significant to be affected by dye concentration and pH conditions. The research achievements further showed that adsorption mechanism was the root cause of the following difference. The adsorption of PMMT- CV relied mainly on iron-exchange effect of layers replaceable cations and surface adsorbed ions with CV cations, while the significant adsorption of LMSH- CV was mainly due to the electrostatic interaction from layers negative charge distribution and CV cationic properties in the solution, partly surface ions exchanges also existed in the adsorption process of LMSH-CV. © (2015) Trans Tech Publications, Switzerland.

关键词： Adsorption

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HOW MUCH, WHERE, AND WHAT KIND OF GD TO LOAD FOR THE BEST OF MRI

HOW MUCH, WHERE, AND WHAT KIND OF GD TO LOAD FOR THE BEST OF...

引用

第十六届北京分析测试学术报告会暨展览会(BCEIA 2015)

作者： Binbin LI Hongyan ZHANG Yanhui ZHANG Bo TAN Hailu ZHANG Zongwu DENG Key Laboratory of Nano-Biological Interface and Division of Nanobionics Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences lnstitute of Nanoscience and Nanotechnology University of Science and Technology of China Institute of Environmental and Chemical Engineering Shanghai University

We present a general approach for quantitative assessment of cellular MRI performance of contrast *** approach includes measurement of T1-and T2-weighted image contrast/signal intensity as well as T1-and T2-relaxation rates on cell pellets and their dependence on cellular Gd content.A complete and quantitative correlation is established between the image contrast and the relaxation *** MRI is then conducted on human mesenchymal stem cells(h MSCs)labeled by Gd agents via pinocytosis or

关键词： AND WHAT KIND OF GD TO LOAD FOR THE BEST OF MRI WHERE HOW MUCH

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Investigation on the structural changes of cobalt-based catalytic composite materials before and after Fischer-Tropsch reactions

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Gongneng Cailiao/Journal of Functional Materials 2015年 46卷 67-70页

作者： Xing, Yu Xue, Yingying Liu, Zhenxin Wu, Depeng Fang, Shaoming Henan Provincial Key Laboratory of Surface and Interface Science School of Materials and Chemical Engineering Zhengzhou University of Light Industry Zhengzhou China

There are many literature about the reactions of cobalt-based catalytic materials in Fischer-Tropsch synthesis (FTS). However, the literature about the structural changes of cobalt-based materials before and after the FTS reactions due to the hydrothermal environments is sparse. This article applied FESEM to study the texture features of three freshly-prepared cobalt-based composite materials and employed powder XRD to investigate the structural changes of the three cobalt-based catalytic materials. It was found that the samples containing alumina will form the diffraction peaks of new species at 2θ of 21.5 and 23.8°, which might be some kind of crystalline hydrated alumina. This type of new species might react with the cobalt species formed by H2O oxidation and produce non-catalytic CoAl2O4 phase which was one cause of deactivation or decay of cobalt catalysts. ©, 2015, Journal of Functional Materials. All right reserved.

关键词： Composite materials

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Effects of Processing Technologies on Mechanical Properties of SiC Particulate Reinforced Magnesium Matrix Composites

引用

Journal of Wuhan University of Technology(Materials science) 2014年第4期29卷 769-772页

作者：樊建锋 ZHANG Hua DONG Hongbiao XU Bingshe ZHANG Zhifeng SHI Likai Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology Ministry of EducationTaiyuan University of Technology Shanxi Research Center of Advanced Materials Science and Technology College of Materials Science and Engineering Taiyuan University of Technology Beijing General Research Institute for Non-ferrous Metals

Mg matrix composites with SiC particles ranging from 5vol%-25vol% were prepared using stirring casting method. Die casting, squeezing casting, and extrusion were applied for inhibiting or eliminating the defects such as gas porosity and shrinkage void. Through die casting and squeezing casting, most of the defects in Mg matrix composites could be eliminated, but the mechanical properties were improved limitedly. On the other hand, after hot extrusion, not only most of the defects of as-cast composites ingots were eliminated, but also the mechanical properties were improved markedly. With the addition of SiC, the tensile strength, yield strength and elastic modulus of as extrusion SiCp/AZ61 composites increased remarkably, and the elongation decreased obviously.

关键词： Mg matrix composites stirring casting forming technology mechanical property

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Preparation and microstructure characterization of self-scattered SiNWs powders

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Gongneng Cailiao/Journal of Functional Materials 2015年第19期46卷 19126-19130页

作者： Zhang, Xia Chen, Shaoping Fan, Wenhao Wang, Yankun Meng, Qingsen Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education Taiyuan University of Technology Taiyuan China College of Material Science and Engineering Taiyuan University of Technology Taiyuan China

Silicon and Ni(NO3)2·6H2O were used as raw materials to prepare nickel coated silicon powder, and then “self-scattered” silicon nano wires (SiNWs) were formed by interface eutectic reaction between silicon and nickel. The “self-scattered” SiNWs can be easily mixed with different materials to form composites without twining and agglomeration which are typical problems of traditional nanowires. It's indicated that both molar ratio of Si to Ni and silicon particle size have important influence on growth kinetics of SiNWs including the coating appearance and quantity of SiNWs. When the particle size of silicon was 74 μm, 80% of the mixture grew into linear SiNWs through annealing at 950 for 120 min with a molar ratio of n(Si):n(Ni)=2:*** the silicon was further ball milled into nano particles (around 100 nm), the Si-centered self-scattered SiNWs growing in radial were formed and each single SiNWs was about 150 nm in diameter and 1.5 μm in length. © 2015, Chongqing Functional Materials Periodical Press Co. Ltd. All right reserved.

关键词： Silicon

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Synthesis and application of 1, 3, 5-triazine-based intumescent flame retardants

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Gongneng Cailiao/Journal of Functional Materials 2015年第12期46卷 12001-12008页

作者： Ma, Li Ge, Weijuan Zhang, Jinkai Yan, Hong Wei, Liqiao Xu, Bingshe Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education Taiyuan University of Technology Taiyuan China College of Materials Science and Engineering Taiyuan University of Technology Taiyuan China

1, 3, 5-triazine-based intumescent flame retardants exhibit excellent potential applications in the field of halogen-free retarded polymers, owing to their good characteristics like smoke suppression, low toxicity, no corrosion, high flame retardant efficiency, etc. Their recent researches and developments were reviewed on the synthesis and application of 1, 3, 5-triazine-based intumescent flame retardants, the compounds/derivatives based on melamine and cyanuric chloride. Finally, the developing trend of 1, 3, 5-triazine-based intumescent flame retardants was prospected. ©, 2015, Journal of Functional Materials. All right reserved.

关键词： Chlorine compounds

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Current investigation of doping modification of PZT

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Gongneng Cailiao/Journal of Functional Materials 2015年第4期46卷 04009-04015页

作者： Liu, Zhe Xing, Zhi-Guo Wang, Hai-Dou Xu, Bin-Shi Jin, Guo Institute of Surface/Interface Science and Technology School of Materials Science and Chemical Engineering Harbin Engineering University Harbin China National Key Laboratory for Remanufacturing Armored Forces Engineering Institute Beijing China

As one of a typical perovskite structure. PZT provide a wide flexibility for doping modification. The paper have introduced the current investigation of PZT-doping modification and briefly analyzed the variation of property which affected by equivalent doping, donor doping, acceptor doping and multiple doping respectively The theory of doping modification has been discussed by two aspects: crystal structure and domain structure effected by doping, which will provide theoretical base of doping. ©, 2015, Journal of Functional Materials. All right reserved.

关键词： Crystal structure

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