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International Conference on Electric Information and Control Engineering

作者： Tianqi Yang Jinsheng Xiao Wenyu Zhao Qingjie Zhang School of Automotive Engineering Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

ISBN: (纸本)9781424480364

A 3-D finite element model of two-stage thermoelectric generator based on low-temperature thermoelectric material bismuth-telluride and medium-temperature thermoelectric material skutterudites is established. Based on the formal model, structural optimization of the two-stage thermoelectric generator is carried out. Results show that, reasonable design of the structure of two-stage thermoelectric generator can take full advantage of the characteristics of thermoelectric materials and effectively improve the performance of power generation. If contact resistance and all heat losses are neglected, the conversion efficiency of the two-stage thermoelectric generator can reach a value of 17.02%.

关键词： Design optimization Thermoelectric generator Thermoelectric unicouple Conversion efficiency Finite element

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Numerical Simulation and Experimental Research on Penetration of Composite Ceramic Armor by Rod Projectile

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Journal of Wuhan University of technology(materials Science) 2010年第6期25卷 1006-1010页

作者：付克勤张金咏 The Ningbo Branch of Ordnance Science Institute of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

The performance of composite ceramic armor penetrated by rod projectile was studied by both numerical simulation and *** penetration and damage mechanisms of the projectile-armor after high-speed collision were also observed by high-speed *** experimental results showed that the ballistic performance of composite ceramic armor was highly affected by the density,hardness and toughness of bulletproof *** flow stress of the failed bulletproof ceramic is not only related to the pressure but also related to the strain *** phenomenological method based on Bodner-Partom ceramic model was introduced to derive the growth rate of *** simulation results show good agreement with the experimental results.

关键词： composite ceramic armor rod projectile numerical simulation experiment damage

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Effects of Activated Sintering Process on Properties and Microstructure of W-15Cu Alloy

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Journal of Wuhan University of technology(materials Science) 2010年第6期25卷 909-913页

作者：史晓亮 School of Mechanical and Electronic Engineering Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis & Processing Wuhan University of Technology

The effects of activated sintering technology of H2 atmosphere sintering on the microstructure and properties of W-15Cu alloy using ultrafine W-15Cu composite powder fabricated by spray drying calcining-continuous reduction technology were *** experimental results showed that W-15Cu alloy,consolidated by activated sintering technology of H2 atmosphere sintering for 1 h at 1300 ℃,with 98.5 % relative density,transverse rupture strength 1218 MPa,Vickers hardness HV0.5 378,average grain size about 1.2 μm and thermal conductivity 192 W/m·K,was *** comparison to the normal sintering process,activated sintering process to W-15Cu alloy could be achieved at lower sintering ***,better properties in activated sintered compacts were obtained,and activated sintering process resulted in finer microstructure and excellent properties.

关键词： ultrafine composite powder W-15Cu alloy activated sintering process microstructure properties

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Preparation of B4C-ZrB2-SiC eutectic ceramics by arc melting method

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中国高等学校学术文摘·材料科学 2010年第3期4卷 281-284页

作者： Qi-Long GUO Jun-Guo LI Ai-Yi PENG State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The B4C-ZrB2-SiC ternary composites with super hard and high toughness were obtained by arc melting in argon atmosphere. Microstructures were observed by SEM, and phase compositions were analyzed by XRD. The hardness and fracture toughness of ternary composites are 28GPa and 4.5MPa-m1/2. The eutectic mole composition is 0.39B4C-0.25ZrB2-0.36SiC, and the eutectic lamellar microstructure is composed of B4C matrix with the lamellar ZrB2 and SiC grains.

关键词： B4C-ZrB2-SiC arc melting eutectic composition

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Preparation and electromagnetic characteristics of steel slag/charcoal nano-/micro-composites

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Gongneng Cailiao/Journal of Functional materials 2011年第SUPPL. 2期42卷 287-291页

作者： Tong, Guo-Xiu Yuan, Jin-Hao Hua, Qiao Qin, Ming-Yue Cai, Jian-Jing Guan, Jian-Guo College of Chemistry and Life Sciences Zhejiang Normal University Jinhua 321004 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Using steel slag and charcoal as raw materials, the steel slag/charcoal nano-/micro-composites with magnetic-resistance mixed loss mode were fabricated by a high-performance milling process, and then the composition, phase structure, morphology, and electromagnetic (EM) characteristics of the products were characterized by XRD, EDS, SEM, and vector network analyzer, respectively. The results showed that EM characteristics of the products were strongly dependent on the content of the charcoal (WCharcoal). The real and imaginary parts of the permittivity of the steel slag/charcoal nano-/micro-composites significantly increased with the increasing WCharcoal. Among them, the steel slag/charcoal composites with WCharcoal=50wt% exhibited the best EM-wave absorption performance, with a maximum reflectivity value of -33.4dB, the effective bandwidth 15.2GHz(<-10dB) and 8.6 GHz (<-20 dB), respectively, which is a consequence of enhanced dielectric loss and a proper EM matching.

关键词： Dielectric losses

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synthesis and gas sensing properties of Fe2O3 nanoparticles activated V2O5 nanotubes

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Sensors and Actuators, B: Chemical 2010年第1期145卷 211-215页

作者： Jin, Wei Dong, Baitao Chen, Wen Zhao, Chunxia Mai, Liqiang Dai, Ying State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Luoshi Road 122 Wuhan 430070 Hubei China

The Fe2O3 nanoparticles activated V2O5 nanotubes were achieved via a hydrolysis method. The TEM and SEM images of the nanotubes indicated that the Fe2O3 nanoparticles with the particle size of about 15 nm were dispersed on the surface of the V2O5 nanotubes. The activated nanotubes exhibited excellent response and selectivity towards the ethanol gas. The lowest detection limit for ethanol gas was about 10 ppm at 230 °C, which suggested that the Fe2O3 nanoparticles activated V2O5 nanotubes would be a potential candidate for practical detector for ethanol. © 2009 Elsevier B.V. All rights reserved.

关键词： Nanoparticles

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Preparation and electrochemical properties of urchin-like α-Fe_2O_3 nanomaterials

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Science China(Technological Sciences) 2010年第7期53卷 1897-1903页

作者： TONG GuoXiu1,2, GUAN JianGuo2, WU WenHua1, LI LiangChao1, GUAN Yao2 & HUA Qiao1 1 College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China 2 state key laboratory of advanced technology for materials synthesis and processing, Wuhan University of technology, Wuhan 430070, China 1. College of Chemistry and Life Sciences Zhejiang Normal University Jinhua 321004 China2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Based on a facile glucose-guided hydrolyzing-heat-treating approach, urchin-like α-Fe2O3 nanomaterials with controllable morphology and crystallinity were prepared via adjusting the heat-treating temperature, and their electrochemical performances were investigated. The results showed that changing the heat-treating temperature can effectively control the structure and electrochemical property of the as-made products. The urchin-like α-Fe2O3 nanomaterials obtained by heat-treating at 300°C, composed of a mass of the shuttle fibrous brunches, had higher initial discharge capacity(1475 mAhg-1) than those consisting of nanorods formed at 700°C. The above difference is ascribed to the urchin-like samples obtained at the relatively low heat-treating temperature, which, with low crystallinity, large SBET, and well-regulated porous, is helpful to the adsorption of electrolyte and the transport of lithium ion, resulting in the high activity and discharge-charge capacity.

关键词： urchin-like nanomaterials hematite electrochemical performance glucose-guided hydrolyzing-heat-treating approach

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The effect of template morphologies on microstructure and properties of textured K_(0.5)Na_(0.5)NbO_(3) ceramics by RTGG method

The effect of template morphologies on microstructure and pr...

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2011 IEEE International Symposium on Applications of Ferroelectrics(ISAF/PFM 2011) and 2011 International Symposium on Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar materials

作者： Minghe Cao Fan Li Mengpu Lv Hua Hao ZhiYong Yu Zhonghua Yao Hanxing Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing WHUT Wuhan 430070 Hubei PR China School of Materials Science and Engineering WuHan University of Technology Wuhan 430070 Hubei PR China

ISBN: (纸本)9781457711626

Lead free textured K_(0.5)Na_(0.5)NbO_(3) piezoelectric ceramics have been prepared by reactive-templated grain growth method by using NaNbO_(3) with different morphologies as templates. The NaNbO_(3) template particles with different edge length (10-20 (mu)m) and thickness (0.5-2.5 (mu)m) was synthesized through controlling Bi_(1.5)Na_(x-1.5)Nb_(x)O_(3x+3) precursor's layer numbers x from 2 to 6 by two-step molten salt methods. The crystalline phases and microstructure of textured K_(0.5)Na_(0.5)NbO_(3) were characterized by X-ray diffraction and scanning electron microscopy, respectively. It shows that all the K_(0.5)Na_(0.5)NbO_(3) ceramics are orthorhombic perovskite structure with {001} orientation. By using the template particles with a ratio of edge length to thickness (l/h)(velence)approx10, the textured ceramics with optimized piezoelectric properties was prepared. The results indicate that the enhanced properties of textured ceramics are concerned with the template morphology.

关键词： K_(0.5)Na_(0.5)NbO_(3) ceramics Template morphology RTGG Textured ceramics

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Mechanical property of boron carbide ceramics prepared by Spark Plasma reactive Sintering

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作者： Zhang, S. Wang, C.B. Chen, G. Shen, Q. Zhang, L.M. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

ISBN: (纸本)9780470927151

A novel way was used to prepare dense B4C ceramics at a lower temperature by reactive sintering from carbon and boron elemental powders. Spark Plasma Sintering (SPS) technique, a rapid and non-conventional powder consolidation method, was employed. The densification, microstructure and mechanical property of the as-prepared B4C ceramics were investigated. The reactive sintering process could be divided into two stages, corresponding to synthesis (1300∼1700°C) and densification (1700∼1900°C), respectively. At those stages, boron first reacted with carbon to form B4C, and then the in-situ densification of the as-synthesized B4C occurred and was enhanced by increasing sintering temperature. B4C ceramics with grain size of several hundred nanometers and high densification (98%) were obtained at 1800°C, a lower sintering temperature as compared with general hot press. Due to the high densification and purity as well as fine texture, the SPS-sintered B4C ceramics had high Vickers hardness (48.8GPa), Young's modulus (264.5GPa), fracture toughness (3.9MPa·m1/2) and flexure strength (450MPa).

关键词： Densification

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A facile route to prepare tetragonal BaTiO3 nanoparticle through composition control

A facile route to prepare tetragonal BaTiO3 nanoparticle thr...

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12th International Meeting on Ferroelectricity, IMF-12 and the 18th IEEE International Symposium on Applications of Ferroelectrics, ISAF-18

作者： Zhao, Guanghui Cheng, Xiangbang Liu, Hanxing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

In the present work, tetragonal BaTiO3 particles down to 20 nm have been synthesized by low temperature aqueous co-precipitation method through composition control. Field emission scanning electron microscopy (FE-SEM) images indicated that the precipitates contained fine (about 20-30 nm) faceted particles. The Raman spectra revealed that tetragonal phase appeared with the increase in Ba/Ti ratio in the precursor solution. The appearance of tetragonal phase in BaTiO3 nanoparticle was related with the lattice defect revealed by lattice parameter and lattice strain calculated by XRD results. The lattice defect can be modified through composition control.

关键词： Raman scattering

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