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作者： Liao, Haida Huang, Lianxiao Meng, Yanbin Wu, Bolin Zhang, Lianmeng State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Guangxi University for Nationalities Nanning 530006 China Guilin University of Technology Guilin 541004 China

α-Al2O3 nanopowders were prepared by a novel synthesis process, using the nanosized α-Al2O3 obtained from pyrolyzing ammonium aluminum carbonate hydroxide as seeds and the self-dispersed nanosized AlOOH crystal powders as precursors. Based on their good self-dispersion in water, the α-Al2O3 seeds were dispersed evenly into the AlOOH sol by the new homodispersion mixing technique. This process enables the conversion of AlOOH to alumina at 190°C (hydrothermal temperature), in which the alumina is calcined to nanosized alpha-alumina having an average length to diameter ratio of 60nm:15nm at 930°C. In the synthesis reaction for transforming the AlOOH to alumina, the effect of superfine pulverization and self-dispersion of the precursors was studied.

关键词： Aluminum compounds

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Reaction process of Al2(1-x)MgxTi1+xO 5 composite powder by chemical co-precipitation and subsequent sintering

Reaction process of Al2(1-x)MgxTi1+xO 5 composite powder by ...

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作者： Shen, Shang-Yue Yang, Rui Shen, Qiang Wang, Chuan-Bin Zhang, Lian-Meng School of Materials Science and Chemical Engineering China University of Geosciences Wuhan 430074 China State Key Lab. of Advanced Technology for Materials Synthesis Processing Wuhan University of Technology Wuhan 430070 China

Al2(1-x)MgxTi1+xO5(x=0.05-0.3) composite powder was prepared by the method of chemical coprecipitation and subsequent sintering using TiCl5, MgCl2 and AlCl 3 solution as the raw materials, and ammonia and ammonium carbonate as the solvent. Thermal dynamics and kinetic dynamics analysis of the precursor during the heat treatment were explored in detail, and the reaction process of Al2(1-x)MgxTi1+xO5(x=0.3) composite powder was confirmed. Results show that, as the temperature increases MgO reacts with TiO2 of anatase phase to form MgTi2O5. At about 650°C, anatase transfers into rutile. Then MgTi2Os reacts with Al2O3 to produce MgAl2O4 at 900°C. When the temperature is above 1100°C, the desired Al 2(1-x)MgxTi1+xO5(x=0.3) composite powder is synthesized by the reaction of MgAl2O24, Al 2O3 and TiO2 of rutile phase.

关键词： Powders

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First-principle theory study on electronic structure of Ca 3Co2O6 and Cu-doped

First-principle theory study on electronic structure of Ca 3...

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2010 International Conference on E-Product E-Service and E-Entertainment, ICEEE2010

作者： Xing, Xueling Min, Xinmin School of Material Science and Engineering Henan Polytechnic University Jiaozuo China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Techonology Wuhan China

ISBN: (纸本)9781424471614

The relation among electronic structure, chemical bond and thermoelectric property of Ca3Co2O6 and Cu-doped is studied by first-principle theory. The results indicate that the highest valence band(HVB) and the lowest conduction band(LCB) are mainly contributed from Co3d, Cu3d and O2p atomic orbitals and that 1D Co-O chains along c axis play important role in electric property of Ca3Co2O6 and Cu-doped. The property of semiconductor is shown from the gap between HVB and LCB and impurity energy level comes out after Cudoped and the gap becomes narrower which will increase the mobility of carriers and then decrease the resistivity. The metal characteristics of Cu-doped one are stronger than those of Ca 3Co2O6. The thermoelectric property should be improved from adding Cu element into the system of Ca3Co 2O6. ©2010 IEEE.

关键词： Electronic structure

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Grain boundary effects on piezoelectric properties of the core–shell-structured BaTiO_(3)@TiO_(2) ceramics

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Journal of advanced Dielectrics 2018年第6期8卷 118-126页

作者： Xixi Li Zhonghua Yao Juan Xie Zongxin Li Hua Hao Minghe Cao Amjad Ullah Atta Ullah Abdul Manan Hanxing Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan 430070P.R.China Department of Physics University of Science and Technology BannuKPKPakistan

Grain boundary effect on BaTiO_(3) has been widely investigated for several ***,all of them tailored the grain boundary by grain size of BaTiO_(3).In this case,a direct way was introduced to modify the grain boundary by coating technique to investigate the role of grain boundary in ferroelectric *** phase TiO_(2) was employed to investigate grain boundary effects on the electrical properties of BaTiO3 piezoelectric ***_(2) coating can result in the reduction of piezoelectric and ferroelectric properties and the annealing process in oxygen can increase piezoelectric behavior of pure BaTiO3 due to valence state of Ti ions while that remains for Ti-modified composition possibly due to the increased grain boundary effect by impedance *** with ferroelectric grain,grain boundary plays a critical role to impact the electrical properties of perovskite-type ferroelectric materials.

关键词： Piezoelectric properties ferroelectric properties BaTiO3 and titanates defects

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Facile one-step vulcanization of copper foil towards stable Li metal anode

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Science China materials 2020年第9期63卷 1663-1671页

作者： Danqi He Yaqi Liao Zexiao Cheng Xiahan Sang Lixia Yuan Zhen Li Yunhui Huang State Key Laboratory of Material Processing and Die and Mold Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Lithium metal has been regarded as the ultimate anode for next-generation rechargeable batteries with high energy ***,its high reactivity and dendrite growth seriously limit its commercial application,which can be well addressed by realizing uniform Li ***,we report a facile and scalab.e one-step vulcanization method to modify commercial Cu foil with lithophilic *** in situ formed Cu2S layer can not only promote the homogeneous deposition of Li via its lithophilic nature,but also benefit the formation of a stable solid-electrolyte interphase during initial *** Cu2S-modified Cu current collector realizes dendrite-free Li plating/stripping and thus exhibits stable cycling performance with a high Coulombic efficiency,even with a large capacity of 4 mA h cm^-2.A full-cell consisting of a Cu2S/Cu-Li anode and a LiFePO4 cathode exhibits greatly improved cycling stability and enhanced Coulombic efficiency,demonstrating the effectiveness and practicability of the proposed Cu2S/Cu foil in the field of rechargeable Li metal batteries.

关键词： lithium metal anode current collector lithophilic layer copper sulfide electrochemical performance

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Fast prediction of springback at product design stage for sheet metal forming

Fast prediction of springback at product design stage for sh...

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5th International Conference on Physical and Numerical Simulation of materials processing, ICPNS'07

作者： Zhibing, Zhang Yuqi, Liu Ting, Du Zhigang, Li State Key Lab. of Material Processing and Die and Mould Technology Huazhong University of Science Andtechnology Wuhan Hubei 430074 China

A novel hybrid method is proposed in the paper, which is an assistant tool for product designers to estimate springback in sheet metal forming process at the preliminary design stage. In the hybrid method, the forming results are obtained firstly by an inverse finite element approach (IA) with a membrance element. The thickness strain and stress can be calculated according to the approximate curvature radius of the discrete meshes. Then, a rotation-free shell element is employed, with only three displacements at the corner nodes of the element, to calculate the springback. To verify the accuracy and efficiency of the hybrid method, the numerical results of the hybrid method on two benchmark tests are compared with experimental results.

关键词： Product design

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Medium-entropy(Me,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)(Me=Y and Ta):Promising thermal barrier materials for high-temperature thermal radiation shielding and CMAS blocking

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Journal of materials Science & technology 2022年第28期123卷 144-153页

作者： Shuaihang Qiu Huimin Xiang Fu-Zhi Dai Hailong Wang Muzhang Huang Chunlei Wan Qing Meng Jiangtao Li Xiaohui Wang Yanchun Zhou Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials and Processing TechnologyBeijing 100076China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

With continuous enhancement of gas-turbine inlet temperature and rapid increase of radiant heat transfer,thermal barrier coating(TBC)materials with a combination of low thermal conductivity and good high-temperature thermal radiation shielding performance play vital roles in ensuring the durability of metallic ***,yttria-stabilized zirconia(YSZ),as the state-of-the-art TBC and current industry standard,is unable to meet such demands since it is almost translucent to high-temperature thermal ***,poor corrosion resistance of YSZ to molten calcia-magnesia-alumina-silicates(CMAS)also impedes its application in sand,dust,or volcanic ash laden *** order to improve the hightemperature thermal radiation shielding performance and CMAS resistance of YSZ and further reduce its thermal conductivity,two medium-entropy(ME)oxide ceramics,ME(Y,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)and ME(Ta,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2),were designed and prepared by pressureless sintering of binary powder compacts in this ***(Y,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)presents cubic structure but a trace amount of secondary phase,while ME(Ta,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)displays a combination of tetragonal phase(81.6 wt.%)and cubic phase(18.4 wt.%).Both ME(Y,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)and ME(Ta,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)possess better high-temperature thermal radiation shielding performance than ***,the high-temperature thermal radiation shielding performance of ME(Ta,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)is superior to that of ME(Y,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)due to its narrower band gap and correspondingly higher infrared absorbance(above 0.7)at the waveband of 1 to 5μ*** two ME oxides also display significantly lower thermal conductivity than YSZ and close thermal expansion coefficients(TECs)to YSZ and Ni-based *** addition,the two ME oxides possess excellent CMAS *** attack by molten CMAS at 1250℃for 4 h,merely~2μm thick penetration

关键词： Medium-entropy ceramics Thermal barrier coatings Thermal radiation shielding CMAS resistance Infrared absorbance

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Calcaulation of electric field and spark of punch surface for pulsed electric current sintering

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6th Pacific Rim Conference on Ceramics and Glass technology, PacRim6

作者： Zhang, D.M. Zhang, L.M. Wang, Z.Z. State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Electric Power North China Electric Power University Beijing 102206 China

ISBN: (纸本)0470081562

Spark or not in insulator materials sintered by pulse electric current or spark plasma sintering is still in dispute. In this paper, the electric field in the graphite die was calculated by Maxwell theory. The calculated results indicate that the distribution of electric field is in heterogeneous. The intensity of electric field is enhanced at the centre area contacting with punch surface, weakened in circumference contacting with the die. It is deduced from the calculated results that the most possible area to generate spark lies on the punch surface if any spark could be generated in the sintered sample. Some experimental results are accordance with the calculated distribution of electric field and the spark of punch surface.

关键词： Electric currents

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Mechanical alloying and spark plasma sintering of CoCrFeNiMnAl high-entropy alloy

Mechanical alloying and spark plasma sintering of CoCrFeNiMn...

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作者： Wang, Chao Ji, Wei Fu, Zhengyi Department of Architecture and Material Engineering Hubei University of Education Wuhan430205 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

An equiatomic CoCrFeNiMnAl high-entropy alloy was synthesized by mechanical alloying, and alloying behaviors, microstructure and annealing behaviors were investigated. It was found that a solid solution with refined microstructure of 20 nm in grain size could be obtained after 30 h milling. As-milled powder transformed into a face-centered cubic phase above 500 °C. The as-milled powder was subsequently consolidated by spark plasma sintering at 800 °C, BCC phase and FCC phase coexisted in the consolidated HEA, which had excellent properties in Vickers hardness of 662 HV and compressive strength of 2142 MPa. © 2014 The Society of Powder technology Japan. Published by Elsevier B.V. and The Society of Powder technology Japan. All rights reserved.

关键词： Mechanical alloying

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RETRACTED ARTICLE: Effects of high-pressure high-temperature sintering on the thermoelectric properties of Pb0.55Te0.45

RETRACTED ARTICLE: Effects of high-pressure high-temperature...

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作者： Chen, Bo Sun, Zhen-Ya Li, Ming-Fa Wang, Shan-Yu Fan, Duan Institute of High Temperature and High Pressure Physics Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

ISBN: (纸本)9781457705366

The n-type nonstoichiometric Pb0.55Te0.45materials were prepared by melting and quenching combined with a subsequent high pressure high temperature (HPHT) treatment. After adequately annealed at 623 K in the argon atmosphere, the thermoelectric transport properties of the prepared samples have been systematically investigated. The results show that the pressure effectively adjusts the carrier concentration and its transport properties, and hence commendably tunes thermoelectric performances of the samples. Therefore, the maximum ZT of the sample treated by 2 GPa reaches 0.84 at 580 K, which is ∼ 400% improvement in comparison with the melting ingot. © 2011 IEEE.

关键词： High pressure effects

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