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Effect of oxygen partial pressure on the composition and structure of GdBa2Cu3O7-δ by solid state reaction

materials Research Innovations 2015年 19卷 21-25页

作者： Tu, R. Ke, W. Zhang, S. Wang, T. Zhang, L.M. Goto, T. State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan430070 China Institute for Materials Research Tohoku University 2-1-1 Katahira Aobaku Sendai980-8577 Japan

GdBa2Cu3O7-δ (GdBCO or Gd123) ceramics have been successfully prepared at oxygen partial pressure (PO2) of 0.02-0.10 MPa via solid state reaction method by using Gd2O3, BaCO3 and CuO powders as raw materials, whereas GdBa2Cu3O7-δ decomposed to Gd2BaCuO5 (Gd211), Gd2O3 and barium copper oxides owing to the instability of GdBa2Cu3O7-δ at PO2 = 0 MPa according to the stability phase diagram of GdBa2Cu3O7-δ. Effect of PO2 on the phase structure and microstructure of GdBa2Cu3O7-δ has been investigated by X-ray diffractometer and fieldemission scanning electron microscopy methods. Composition and microstructure of pellets sintered at PO2 = 0 MPa were totally different from pellets sintered at PO2 ≥ 0.02 MPa. © 2015 W. S. Maney & Son Ltd.

关键词： Oxygen

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Effect of the SiC Content on Microstructures and Mechanical Properties of Al-7075/SiC Composites by Hot-press Sintering

Effect of the SiC Content on Microstructures and Mechanical ...

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2015 4th International Conference on materials Engineering for advanced Technologies(ICMEAT 2015)

作者： Cheng Chen Simin Chen Jialu Wu Chuandong Wu Pan Fang Meijuan Li Guoqiang Luo State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology State Grid Electric Power Research Institute Co. Ltd.Wuhan NARI

In this paper, Al-7075/Si C composites with 5, 10, 15 and 20 wt.% Si C were fabricated by hot-press sintering in vacuum at 610 °C followed by heat treatment. X-ray diffraction(XRD) and Field-emission scanning electron microscopy(FESEM) were used to characterize the microstructures of the Al-7075/Si C composites. The results revealed that Al-7075/Si C composites can be fabricated by hot-press sintering with high relative density. Increasing the content of Si C led to higher Vickers' hardness and augmentation of the tensile strength of Al-7075/Si C composites. At 20 wt.% Si C, the Vickers' hardness and tensile strength achieved as high as 183 HV and 470 MPa, respectively.

关键词： Al-7075/Si C composites Si C content Hot-pressing sintering Microstructures Mechanical properties

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Heat resistance properties of an cured ATPU/epoxy resin

Heat resistance properties of an cured ATPU/epoxy resin

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2014 Dianchi advanced materials Forum

作者： Chen, Wen Yi Guan, Jian Guo Materials Research and Testing Center Wuhan University of Technology Wuhan China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

ISBN: (纸本)9783038353348

Thermogravimetry (TG-DTA) method was used to study the heat resistance properties and the thermal decomposition kinetics of the aromatic amine-terminated polyurethane (ATPU)/Epoxy Resin System (E-44) which includes both flexible chains and rigid structural units. The results indicate that the decomposition temperature of the cured ATPU-2/E-44 is higher than that of the cured ATPU-1.5/E-44, and thermal decomposition residual of cured ATPU-2/E-44 is higher than that of cured ATPU-1.5/E-44 system. These results denote that the cured ATPU-2/E-44 has better heat resistance. The results of decomposition kinetics showed that the decomposition reaction activity of the ATPU-2/E-44 system is higher than that of ATPU-1.5/E-44. © (2014) Trans Tech Publications, Switzerland.

关键词： Polyurethanes

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Preparation and properties of YAG powder and porous ceramics

Preparation and properties of YAG powder and porous ceramics

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2014 Dianchi advanced materials Forum

作者： Zhao, Wen Bo Liang, Xin Hu, Fa Mei You, Liang Liang Ma, Bo Feng Wang, Ruo Lan Liu, Hong Ying Yang, Guo Sheng Tan, Bin Song, Jie Guang Wang, Fang Chen, Fei School of Mechanical and Materials Engineering Jiujiang University Jiujiang China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

ISBN: (纸本)9783038353348

Yttrium aluminum garnet (YAG) with a chemical composition of Y3Al5O12 is an important advanced structural and functional material. The preparation conditions were a pH of 9, a titration rate of lOml/minute and a reaction time of 60 minutes. The analysis shows that the YAG precursor does not have an obvious characteristic crystalline diffraction peak, the characteristic diffraction peak of YAG was found after the calcination of the YAG precursor at 1100°C for 1 hour, the characteristic diffraction peak of YAG is strong, which indicates that the YAG crystalline phase is integrated and pure. The pore microstructure of porous YAG ceramics marked differed with an increase in the sintering temperature, the compress strength of porous YAG ceramics is increased with an increase in the sintering temperature, the compress strength shows the opposite rule with the porosity, which indicates the mechanical properties of materials are effected with the densifìcation effect of materials. © (2014) Trans Tech Publications, Switzerland.

关键词： Yttrium aluminum garnet

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Effect of pH value on the properties of SnO2 nano-cystalline for dye sensitized solar cells 5

Effect of pH value on the properties of SnO2 nano-cystalline...

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5th Annual Meeting on Testing and Evaluation of Inorganic materials, TEIM 2014

作者： Song, Jieguang Hua, Lin Shen, Qiang Wang, Fang Zhang, Lianmeng Hubei Key Lab of Advanced Technology of Automotive Components School of Automotive Engineering Wuhan University of Technology Wuhan430070 China State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Materials Engineering Jiujiang University Jiujiang Jiangxi332005 China

ISBN: (纸本)9783038353331

The study of dye-sensitized solar cells (DSCs) based on nano-crystalline films of high band gap semiconductors is a progressive field of research that is being carried out by scientists in a wide range of lab.ratories. To improve the conversion efficiency of the DSCs, the SnO2 nanorots photocurrent is prepared via the hydrothermal method, and characterized by XRD, FESEM, BET and Absorption spectrum. Though analysis the results, the conclusion is shown the pure SnO2 is preparation, the SnO2 nano-crystalline both shows the single phase that SnO2 from the sule solution to kalin solution. The prepared SnO2 nano-crystalline under pH=3 shows the particle-shape crystalline, the surface area of SnO2 nano-crystalline is 86.3412m2/g. The prepared SnO2 nano-crystalline under pH=7 shows the short rod-shape crystalline, the surface area of SnO2 nano-crystalline is 58.3408m2/g. The absorbance of SnO2 nano-crystalline shows the strong absorption in the ultraviolet ray range, the absorbance of synthesized SnO2 nano-crystalline under pH=11 shows the highest value. © (2015) Trans Tech Publications, Switzerland.

关键词： Dye-sensitized solar cells

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Effect of controlling concentration on the properties of SnO2 nanocystalline for dye sensitized solar cells

Effect of controlling concentration on the properties of SnO...

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2014 Dianchi advanced materials Forum

作者： Song, Jie Guang Hua, Lin Shen, Qiang Wang, Fang Zhang, Lian Meng Hubei Key Lab of Advanced Technology of Automotive Components School of Automotive Engineering Wuhan University of Technology Wuhan China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Department of Materials Engineering Jiujiang University JiujiangJiangxi China

ISBN: (纸本)9783038353348

The study of dye-sensitized solar cells (DSCs) based on nano-crystalline films of high band gap semiconductors is a progressive field of research that is being carried out by scientists in a wide range of lab.ratories. To improve the conversion efficiency of the DSCs, the SnO2 nanorots photocurrent, the effect of controlling concentration on the propertiesof SnO2 nano-crystalline were investigated via the hydrothermal method, and characterized by XRD, HRTEM, BET and Absorption spectrum. Though analysis the results, the conclusion is shown the pure SnO2 is preparation, the prepared SnO2 nano-crystalline under 0.05mol/L shows the particle-shape crystalline, the surface area of SnO2 nano-crystalline is 102.1683m2/g. The prepared SnO2 nano-crystalline under 1mol/L the fiber-shape crystalline, the surface area of SnO2nano-crystalline is 79.7591m2 /g. The absorbance of SnO2 nano-crystalline shows the strong absorption in the ultraviolet ray range, the absorbance of synthesized SnO2 nano-crystalline under the concentration of SnCl4solution for 1mol/L shows the higher value. © (2014) Trans Tech Publications, Switzerland.

关键词： Dye-sensitized solar cells

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Applications of hierarchically structured porous materials from energy storage and conversion, catalysis, photocatalysis, adsorption, separation, and sensing to biomedicine

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Chemical Society reviews 2016年第12期45卷 3479-563页

作者： Ming-Hui Sun Shao-Zhuan Huang Li-Hua Chen Yu Li Xiao-Yu Yang Zhong-Yong Yuan Bao-Lian Su State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Luoshi Road 122 Wuhan 430070 China. chenlihua@*** baoliansu@***. Collaborat Innovat. Ctr. Chem. Sci. & Engn. Tianjin Key Lab. Adv. Energy Mat. Chem. Minist. Educ. Coll. Chem. Nankai Univ. Tianjin 300071 China. State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Luoshi Road 122 Wuhan 430070 China. chenlihua@*** baoliansu@*** and Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles B-5000 Namur Belgium. bao-lian.su@unamur.be and Clare Hall University of Cambridge Cambridge CB2 1EW UK. bls26@cam.ac.uk.

Over the last decade, significant effort has been devoted to the applications of hierarchically structured porous materials owing to their outstanding properties such as high surface area, excellent accessibility to active sites, and enhanced mass transport and diffusion. The hierarchy of porosity, structural, morphological and component levels in these materials is key for their high performance in all kinds of applications. The introduction of hierarchical porosity into materials has led to a significant improvement in the performance of materials. Herein, recent progress in the applications of hierarchically structured porous materials from energy conversion and storage, catalysis, photocatalysis, adsorption, separation, and sensing to biomedicine is reviewed. Their potential future applications are also highlighted. We particularly dwell on the relationship between hierarchically porous structures and properties, with examples of each type of hierarchically structured porous material according to its chemical composition and physical characteristics. The present review aims to open up a new avenue to guide the readers to quickly obtain in-depth knowledge of applications of hierarchically porous materials and to have a good idea about selecting and designing suitable hierarchically porous materials for a specific application. In addition to focusing on the applications of hierarchically porous materials, this comprehensive review could stimulate researchers to synthesize new advanced hierarchically porous solids.

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Design and Production of Filament-Wound Composite Pressure Vessels

Design and Production of Filament-Wound Composite Pressure V...

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第十一届中日复合材料学术会议（CJJCC-11）

作者： Lei Zu Jihui Wang Shuxin Li State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

One of the most important issues for the design of filament-wound pressure vessels reflects on the determination of the most efficient meridian profiles and related fiber architectures. To better understand the design and production of filament-wound pressure vessels, in this paper we present an overview and comprehensive treatment for a variety of composite pressure vessels produced using filament winding. A generalized optimality criterion that is adapted to various optimal design problems for pressure vessels is elab.rated. A new possibility to improve the vessel performance can be offered by the application of adapted cross-sectional shapes instead of the conventional shapes. The isotensoid design, which leads to equal fiber tension throughout the whole vessel, is conducted to determine the netting-based optimal cross-sectional shapes. In addition, a simplified method for designing isotensoid pressure vessels with unequal polar opening is also outlined, with the aid of non-geodesic trajectories. The optimal design, based on orthotropic plate theory, is divided into two basic approaches: numerical and semi-analytical methods. A numerical optimization method is specially designed for determining the optimal meridian profiles of bellow-shaped pressure vessels. The semi-analytical design methods are presented for the determination of the optimal meridian profiles for continuum-based domes and toroids, respectively. The optimal cross sectional shapes lead to significantly improved structural performance of filament-wound products.

关键词： Composite pressure vessels Filament winding Fiber architecture Geodesic Non-geodesic

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Design and Production of Filament-Wound Composite Pressure Vessels

Design and Production of Filament-Wound Composite Pressure V...

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The 11th China-Japan joint conference on Composite materials(第十一届中日复合材料学术会议)

作者： Lei Zu Jihui Wang Shuxin Li State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology122 Luoshi RoadWuhan 430070China

One of the most important issues for the design of filament-wound pressure vessels reflects on the determination of the most efficient meridian profiles and related iber architectures.

关键词： Composite pressure vessels Filament winding Fiber architecture Geodesic Non-geodesic

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One-pot synthesis of Hollow Octahedral Cu_2O Nanostructures at Room Temperature

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Journal of Wuhan University of technology(materials Science) 2013年第1期28卷 40-43页

作者：雷丽文 ZHANG Qi ZHANG Yu ZHANG Jinyong WANG Hao FU Zhengyi State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology School of Materials Science and Engineering Wuhan University of Technology

Homogeneous hollow Cu20 octahedral nanostructures have been fabricated by a facile onepot reduction reaction at roomtemperature. The microscope analysis revealed that the edges of as-prepared hollow structures were around 200 nm with a wall thickness of about 20 nm. To investigate the influence factors and formation mechanism of the hollow octahedral structure, samples subjected to different reaction conditions were studies. The results showed that the morphology and structures of Cu20 particles were greatly affected by the concentration of pH value of the reaction environment and the reaction time. Ostwald ripening process is orooosed to exolain the growth mechanism of the hollow octahedral nanostructures.

关键词： nanoparticles crystal growth octahedral hollow nanostructure

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