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9th China International Conference on High-Performance Ceramics, CICC 2015

作者： Xu, Minghan Song, Jieguang Wang, Ruihua Li, Shibin Wang, Ning Yu, Siyuan Yan, Hanxing Xia, Tingting Chen, Fei Engineering and Technology Research Center for Materials Surface Remanufacturing of Jiangxi Province School of Mechanical and Materials Engineering Jiujiang University Jiujiang332005 China State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9783035710656

Yttrium aluminum garnet (YAG) with a chemical composition of Y3Al5O12 is an important advanced structural and functional material due to some excellent properties. The porous YAG ceramics were prepared via vacuum sintering technology, the effect of sintering aids on the properties of porous YAG ceramics were investigated in this paper. Through an analysis and discussion, the conclusions are that the porosity increases with the increasing sintering temperature from 1300°C to 1500°C, the pore is moved to the surface of sample, which forms the open pore to make the porosity increase, the more and bigger sintering neck is increased. Porous YAG ceramics are sintered at 1500°C, the regular outside shapes of porous YAG ceramic are kept using CaO and MgO as sintering aids, the outside shape of porous YAG ceramic is wrecked using Al2O3 as sintering aids, which shows the over fired phenomenon. © 2016 Trans Tech Publications, Switzerland.

关键词： Yttrium aluminum garnet

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Fabrication of morphology controllab.e vertically aligned TiO2 nanorod arrays for dye-sensitized solar cells 6th

Fabrication of morphology controllable vertically aligned Ti...

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6th Annual Meeting on Testing and Evaluation of advanced materials, TEIM 2015

作者： Li, Fen Hu, Sujuan Wei, Lidong Chi, Bo Jian, Li Center for Fuel Cell Innovation School of Materials Science and Engineering State Key Lab. of Material Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9783038357278

In this work, vertically aligned TiO2 nanorod arrays (NR) are synthesized directly on FTO coated glass substrate by hydrothermal method. The samples are characterized by XRD, SEM, TEM and the results indicate that the 1-D nanorods are of single crystal rutile structure with growth direction along the [001] direction. The morphology (diameter, thickness and density) of the nanorods can be adjusted by changing the precursor amounts. The possible growth mechanism of TiO2 nanorods on FTO substrate has also been briefly discussed in this work. For dye-sensitized solar cells (DSSCs) fabricated of different thickness nanorods, a power conversion efficiency (PCE) of 1.74% has been achieved by using ∼3 μm nanorod arrays under simulated AM 1.5 illumination (100 mW cm-2). It is expected that the 1-D nanorods can be composited with other nanomaterial of different structures and morphologies to enhance the efficiency of DSSCs. © 2016 Trans Tech Publications, Switzerland.

关键词： Titanium dioxide

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Uncovering the influence of common nonmetallic impurities on the stability and strength of a Σ5 (310) grain boundary in Cu

arXiv

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arXiv 2017年

作者： Huang, Zhifeng Chen, Fei Shen, Qiang Zhang, Lianmeng Rupert, Timothy J. State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Mechanical and Aerospace Engineering University of California IrvineCA92697 United States Department of Chemical Engineering and Materials Science University of California IrvineCA92697 United States

Impurities are often driven to segregate to grain boundaries, which can significantly alter a material's thermal stability and mechanical behavior. To provide a comprehensive picture of this issue, the influence of a wide variety of common nonmetallic impurities (H, B, C, N, O, Si, P and S) incorporated during service or materials processing are studied using first-principles simulations, with a focus on identifying changes to the energetics and mechanical strength of a Cu Σ5 (310) grain boundary. Changes to the grain boundary energy are found to be closely correlated with the covalent radii of the impurities and the volumetric deformations of polyhedra at the interface. The strengthening energies of each impurity are evaluated as a function of covalent radius and electronegativity, followed by first-principles-based tensile tests on selected impurities. The strengthening of a B-doped grain boundary comes from an enhancement of the charge density among the adjacent Cu atoms, which improves the connection between the two grains. Alternatively, the detrimental effect of O results from the reduction of interactions between the Cu atoms. This work deepens the understanding of the possible beneficial and harmful effects of impurities on grain boundaries, providing a guide for materials processing studies. Copyright © 2017, The Authors. All rights reserved.

关键词： Grain boundaries

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Smart Robots: Self‐Propelled 3D‐Printed “Aircraft Carrier” of Light‐Powered Smart Micromachines for Large‐Volume Nitroaromatic Explosives Removal (Adv. Funct. Mater. 39/2019)

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advanced Functional materials 2019年第39期29卷

作者： Lei Kong Adriano Ambrosi Muhammad Zafir Mohamad Nasir Jianguo Guan Martin Pumera Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi road Wuhan 430070 P. R. China Department of Inorganic Chemistry University of Chemistry and Technology Prague Technická 5 166 28 Prague 6 Czech Republic Future Energy and Innovation Lab Central European Institute of Technology Brno University of Technology Purkyňova 656/123 Brno CZ‐616 00 Czech Republic Department of Chemical and Biomolecular Engineering Yonsei University 50 Yonsei‐ro Seodaemun‐gu Seoul 03722 Korea

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Ammonium [email protected] @manganese dioxide nanowire arrays with enhanced reversible lithium storage

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Applied Surface Science 2017年 416卷 402-410页

作者： Chang Wang Hui Liu Ming Jiang Yingde Wang Ruina Liu Zhiping Luo Xiaoqing Liu Weilin Xu Chuanxi Xiong Dong Fang College of Material Science and Engineering State Key Lab for New Textile Materials & Advanced Processing Technology Key Laboratory for New Textile Materials and Applications of Hubei Province Wuhan Textile University Wuhan 430070 PR China School of Metallurgy and Environment Central South University Changsha 410083 PR China Science and Technology on Advanced Ceramic Fiber and Composites Laboratory National University of Defense Technology Changsha 410073 PR China Department of Chemistry and Physics Fayetteville State University Fayetteville NC 28301 USA School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 PR China

Design and fabrication of novel optimized electrode materials are important for the development of new batteries for energy storage applications. Herein, we report on a hierarchical bulk electrode material with a tailored nanostructure that which consists of three components: a NH 4 V 4 O 10 nanowire as an active skeleton, an intermediate polymer layer (polypyrrole, PPy), and a metal oxide layer (MnO 2 ) as the outside shell. The NH 4 V 4 O 10 -PPy-MnO 2 nanowires exhibit present higher capacitance than that of the simple NH 4 V 4 O 10 -PPy [email protected] or NH 4 V 4 O 10 nanowires. The structure of double shells of combined PPy and MnO 2 is a key factor in enhancing their electrochemical performance including high specific capacitance and excellent cycling stability. Our V-based [email protected] @shell structure can serve as freestanding, compressible electrodes for various energy devices.

关键词： Ammonium vanadate Nanowire array [email protected] @shell structure Lithium ion battery

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Mechanical Properties and Fracture Behaviour of Multilayer Alumina Composites

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Journal of Wuhan University of technology(materials Science) 2015年第5期30卷 965-967页

作者：郑新国 ZHAO Fei 张金咏 Railway Engineering Research Institute of China Academy of Railway Science State Key Lab of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

Adopting a ceramic/polymer multilayer structure design to simulate the structure of nacre is usually believed to be an effective way to increase the toughness of ceramic composites at the expense of the material’s bending strength. However, in this study, we found that both the bending strength and the toughness could be improved simultaneously when using a certain Al2O3/Kevlar multilayer composite design compared to pure alumina samples with the same dimensions. The fracture behaviour of the Al2O3/Kevlar multilayer composite was studied to find a reason for this improvement. The results showed that the complex and asymmetrical stresses occurring in the Kevlar-reinforced layers were the main reason for the differences in fracture behaviour. We expect our results to open up new ways for the design of future high performance ceramic composites.

关键词： biomaterials alumina multilayer composite toughening

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Preparation of Nano-sized Zirconium Carbide Powders through a Novel Active Dilution Self-propagating High Temperature synthesis Method

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Journal of Wuhan University of technology(materials Science) 2015年第4期30卷 729-734页

作者：达奥运龙飞 WANG Jilin XING Weihong WANG Yang ZHANG Fan 王为民 FU Zhengyi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Key Lab of New Processing Technology for Nonferrous Metals & Materials Ministry of Education China Guilin University of Technology

High quality nano-sized zirconium carbide （ZrC） powders were successfully fabricated via a developed chemical active dilution self-propagating high-temperature synthesis （SHS） method assisted by ball milling pretreatment process using traditional cheap zirconium dioxide powder （ZrO2）, magnesium powder （Mg） and sucrose （C12H22Oll） as raw materials. FSEM, TEM, HRTEM, SAED, XRD, FTIR and Raman, ICP- AES, laser particle size analyzer, oxygen and nitrogen analyzer, carbon/sulfur determinator and TG-DSC were employed for the characterization of the morphology, structure, chemical composition and thermal stability of the as-synthesized ZrC samples. The as-synthesized samples demonstrated high purity, low oxygen content and evenly distributed ZrC nano-powders with an average particle size of 50nm. In addition, the effects of endothermic rate and the possible chemical reaction mechanism were also discussed.

关键词： zirconium carbide ZrC self-propagating high-temperature synthesis active dilution nano-powders ball milling

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In-situ Preparation of TiB_2-TiB-Ti Functionally Graded materials by Improved Sintering Process

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Journal of Wuhan University of technology(materials Science) 2015年第4期30卷 710-714页

作者：刘国玺 LI Kezhi ZHANG Jinyong 张帆 School of Materials Science Northwestern Polytechinical University Ningbo Branch of Ordnance Science Institute of China State Key Lab of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

An improved multi-step sintering process was used to in-situ prepare TiB2-TiB-Ti FGMs. According to the sintering temperatures, the functionally graded materials （FGMs） were divided into three sections. After sintering at a proper temperature, the three sections were sintered together in turn. The experimental results showed that there were no obvious pores and cracks in the whole TiB2-TiB-Ti FGMs, and no delamination was found in the impacting test with good performance features, which indicated that there were no interface effects in FGMs during penetration, so that the TiB2-TiB-Ti FGMs were an ideal FGM.

关键词： FGMs TiB2 Ti Fabrication

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Room temperature growing the Kagomé net Pillared crystal structure of metal-organic frameworks

Room temperature growing the Kagomé net Pillared crystal st...

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The 3rd International Congress on advanced materials（AM2016）

作者： Kui Zhou Somboon Chaemchuen Zhaoxuan Wu Francis Verpoort School of Materials Science and Engineering Wuhan University of Technology State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

The rapid synthesis of Kagomé net layer pillared metal organic frameworks(MOFs) structure at room temperature was developed. Although this MOF series [M(bdc)(dabco)] varies in metal center(M= Co, Ni, Zn), the structure remains [the MOF is denoted as MBD;M = metal(Co, Ni, Zn);B = bdc(1,4-bicarboxylic acid);D = dabco(1,4-diazabicyclo[2.2.2]octane)]. The Kagomé net pillared structures are determined using comparable XRD patterns and confirmed by SEM. N adsorption isotherms at 77 K are used to evaluate their surface area and porosity properties. Furthermore, the gas uptake analyses(CO, CH and N) were measured at different temperatures and pressure up to 1 bar. Additionally, the heats of adsorption behavior of CO are given by fitting the isotherms with Dual-site Langmuir equations. Finally, the CO/CH and CO/N selectivities are determined by Ideal Adsorbed Solution Theory(IAST) to evaluate the gas separation properties of these materials.

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Study on the Pyrolysis Behavior of Polycarbosilane

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Journal of Wuhan University of technology(materials Science) 2015年第4期30卷 679-683页

作者：陈文怡 ZHOU Jian Materials Research and Testing Center Wuhan University of Technology State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

The pyrolysis behavior of polycarbosilane （PCS） and chemical reaction mechanism during the pyrolysis process were studied by thermogravimetric-mass spectrometry （TG-MS） combined with X-ray diffraction and infrared spectroscopic analysis methods. The experimental results indicate that the main gas phase products generated during pyrolysis of PCS in nitrogen atmosphere include H2, -CH3 and CH4. The heating rate has a large effect on the pyrolysis process of PCS, the lower heating rate releases more small molecule gases and gets bigger rate of pyrolysis mass loss, demonstrating that the lower heating rate is beneficial to fully pyrolysis of PCS and obtain ceramics products with better microstructure.

关键词： polycarbosilane pyrolysis behavior thermogravimetric-mass spectrometry heating ratemass loss

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