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中国材料大会2012

作者： Junyan Wu Fei Chen Qiang Shen Lianmeng Zhang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Key Laboratory of Advanced Technology for Specially Functional Materials Ministry of Education Wuhan University of Technology

ISBN: (纸本)9783037856079;3037856076

Antimony-doped tin oxide (ATO) nanoparticles with controlled doping level were prepared by a nonaqueous solution route, using alcohol as the solvent, citric acid as an agent, tin (IV) tetrachloride as tin source and antimony (III) chlorideas as antimony sources. As-synthesized samples were characterized by Thermogravimetric analysis (TGA), powder X-ray diffraction (XRD), transmission electron micrographs (TEM), N2 adsorption-desorption isotherms, and X-ray photoelectron spectroscopy (XPS). The results showed that the content of citric acid was the most important processing parameter which was largely governing the reaction course and the complete incorporation of Sb. When the citric acid to metal mol ratio was 2, the particles were the highly crystallized ATO nanoparticles of about 20nm and the Sb atoms were indeed incorporated into the SnO2 crystal structure (cassiterite SnO2 ).

关键词： Antimony-doped tin oxide nanoparticle, Controlled doping level, Nonaqueous sol-gel.

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Preparation and Oxidation of ZrB2/SiC/Zr2Al4C5 Multi-phase Ceramics with Spark Plasma Sintering

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Journal of Physics: Conference Series 2013年第1期419卷

作者： Qilong Guo Junguo Li Zhiyu Ma Ye Nie Qiang Shen Lianmeng Zhang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 People's Republic of China Sinoma International Engineering CO. Ltd.(Nanjing) 106 Jiangjun avenue Nanjing Jiangsu 211100 China

The ZrB2/SiC/Zr2Al4C5 multi-phase ceramics were fabricated by spark plasma sintering (SPS) at 1800 °C for 3 min under 20 MPa in an vacuum. Oxidation behavior of multi-phase ceramics were investigated using thermo gravimetric analysis (TGA) from 20 °C to 1500 °C and muffle furnace in stagnant air at 1200 °C. Samples were analyzed after oxidation by X-ray diffraction (XRD), scanning electron microscopy (SEM) along with energy dispersive spectroscopy (EDS) to determine the reaction products and to observe the microstructure. The results showed that the aluminium borate and mullite crystallize on the surface in the samples oxidized. The effect of Zr2Al4C5 content on the oxidation resistance of the ZrB2 ceramics were discussed respectively, and oxidation mechanism was also analysised.

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Fabrication and Mechanical Properties of SiC/Cu Composites with Zn Addition by Hot Pressing Sintering

Fabrication and Mechanical Properties of SiC/Cu Composites w...

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中国材料大会2012

作者： Huang Liu Guoqiang Luo Pingan Chen Qiang Shen Lianmeng Zhang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Key Laboratory of Advanced Technology for Specially Functional Materials Ministry of Education Wuhan University of Technology

ISBN: (纸本)9783037856079;3037856076

SiC/Cu composites exhibit low density, low coefficient of thermal expansion and excellent mechanical properties. In this study, Zn of 2 wt. % was added as the sintering activator, and the high volume faction (60%) SiC/Cu composites was fabricated by hot pressing sintering technology. The phase composition and morphology of as-prepare samples were characterized by X-ray diffraction (XRD) system and scanning electron microscopy (SEM) equipped with an energy-dispersive spectroscopy (EDS) system. The as-prepared SiC/Cu composites were dense and uniform as well as void free. The results show that SiC/Cu composites can reach excellent mechanical properties of SiC/Cu composites. With the increase of sintering temperature, Vickers hardness and the bending strength of the samples increased obviously and the as-prepared SiC/Cu composites achieved a maximum Vickers hardness and bending strength respectively of 195MPa and 140MPa.

关键词： SiC/Cu Composite, Hot pressing sintering, Mechanical properties, Interface.

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Methyl Halide to Olefins and Gasoline over Zeolites and SAPO Catalysts：A New Route of MTO and MTG

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催化学报 2012年第1期33卷 11-21页

作者： WEI Yingxu ZHANG Dazhi LIU Zhongmin SU Bao-Lian Dalian National Laboratory for Clean Energy National Engineering Laboratory for Methanol-to-OlefinsDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 0LiaoningChina Laboratory of Inorganic Materials Chemistry(CMI) University of Namur(FUNDP)61rue de BruxellesB-5000NamurBelgium State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina

到更有用的更高的烃的甲烷的合理、有效的变换是天然气利用的最重要的话题之一。尽管到珍贵混合物的甲烷激活和它的变换吸引增加的注意，甲烷变换经常为 syngas 通过消费精力的步以间接方法被做从甲烷改过的蒸气的生产。一些有希望的结... 详细信息

到更有用的更高的烃的甲烷的合理、有效的变换是天然气利用的最重要的话题之一。尽管到珍贵混合物的甲烷激活和它的变换吸引增加的注意，甲烷变换经常为 syngas 通过消费精力的步以间接方法被做从甲烷改过的蒸气的生产。一些有希望的结果看起来为从甲烷的高增值产品的生产具有为一种选择和潜在的线路的发展的意义。到更高的烃的甲烷的有效变换能作为中介经由甲基卤化物被认识到。在 halomethane 的生产以后，他们能在修改沸石和 SAPO 上被转变到汽油和轻石蜡分子的筛。高变换效率和选择显示了工业申请的可行性。研究在基本研究和工业申请从观点获得了最近成长的兴趣。反应机制上的学习从甲基卤化物使 CC 契约建设的可能的线路清楚些，它是到更高的烃的 C1 反应物变换的重要问题。氢卤化物产生没在反应机制和催化剂的结构稳定性上在甲基卤化物变换期间施加明显的影响。这评论处理这个领域和注释的进化要探索的优点和缺点经由甲基卤化物发送为新、持续的 methane-to-olefins (MTO ) 和 methane-to-gasoline (MTG ) 的开发被阻止。

关键词： methyl halides hydrocarbons zeolite SAPO-34 reaction mechanism

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Photocatalytic Degradation of *** Membrane Cell in the Presence of ZnO Nanowires

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Journal of Wuhan University of technology(materials Science) 2011年第2期26卷 223-226页

作者：王雪飞刘鹏 Department of Chemistry School of ScienceWuhan University of Technology State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

The photocatalytic degradation of *** membrane cell by ZnO nanowires was studied using field-emission scanning electron microscope（FE-SEM）,fluorescence microscopy,and Attenuated total reflection fourier transform infrared（ATR-FTIR）.The outer membrane of *** was removed completely in the presence of ZnO nanowires under UV irradiation,and the cells became twisted shapes without a mechanically strong *** ZnO nanowires photocatalysis,the permeability of the treated cells increased to some degree that could be confirmed by quantum dots lab.ling *** changes in the cell wall membrane were revealed by the decay of the characteristic groups bands in ATR-FTIR spectra.

关键词： photocatalysis E.coli ZnO nanowire permeability

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Photocatalytic Activity of Hierarchical Flower-Like TiO_(2) Superstructures with Dominant {001} Facets

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催化学报 2011年第4期32卷 525-531页

作者： XIANG Quanjun YU Jiaguo State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeLChina

The fabrication of well defined hierarchical structures of anatase TiO_(2) with a high percentage of reactive facets is of great importance and *** flower-like TiO_(2) superstructures(HFTS)self-assembled from anatase TiO_(2) nanosheets with exposed{001}facets(up to 87%)were synthesized by a simple alcohothermal strategy in a HF-H_(2)O-C_(2)H_(5)OH mixed solution using titanate nanotubes as *** samples were characterized by X-ray diffraction,scanning electron microscopy,transmission electron microscopy,and N2 adsorption-desorption *** photocatalytic activity was evaluated by the photocatalytic oxidation decomposition of acetone in air and methyl orange in aqueous solution under UV *** photocatalytic activity of HFTS was much higher than that of commercial Degussa P25 and tabular-shaped anatase TiO_(2) obtained using pure water as the synthesis *** enhancement in photocatalytic activity was related to several factors,including the hierarchically porous structure,exposed{001}facets,and increased light harvesting *** HFTS was also of interest for use in solar cells,photocatalytic H_(2) production,optoelectronic devices,sensors,and catalysis.

关键词： titanium dioxide {001}facet hierarchical flower-like titanium dioxide superstructure photocatalytic activity acetone methyl orange

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The effect of dispersion of TiO2 nanoparticles on preparation of flexible dye-sensitized photoanodes

The effect of dispersion of TiO2 nanoparticles on preparatio...

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作者： Zhao, Xiao Chong Lin, Hong Liu, Yizhu Li, Xin Yang, Pan Chen, Huiyuan Y. Wang, Gang Li, Jian Bao State Key Laboratory of New Ceramics and Fine Processing Department of Material Science and Engineering Tsinghua University Beijing 100084 China Pen-Tung Sah Micro-Nano Technology Research Center Xiamen University Xiamen 361005 China Tianjin Institute of Power Sources Tianjin 300381 China School of Mechanical Engineering Qinghai University Xining 810016 China Key Lab. for Hainan Advantage Rsrc. and Appl. Technol. in Chem. Eng. Mat. of Ministry of Education Materials and Chemical Engineering Institute Hainan University Haikou 570228 China

Generally, nanoparticles are easy to aggregate due to their nano sizes, which influence the physical and chemical properties. In this work, a dispersion treatment of the TiO2 nanoparticles with different average sizes was employed to improve the dispersion of TiO2 nanoparticles, in order to prepare flexible photoanodes for dye-sensitized solar cells (DSCs) with novel photovoltaic properties at a low temperature. The effects of dispersion treatment on the dispersion of TiO2 nanoparticles, including the viscosities of the binder-free TiO2 paste, the morphologies and textural properties of nanoparticle-TiO2 films, and the photovoltaic properties of the flexible DSCs, were investigated. Flexible indium-tin oxide (ITO)-coated polyethylene naphthalate (PEN) substrates with sputter deposited Pt were employed as the transparent flexible counter electrodes. A short-circuit photocurrent density of 9.62 mA cm-2, an open-circuit voltage of 0.757 V, a fill factor of 0.589 and an overall light-to-energy conversion efficiency of 4.29% for the flexible DSCs under AM1.5 illumination of 100 mW-cm?2 were obtained with dispersion treatment. A 30.8% increment of the energy conversion efficiency for DSCs made by dispersion treatment was obtained compared with that made without dispersion treatment. © 2012 Science China Press and Springer-Verlag Berlin Heidelberg.

关键词： Dye-sensitized solar cells

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Micro forward extrusion of a Zr-based bulk metallic glass in its supercooled liquid region

Micro forward extrusion of a Zr-based bulk metallic glass in...

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10th International Conference on technology of Plasticity, ICTP 2011

作者： Zheng, Z.Z. Wang, Y. Wang, X.Y. Li, J.J. Liu, L. State Key Lab. of Material Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783514007840

Micro forward extrusion experiments have been carried out using various sizes of dies to investigate the effects of specimen dimension and die length and also to obtain the characteristics of material flow during the extrusion of Zr55Cu30Ni5Al10 bulk metallic glass at temperatures within the supercooled liquid region (SLR). The results indicated that the pressure-stroke curves can be divided into three different stages. With the decrease in specimen size, the unit pressure increased and the tendency of forming load changed as well. Finally, when a short length extrusion die was used, specimens were found to swell after extrusion. The characteristics of the material flow changed and the flow stress rapidly increased after a specimen was extruded out from die exit. The finite element analysis (FEM) was also performed by using the constitutive equations, previously developed by the authors. The results showed that the size effect of micro forward extrusion could not be simulated in the present FEM analysis. © 2011 IBF (RWTH Aachen) & IUL (TU Dortmund).

关键词： Extrusion

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Fabrication of translucent boron nitride dispersed polycrystalline silicon nitride ceramics

Fabrication of translucent boron nitride dispersed polycryst...

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International Symposium on Multifunctional Ceramic materials Based on Nanotechnology, ISMCN 2010

作者： Joshi, B. Fu, Z. Niihara, K. Lee, S.W. Department of Metallurgy and Material Engineering Sunmoon University Korea Republic of State Key Lab. of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology China Nagaoka University of Technology Nagaoka Japan Department of Environment Engineering Sunmoon University Asan Korea Republic of

Optical transparency was achieved at infrared region and overall translucent silicon nitride was fabricated using hot press sintering (HPS). The increase in h-BN content decreased the optical transparency. Microstructral observations shows that the optical, mechanical and tribological properties of BN dispersed polycrystalline Si3N4 ceramics were affected by the density, α:β-phase ratio and content of h-BN in sintered ceramics. The hot pressed samples were prepared from the mixture of α-Si3N4, AlN, MgO and h-BN at 1850°C. The composite contained from 0.25 to 2 mass % BN powder with sintering aids (9% AlN + 3% MgO). Maximum transmittance of 57% was achieved for 0.25 mass % BN doped Si3N4 ceramics. Fracture toughness was increased and wear volume and friction coefficient were decreased with increase in BN content.

关键词： III-V semiconductors

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Effect of pre-forming condition on flow behaviour of 4032 aluminium alloy

Effect of pre-forming condition on flow behaviour of 4032 al...

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10th International Conference on technology of Plasticity, ICTP 2011

作者： Deng, L. Wang, X.Y. Jin, J.S. Xia, J.C. Li, J.J. State Key Lab. of Material Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783514007840

The effects of pre-forming conditions, such as temperature and strain, on flow behaviour and material constant of constitutive equation were presented to achieve a quantitative relationship between pre-forming condition and material constant of hyperbolic sine type constitutive model. Isothermal extrusion process of 4032 aluminium alloy was carried out with different temperatures and strains. T6 temper process was carried out for extrusion aluminium bars before compression at elevated temperature. Isothermal compression experiment was carried out with Zwick/Roell Z020 universal testing machine. While the compression parameters are the same, the peak stresses of specimens preformed with different conditions decrease with the increase of extrusion temperature, and increase with the increase of strain below strain 1.2. The hyperbolic sine type constitutive models were obtained, and the material constants, such as activation energy and stress exponent, were identified by regression analysis based on results of compression experiment. The quantitative relationship between activation energy, stress exponent and pre-forming conditions was obtained by polynomial fitting. These equations would be applied in numerical solution procedure for discontinuous multistage metal forming. © 2011 IBF (RWTH Aachen) & IUL (TU Dortmund).

关键词： Strain

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