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Optimization of p-type Segmented Bi_2Te_3/CoSb_3 Thermoelectric Material Prepared by Spark Plasma Sintering

Journal of Wuhan University of technology(materials Science) 2006年第4期21卷 126-129页

作者：王军 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

A kind of p-type segmented Bi2 Te3/CoSB3 thermoetectric material was preparea oy sparse ptasma sintering（ SPS ） . When the segmented materials were used at the temperature ranging from 300 K to 800 K, the junction temperature was optimized, which is about 500 K, and the corresponding length ratio of CoSb3 to Bi2 Te3 is about 15 ： 2. The measured maximum power output of segmented materials is abont 320 W·m^-2, which is about 1.8 times as high as that of monolithic material CoSb3 under the same measuring conditions.

关键词： CoSb3 compounds bismuth telluride segmented thermoelectric materials power outpats

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Porous Alumina Ceramics Fabricated by Spark Plasma Sintering

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Chinese Journal of Aeronautics 2006年第B12期19卷 257-260页

作者： WANG Kun FU Zheng-yi PENG Yong WANG Yu-cheng ZHANG Jin-yong ZHANG Qing-jie State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Porous alumina of regular spherical particles was fabricated with the spark plasma sintering （SPS） and then compared to those obtained through conventional hot pressing （HP）. The effects of the parameters of the heating process on porosity were also investigated, Microstructural studies suggest that porous ingots including regular pores be made out of regular spherical alumina particles due to the close sphere packages. A comparative study on the relative necks of the specimens produced by SPS and HP indicates an enhancement of neck growth with SPS. Contrasting the theoretical values to the experimental results over the relative necks indicates that a proper relationship between the relative necks and the porosity can be established by a sintering model.

关键词： spark plasma sintering （SPS） porous alumina ceramics sintering neck

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Electrorheological Properties of Suspensions of PAn-PEO-PAn Triblock Copolymer Particles

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Journal of Wuhan University of technology(materials Science) 2005年第4期20卷 43-45页

作者：马会茹 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The PAn-PEO-PAn triblock copolymer with the PEG chain length of 400 was synthesized by chemical oxidation copolymerization of aniline and α,ω-bis（p-aminophenyl）poly（ethylene glycol）and characterized by FT-IR and *** experimental results show that the copolymer particles are of μtypical core-shell structure after the self-assembly process in *** conductivity is much lower than that of the pure *** suspension containing 20 vol% PAn-PEO-PAn tiblock copolymer in silicone oil exhibits.a typical electrorheological （ER） effect in DC electric *** it shows a lower leakage current density than that of the pure PAn-based ER ***,the PEO shell hinders the electric hop among PANI chains and decreases the current density of ER fluids in an external electric *** the same time the interface polarity improves the ER effects.

关键词： PAn-PEO-PAn triblock copolymer core-shell particles ER properties

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Microwave Permeability Change of FeCo Nanocrystalline During High Energy Ball Milling

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Journal of Wuhan University of technology(materials Science) 2006年第1期21卷 16-18页

作者：王维官建国 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070China

The microwave magnetic properties of the ball milled FeCo panicles were investigated as functions of ball milling time （ t ） using microwave electromagnetic parameters analysis techniques. The results show that the imaginary part of intrinsic dynamic permeability （ ui ） of the ball- milled panicles is much bigger than that of raw powders. ui strongly depends on t and exhibits several slightly damped ferromagnetic resonances. These phenomena are in qualitative agreement with the formation of the corresponding microstructure or the Aharoni ＇ s model of non-uniform exchange resonance modes. The present microwave permeabilhy behavior indicates that nanocrystalline materials with the same grain size may exhibit different properties that depend upon the microstructure, which provides a possibility for manufacturing high performance microwave absorber.

关键词： high energy ball milling carbonyl iron cobalt alloy nanocrystalline microwave electromagnetic parameters

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Preparation of TiAl/Ti_2AlC Composites with Ti/Al/C Powders by In-situ Hot Pressing

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Journal of Wuhan University of technology(materials Science) 2006年第2期21卷 14-16页

作者：梅炳初严明 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

TiAl/Ti2AlC composites were prepared by in-situ hot pressing of TilAl/C powders mixtures and sintered at different temperatures were investigated by X- ray diffraction （ XRD ） of samples. The reaction procedure of Ti-Al-C system could be divided into three stnges. Below 900℃ , Ti reacts with Al to form TiAl intermetallics ; above 900 ℃ , C reacts with remain Ti to form TiC triggered by the exothermal reaction of Ti and Al ; TiAl reacts with TiC to produce dense TiAl/Ti2AlC *** the holding stage, ternary Ti2AlC develops to layered polycrystal and composites pyknosis in the meanwhile. The mechanism of synthesis and microstructure was especially discussed.

关键词： Ti-Al-C system TiAl/Ti2AlC composites in-situ hot pressing microstructure

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Liquid Phase Sintering (LPS) and Dielectric Constant of α-Silicon Nitride Ceramic

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Journal of Wuhan University of technology(materials Science) 2006年第2期21卷 98-100页

作者：陈常连 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The spark plasma sintering （SPS） was applied to prepare α-Si3 N4 ceramics of different densities with magnesia, silicon dioxide, alumina as the sintering aids. The mechanism of liquid phase sintering （LPS） wus discussed and the factors influencing the density of the prepared samples were analyzed. The dielectric constant of sintered samples was tested. The experimental results show that the density can be controlled from 2.48 g/ cm^3 to 3.09 g/ cm^3 while the content of the sintering aids and the sintering temperature alter and the dielectric constant is closely dependent on the density of obtained samples.

关键词： liquid phase sintering （LPS） spark plasma sintering （SPS） α-silicon nitride sintering aids dielectric constant

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Numerical Simulation of the Temperature Field in Sintering of TiB_2-BN by SPS

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Journal of Wuhan University of technology(materials Science) 2006年第3期21卷 126-128页

作者：王玉成 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070 China

The temperature field during the whole process of SPS sintering TiB2 -BN sample was numerically simulated based on the simplification of the temperature rising process. The result shows that the highest temperature is found in the punch and the heat flows from punch to sample and die in SPS sintering system. In the radial direction, the center temperature of the sample is much higher than the circumference temperature of the sampie. In the axial direction, the center temperature of the sample is lower than the border temperature of the sampie. The temperature difference in the sample is growing bigger in the sintering process and reaches the maximum at the end of the heating-up process.

关键词： numerical simulation temperature field SPS TiB2 -BN

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Three dimensional porous frameworks for lithium dendrite suppression

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Journal of Energy Chemistry 2020年第5期29卷 73-89页

作者： Shuyan Ni Shuangshuang Tan Qinyou An Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina

Lithium metal is a promising anode material owing to its very low electrochemical potential and ultrahigh specific ***,the growth of lithium dendrites could result in a short lifespan,low coulombic efficiency,and potential safety hazards during the progress of lithium plating/*** factors drastically hinder its application in lithium metal *** review focuses on the use of three dimensional(3D)porous host frameworks to improve Li plating/stripping behaviors,accommodate the change in volume,and suppress or block lithium dendrite *** 3D porous frameworks,including the conductive carbon-based,metal-based,and lithiophilic inorganic-compound frameworks are introduced and summarized in *** particular functions,relative developments,and optimized strategies of various 3D porous frameworks for lithium deposition/dissolution behaviors are ***,the challenges and promising developments in the field of Li metal anodes will be discussed at the end of this review.

关键词： Lithium metal battery 3D porous frameworks Lithium dendrite Lithium sulfur batteries Lithium oxygen batteries Li plating/stripping

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Rapid growth of ZnO hexagonal prism crystals by direct microwave heating

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Rare Metals 2008年第5期27卷 517-521页

作者： ZHU Zhenqi ZHOU Jian LIU Guizhen REN Zhiguo State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

ZnO hexagonal prism crystals were synthesized from ZnO powders by microwave heating in a short time （within 20 min） without any metal catalyst or transport agent. Zinc oxide raw materials were made by evaporating from the high-temperature zone in an enclosure atmosphere and crystals were grown on the self-source substrate. The inherent asymmetry in microwave heating provides the temperature gradient for crystal growth. Substrate and temperature distribution in the oven show significant effects on the growth of the ZnO crystal. The morphologies demonstrate that these samples are pure hexagonal prism crystals with maximum 80 lain in diameter and 600 lure in length, which possess a well faceted end and side surface. X-ray diffraction （XRD） reveals that these samples are pure crystals. The photoluminescence （PL） exhibits strong ultraviolet emission at room temperature, indicating potential applications for short-wave light-emitting photonic devices.

关键词： zinc oxide prism crystal microwave heating vapor growth

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Complementary enhancement between noble metal-like Fe 3 C and Cu 0 /Cu + sites to fulfil highly selective wide-potential nitrate electroreduction to ammonia

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Journal of Energy Chemistry 2025年 108卷 713-723页

作者： Yuxuan Zhou Runlin Xia Ran Hao Shengjing Li Xinyu Chen Yuping Liu Wei Li State Key Laboratory of Element-Organic Chemistry Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) College of Chemistry Nankai University Tianjin 300071 China Institute of Chemical Industry of Forest Products Chinese Academy of Forestry National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass Key Lab. of Chemical Engineering of Forest Products National Forestry and Grassland Administration Nanjing 210042 Jiangsu China

Mild electrocatalytic nitrate reduction reaction (NO3RR), driven by renewable electricity, is regarded as a desirable strategy for green ammonia synthesis and simultaneous removal of nitrogen-containing environmental pollutants. In view of different supply voltages from renewable energy sources, developing cost-effective and efficient electrocatalysts with a wide operating potential window is very meaningful for practical application. However, currently reported catalysts usually need to introduce noble metals to synergistically achieve wide-potential selective ammonia synthesis from nitrate. In this work, we present for the first time a dual-transition-metal electrocatalyst (Fe 3 C-CuO x @NC, x = 0, 1) with wide-potential-adaptability for highly selective nitrate reduction to ammonia. Such Fe 3 C-CuO x @NC with spatially separated CuO x and noble-metal-like Fe 3 C nanoparticles encapsulated with nitrogen-doped graphitized carbon, exhibits outstanding performance in NO3RR with desirable NH 3 Faraday efficiency of more than 90% over a wide potential ranging from −0.2 V vs. RHE to −0.6 V vs. RHE, comparable to the reported noble metal catalysts. Different from common tandem catalysis, the wide-potential high ammonia selectivity of Fe 3 C-CuO x @NC is dominantly ascribed to the complementary enhancement between CuO x and Fe 3 C, fully supported by results of experiments and density function theory calculations. CuO x exhibit highly intrinsic nitrate reduction to nitrite to compensate for the slow potential determination step (*NO 3 → *NO 3 H) of Fe 3 C, while Fe 3 C, besides behaving like noble metals to supply adequate active hydrogens, has both good adsorption and reduction abilities for nitrite species to ammonia. Moreover, Fe 3 C partially stabilizes active Cu 0 /Cu + sites, and the unique carbon-layer encapsulation structure effectively prevents the agglomeration and corrosion of metal nanoparticles during the electrocatalysis, thus maintaining good cyclic stabi

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