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Corrosion Behavior of SnO2-based Electrode Ceramics in Soda-lime Glass Liquid

IOP Conference Series: materials Science and Engineering 2011年第20期18卷

作者： Guoqiang Luo Qiang Shen Qizhong Li Dongming Zhang Chuanbin Wang Lianmeng Zhang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Dense SnO2-based electrode ceramics have extensive application prospect in glass electric-melting industry due to the excellent electrically-conductive and chemical property in high temperatures and oxidation environment. In this paper, dense SnO2-based electrode ceramics doped with MnO2 and Sb2O3 were prepared by pressureless sintering method and the corrosion rate in soda-lime glass liquid as well as the microstructure evolution was mainly investigated. The results suggested that SnO2-based ceramics had good corrosion resistance, and the minimum value was only 2.54×10−4 mm/h when MnO2 content is 1.0% and Sb2O3 content is 0.1%. Composition Elements of Glass liquid were detected in the grain boundary and some intergranular pores. It was found that SnO2 grains remained unchanged, whereas MnO2 was easily dissolved into molten glass liquid. SnO2-based electrode ceramics with dense structure and few amounts of additives had excellent corrosion resistance to the molten glass.

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In-Flight Formation of Nano-Crystalline Titanium Dioxide Powder in a Plasma Jet and Its Characterization

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Plasma Science and technology 2010年第4期12卷 426-432页

作者： P. V. ANANTHAPADMANABHAN M. VIJAY T. K. THIYAGARAJAN K. P. SREEKUMAR V. SELVARAJAN Jiaguo YU Shengwei LIU Laser & Plasma Technology Division Bhabha Atomic Research Centre Mumbai-400085 India Department of Physics Bharathiar University Coimbatore 641046 India State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Nanocrystalline titanium dioxide powder was synthesized by in-flight oxidation of titanium dihydride （TiH2） powder in a thermal plasma jet. TiH2 powder was injected into the thermal plasma jet and allowed to react with oxygen injected downstream the jet. Characteriza- tion of the powder by various analytical tools indicated that the powder consisted of nano-sized titanium dioxide particles consisting predominantly of the anatase phase. It is suggested that the thermo-chemistry of the oxidation process contributes significantly to the formation of nano-sized titania. The large energy released during the oxidation process dissociates the TiO2 particles into TiO（g） and titanium vapour, which recombine downstream with oxygen and form nano particles of TiO2.

关键词： nanostructures titanium dioxide arc plasma synthesis reactive plasma pro- cessing surface properties

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Effect of stacking layers on the structure and properties of Ca(Mg 1/3Nb2/3)O3/ CaTiO3 thin films

Effect of stacking layers on the structure and properties of...

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6th Asian Meeting on Electroceramics, AMEC-6, in conjunction with the Electronics Division Meeting of the Ceramic Society of Japan

作者： Zhou, Jing Zhu, Jie Chen, Wen Shen, Jie Lei, Qiong He, Huimin State Key Lab. of Advanced Technology for Materials Synthesis and Processing Institute of Materials Science and Engineering Wuhan University of Technology China

ISBN: (纸本)0878493069

Effect of stacking layers on the structure and properties of Ca(Mg 1/3Nb2/3)O3/CaTiO3 (CMN/CT) microwave dielectric heterogeneous thin films prepared was investigated. Precursor solutions for CMN and CT synthesis were obtained by Pechini method. The arrangement pattern has affected structure and properties of heterogeneous thin film. The CMN-CT arrangement heterostructure thin film has second phase from the CMN films layer. The CT-CMN heterostructure film which has a smooth and dense microstructure was composed of pure perovskite phase without any second phase, this result was attributed to the CT film layer which is a buffer layer between substrate and CMN film layer. At 1MHz frequency, CT-CMN exhibits the dielectric properties of Εr=47.5, tanδ=0.020. © (2010) Trans Tech Publications.

关键词： Thin films

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Microstructure and dielectric properties of (Sr_(0.88)Bi_(0.08)) TiO_(3)-Bi(Mg_(1/2)Ti_(1/2))O_(3) ceramics

Microstructure and dielectric properties of (Sr_(0.88)Bi_(0....

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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： Hua Hao Bo Xiong Hanxing Liu Minghe Cao Zhiyong Yu School of Material Science and Engineering Wuhan University of Technology Wuhan P.R.China 430070 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan P.R.China 430070

ISBN: (纸本)9781457711626

In the present study, (1-x)(Sr_(0.88)Bi_(0.08))TiO_(3)-xBi(Mg_(0.5)Ti_(0.5))O_(3) (SBT-BMT) system was synthesized using conventional solid state processing. X-ray diffraction (XRD) and SEM testings were employed to determine the phase constitution and microstructure of ceramics. SBT-BMT ceramics exhibited moderate dielectric permittivities ((epsilon)_(r)) (>1100 at RT) and low dielectric loss (0.07percent) over the temperature range from -20 to 200 deg C, with flat temperature coefficients of permittivity. In addition, SBT-BMT ceramics were observed to possess dielectric relaxation characteristics and energy densities, being on the order of 1.4 J/cm~(3) at 180 kV/cm was observed for the 0.8S_(0.88)B_(0.08)T-0.2BMT ceramics.

关键词： SBT-BMT dielectric properties capacitor

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Fabrication of translucent boron nitride dispersed polycrystalline silicon nitride ceramics

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IOP Conference Series: materials Science and Engineering 2011年第1期20卷

作者： B Joshi Z Fu K Niihara S W Lee Department of Metallurgy and Material Engineering Sunmoon University Korea 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

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.

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Optical, mechanical and tribological properties of Y2O3, Er2O3 and Nd2O3 doped polycrystalline silicon nitride ceramics

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IOP Conference Series: materials Science and Engineering 2011年第8期18卷

作者： Bhupendra Joshi Zhengyi Fu Koichi Niihara Soo W Lee Department of Metallurgy and Material Engineering Sunmoon University Korea 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

Y2O3, Er2O3 and Nd2O3 doped polycrystalline silicon nitride ceramics were prepared by hot press sintering method at 1850°C and 30 MPa pressure. 1 wt.% of each rare earth oxides (REO) were sintered with 3 wt.% MgO, 9 wt.% AlN and 87 wt.% α-*** optical, mechanical and tribological properties of REO doped polycrystalline silicon nitride ceramics were investigated. Optical transmittance was measured in visible and near infrared region and found to be 54% transmittance for Y2O3 doped Si3N4 ceramics. β- phase transformation was suppressed with REO addition. High hardness and high fracture toughness were achieved by addition of REO. Adding REO shows good mechanical properties as high strength and toughness. Coefficient of friction of the REO doped silicon nitride ceramics was lower than that of without REO doped silicon nitride ceramics.

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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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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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synthesis of single-crystalline silicon nitride (α-Si 3N4) nanowires with controlled diameters by nitriding cryomilled nanocrystalline silicon powder

Synthesis of single-crystalline silicon nitride (α-Si 3N4) ...

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作者： Chen, Fei Wang, Zhihao Shen, Qiang Huang, Zhixiong Zhang, Lianmeng Key Laboratory of Advanced Technology for Specially Functional Materials Ministry of Education Wuhan University of Technology Wuhan 430070 China State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

ISBN: (纸本)9781605112565

In the present work, silicon nitride nanowires (SNNWs) have been synthesized via nitriding cryomilled nanocrystalline silicon powder. The silicon powder exhibits a fine polycrystalline structure after the cryomilling process, with an average grain size of 25 to 125 nm at various cryomilling times. The SNNWs that form after the nitridation of the cryomilled silicon powder exhibit single crystal structure and are 20 to 100 nm in diameter and ∼10 μm in length. The diameter of the nanowires is in agreement with the grain size of the cryomilled Si powder. Microstructural characterization reveals that the as-synthesized nanowires have a hexagonal structure and their primary growth direction is along the [0001] direction. The formation of the Si-N-Si bond during the cryomilling process, as investigated theoretically with density functional theory, promotes the subsequent synthesis of the α-Si 3N4 nanowires. The mechanism for nanowire formation appears to be a vapor-solid (VS) reaction. © 2010 materials Research Society.

关键词： Nanocrystals

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The dielectric properties and structure of Ni-doped (0.8-x) PMT-0.2PZ-xPT ternary system near morphotropic phase boundary

The dielectric properties and structure of Ni-doped (0.8-x) ...

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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： Hao, Hua Liu, Hanxing Cao, Minghe Yu, Zhiyong Shixi, Ouyang School of Material Science and Engineering Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Morphotropic phase boundary (MPB) of (0.8-x)PMT-xPbTiO3(PT)-0. 2PbZrO3(PZ) ternary system (x = 0.4) was studied by X-ray diffraction (XRD). It shows that by comparing with 0.4PMT-0.2PZ-0.4PT sample, after doping with Ni, c/a remains almost same (about1.009), while both c and a decrease indicating that lattice shrinks. Content of the tetragonal phase TP% of Ni-doped samples increase up to 81.1% when the doping limit of the nickel is reached (y = 0.05), and the dielectric constant Ε was found to increase up to 4570 when y = 0.05 and the Curie temperatures of doping samples were found to decrease from 175°C to 157°C.

关键词： Ternary systems

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