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International Symposium on Multifunctional Ceramic materials Based on Nanotechnology, ISMCN 2010

作者： Joshi, B. Fu, Z. Niihara, K. Lee, S.W. Department of Metallurgy and Material Engineering Sunmoon University Korea Republic of State Key Lab. of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology China Nagaoka University of Technology Nagaoka Japan Department of Environment Engineering Sunmoon University Asan Korea Republic of

Optical transparency was achieved at infrared region and overall translucent silicon nitride was fabricated using hot press sintering (HPS). The increase in h-BN content decreased the optical transparency. Microstructral observations shows that the optical, mechanical and tribological properties of BN dispersed polycrystalline Si3N4 ceramics were affected by the density, α:β-phase ratio and content of h-BN in sintered ceramics. The hot pressed samples were prepared from the mixture of α-Si3N4, AlN, MgO and h-BN at 1850°C. The composite contained from 0.25 to 2 mass % BN powder with sintering aids (9% AlN + 3% MgO). Maximum transmittance of 57% was achieved for 0.25 mass % BN doped Si3N4 ceramics. Fracture toughness was increased and wear volume and friction coefficient were decreased with increase in BN content.

关键词： III-V semiconductors

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Effect of pre-forming condition on flow behaviour of 4032 aluminium alloy

Effect of pre-forming condition on flow behaviour of 4032 al...

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10th International Conference on technology of Plasticity, ICTP 2011

作者： Deng, L. Wang, X.Y. Jin, J.S. Xia, J.C. Li, J.J. State Key Lab. of Material Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783514007840

The effects of pre-forming conditions, such as temperature and strain, on flow behaviour and material constant of constitutive equation were presented to achieve a quantitative relationship between pre-forming condition and material constant of hyperbolic sine type constitutive model. Isothermal extrusion process of 4032 aluminium alloy was carried out with different temperatures and strains. T6 temper process was carried out for extrusion aluminium bars before compression at elevated temperature. Isothermal compression experiment was carried out with Zwick/Roell Z020 universal testing machine. While the compression parameters are the same, the peak stresses of specimens preformed with different conditions decrease with the increase of extrusion temperature, and increase with the increase of strain below strain 1.2. The hyperbolic sine type constitutive models were obtained, and the material constants, such as activation energy and stress exponent, were identified by regression analysis based on results of compression experiment. The quantitative relationship between activation energy, stress exponent and pre-forming conditions was obtained by polynomial fitting. These equations would be applied in numerical solution procedure for discontinuous multistage metal forming. © 2011 IBF (RWTH Aachen) & IUL (TU Dortmund).

关键词： Strain

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Preparation and properties of spark plasma sintered AlN/BN nano-composites

Preparation and properties of spark plasma sintered AlN/BN n...

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作者： Li, M.J. Zhang, L.M. Wei, Z.D. Shen, Q. Zhang, D.M. State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Science Wuhan University of Technology Wuhan 430070 China

Nano-sized turbostritic-BN (t-BN) was fabricated through chemical process using boric acid and urea in this work. By the same method, the AlN powders coated with nano-BN were prepared too. The results of X-ray diffraction (XRD) and transmission electron microscope (TEM) revealed that nano-sized t-BN was synthesized at about 600°C in nitrogen gas and it surrounded the surface of AlN particles. High-density AlN/BN nano-composites were fabricated spark plasma sintering (SPS). Microstructure and properties of AlN/BN nano-composites (5∼30vol% BN) were investigated. The h-BN flake particles were homogenously dispersed at AlN grain boundaries and within grains in the AlN/BN composites. A little nano-BN additions significantly improved the bending strength of the nano-composites. However, the bending strength was decreased with the BN content increasing. The thermal conductivity of AlN/BN nano-composites was investigated too.

关键词： Nanocomposites

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An indoor positioning algorithm based on path tracking assistance

An indoor positioning algorithm based on path tracking assis...

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International Conference on Computational Intelligence and Software Engineering

作者： Zhao, Yongxiang Li, Meifang Wuhan University of Technology State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan 430070 China Wuhan University of Technology School of Management Wuhan 430070 China

ISBN: (纸本)9781424453924

In real life, people always move according to a certain paths, for example, walking from one side of corridor to the other side of it, but not passing through the wall, and so on. Therefore, all kinds of possible paths could be predefined, then the indoor positioning systems can make full use of these paths to further improve the positioning accuracy. In this paper, an indoor positioning algorithm based on path tracking assistance is presented which makes the most of path information in indoor environment to optimize the searched subspaces of positioning algorithm. Experimental results demonstrated that the proposed path tracking assistance algorithm can improve the 73% accuracy in 3 meters of traditional kNN algorithm to 92% in a typical office building testbed when the subspaces are defined rationally. ©2010 IEEE.

关键词： Indoor positioning systems

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Densification and thermal conductivity of y2O3-doped AIN ceramics by spark plasma sintering

Densification and thermal conductivity of y2O3-doped AIN cer...

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作者： Shen, Q. Wei, Z.D. Li, M.J. Zhang, L.M. State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Science Wuhan University of Technology Wuhan 430070 China

AlN ceramics doped with yttrium o5xide (Y2O3) as the sintering additive were prepared via the spark plasma sintering (SPS) technique. The sintering behaviors and densification mechanism were mainly investigated. The results showed that Y2O3 addition could promote the AlN densification. Y2O3-doped AlN samples could be densified at low temperatures of 1600-1700°C in 20-25 minutes. The AlN samples were characterized with homogeneous microstructure. The Y-Al-O compounds were created on the grain boundaries due to the reactions between Y 2O3 and Al2O3 on AlN particle surface. With increasing the sintering temperature, AlN grains grew up, and the location of grain boundaries as well as the phase compositions changed. The Y/Al ratio in the aluminates increased, from Y3Al5O 12 to Y4lO3 and to Y4Al 2O9. High-density, the growth of AlN grains and the homogenous dispersion of boundary phase were helpful to improve the thermal conductivity of AlN ceramics. The thermal conductivity of 122Wm -1K-1 for the 4.0 mass%Y203-doped AlN sample was reached.

关键词： Yttrium compounds

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Study on impact factor of sci-tech journal in china using genetic programming

Study on impact factor of sci-tech journal in china using ge...

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International Conference on Computational Intelligence and Software Engineering

ISBN: (纸本)9781424453924

In this paper, we establish nonlinear GP model between impact factor of sci-tech journal and related indexes based on genetic programming approach. The proposed GP model utilizes average authors, number of district, number of affiliation, international paper ratio and foundation paper ratio as the inputs, and uses impact factor as the output. The journals data from Chinese S&T Journal Citation Reports in 2005 are used as experimental data. The experimental results show that impact factor is mainly related to average authors and foundation paper ratio, and nearly has nothing to do with number of district, number of affiliation and international paper ratio. Therefore, increasing the average authors and foundation paper ratio of sci-tech journal will help to promote the impact factor of journal and improve the quality of journal to some extent. ©2010 IEEE.

关键词： Genetic programming

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Single-Atom Lithiophilic Sites Confined within Ordered Porous Carbon for Ultrastable Lithium Metal Anodes

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Energy & Environmental materials 2023年第3期6卷 366-372页

作者： Wenzhong Huang Shanlin Liu Ruohan Yu Liang Zhou Zhenhui Liu Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Nanostructure Research Centre Wuhan University of TechnologyWuhan 430070China College of Material Science and Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu hydrogen ValleyFoshan 528200China

Attributing to the high specific capacity and low electrochemical reduction potential,lithium(Li)metal is regarded as the most promising anode for high-energy Li ***,the growth of lithium dendrites and huge volume change seriously limit the development of lithium metal *** overcome these challenges,an ordered mesoporous N-doped carbon with lithiophilic single atoms is proposed to induce uniform nucleation and deposition of Li *** from the synergistic effects of interconnected three-dimensional ordered mesoporous structures and abundant lithiophilic single-atom sites,regulated local current density and rapid mass transfer can be achieved,leading to the uniform Li deposition with inhibition of dendrites and buffered volume *** a result,the as-fabricated anode exhibits a high CE of 99.8%for 200 cycles.A stable voltage hysteresis of 14 mV at 5 mA cm^(−2)could be maintained for more than 1330 h in the symmetric ***,the full cell coupled with commercial LiFePO_(4)exhibits high reversible capacity of 108 mAh g^(−1)and average Coulombic efficiency of 99.8%from 5th to 350th cycles at 1 *** ordered mesoporous carbon host with abundant lithiophilic single-atom sites delivers new inspirations into rational design of high-performance Li metal anodes.

关键词： lithiophilic lithium metal battery ordered mesoporous carbon single atom

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Fast Welding of Chromium Carbide and Nickel Alloy by Spark Plasma Sintering

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Journal of Wuhan University of technology(materials Science) 2016年第4期31卷 835-837页

作者：刘国玺 LI Kezhi LENG Xiaoxuan 张金咏 ZHANG Fan School of Materials Science Northwestern Polytechinical University Xi'an 710072 China Ningbo Branch of Ordnance Science Institute of China Yantai 264003 China China State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Spark plasma sintering（SPS） was used to weld the ceramics,eg,Cr3C2 and metal,Ni in this *** is found that the SPS can weld the Cr3C2 and Ni plates at lower temperatures and shorter holding time comparing with that of hot-pressing（HP）.The binding strength was 113 MPa when the temperature was 1000 ℃ by SPS,compared with 10 MPa by HP at the same *** remarkably enhances the atom diffusion in *** analysis at different welding temperatures and holding times of SPS or HP shows that the local temperature gradient,different from the past effects of by-passing current,is the dominative mechanism of the SPS welding.

关键词： Sintering welding Welding holding ceramics sintering welded pressing remarkably heating

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Carbothermal reduction and nitridation synthesis of γ-AlON powder under high heating rate

Carbothermal reduction and nitridation synthesis of γ-AlON ...

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1st International Symposium on advanced synthesis and processing technology for materials, ASPT08

作者： Peng, Ding Wang, Hao Wang, Weimin Wang, Yucheng Fu, Zhengyi State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China

ISBN: (纸本)0878493298

In this paper, a carbothermal reduction and nitridation (CRN) synthesis for cubic aluminum oxynitride (γ-AlON) powders is reported. The CRN reaction was conducted via a two-step synthesis procedure at a heating rate of 100 °C/min. In the first step, the mixture of fine γ-Al2O3and soluble starch was annealed at 1550˜1580 °C for different duration. It is found that the mixture of α-Al2O3and AlN with an appropriate ratio can be obtained by CRN reaction. The content of AlN in mixture is closely related with the reaction condition. In the second step, the as-received mixture of α-Al2O3and AlN was heat-treated at 1700 °C for 10 min. The single phase γ-AlON powders with particle size less than 3 μm were obtained. © (2009) Trans Tech Publications, Switzerland.

关键词： Powders

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The EVA plastic film for V-process and steel castings by V-process in China

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China Foundry 2008年第2期5卷 77-81页

作者： Ye Shengping Wang Lei Liu Dehan State Key Lab. of Material Processing and Die ＆ Mould Technology Huazhong University of Science and Technology Wuhan 430074 China Wuhan Hengde Technology Co. Ltd. Wuhan China

EVA plastic film is the key material for V-process. Through decades of research, special EVA film for V-process has been produced. The film has adequate elongation; its maximum is about 800% in longitudinal direction and 750% in transversal direction. The single width of the film is 2.8 m and the double width is 5.6 m, which is the widest sheet film for V-process in China. Sheets with different thickness ranging from the thickest 0.35 mm to the thinnest 0.08 mm can meet different demands in China. The film can be used not only for V-process of iron castings, but also for the manganese steel railway frog, steel rocking support and side frame castings for train and the steel bridge box for engine truck.

关键词： V - Process EVA plastic film steel castings

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