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synthesis and photoluminescence of Eu(DBM)_3phen/APTES-SBA-15 with morphology of pearl-like chains

中国有色金属学会会刊：英文版 2006年第B01期16卷 356-360页

作者：赵春霞刘琦陈文田高徐玲芳 Institute of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan 430070China

Novel ordered mesoporous Eu(DBM)3phen/APTES-SBA-15 (EAS) composites with reasonable photoluminescence property and interesting morphology of bundles of pearl-like chains were synthesized. The characteristics of the mesostructure and the optical properties of the prepared samples were investigated by means of XRD, FTIR, SEM, TEM, N2 adsorption–desorption and PL spectroscopy. The results indicate that the as-made EAS composites have long-distance ordered mesoporous structure. Compared with the Eu(DBM)3phen complex, it is found that the EAS composites perform a considerable photoluminescence with good color purity. It is proposed that the anchored amine from the APTES and quantum size effect of the Eu(DBM)3phen complex have great effect on the photoluminescence of the EAS composites.

关键词： Eu(DBM)3phen/APTES-SBA-15 铕配合物合成光致发光珍珠链状结构形态学

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Iron Fibers Arrays Prepared by Electrodepositing in Reverse Liquid Crystalline

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Journal of Wuhan University of technology(materials Science) 2006年第2期21卷 66-68页

作者：赵素玲官建国 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 ChinaCenter for Material Research and Testing 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

Ordered iron fiber arrays were electrodeposited on the surface of zinc foils using ＂FeSO4 solution-sodium caprylate-Decanol＂ 3-component reverse hexagonal liquid crystal as soft templates. The structure of the soft templates and the synthesized iron ,fibers were characterized by polarizing microscopy, X-ray diffraction （XRD）, scanning electron microscopy （SEM） and energy dispersive X-ray microanalysis etc. The experimental results shou that the synthesized iron fibers with a crystal phase grew up in the form of fiber clusters of about 200 nm along the direction perpendicular to the cathode surface. Each cluster was composed of several tens of fibers. The fibers had almost the same length of more than 10μm with a diameter of about 50 nm.

关键词： iron fibers arrays reverse hexagonal liquid crystal soft template electrodepositing

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Diffusion bonding of Ti-6Al-4V by pulse current heating and hot-pressing

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中国有色金属学会会刊：英文版 2006年第A03期16卷 1915-1919页

作者：何代华傅正义王为民 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Pulse current heating (PCH) was used to join Ti-6Al-4V alloy at two cases of with die and without die. Hot-pressing (HP) method was used to provide a comparison between the two methods. Microstructures near the contacting surfaces were observed in optical microscope. Temperature distribution was analyzed. After joining, the tensile properties of the samples were evaluated. Experimental results show that grains and phases grow transversely on contacting surfaces, which makes two parts into a whole with a certain of tensile strength. PCH joining is a different temperature joining method. The highest temperature is located at the interface. The comparison of tensile strengths of samples joined by the two methods indicates that joining temperature and holding time needed by PCH are lower and less than those needed for HP.

关键词：压焊金属处理脉冲技术合金温度分布

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Fabrication of nano Rhizama Chuanxiong particles and determination of tetramethylpyrazine

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中国有色金属学会会刊：英文版 2006年第B01期16卷 393-397页

作者：苏艳丽傅正义全从娟王为民 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Rhizama Chuanxiong is a kind of traditional medicinal herb used to promote blood circulation and eliminate wind to relieve pain. In this work, nano Rhizoma Chuanxiong particles were successfully prepared by high speed centrifugal sheering (HSCS) pulverizer. The influence of processing parameters on the size of Rhizama Chuanxiong particles and the different properties between nano Rhizoma Chuanxiong particles and original fine powder were systematically studied by ZetaPALS light scattering granulometric analyzer and optical microscope. The content of effective ingredient tetramethylpyrazine (TMP) was determined by high-performance liquid chromatography (HPLC). The results illustrate that general Rhizama Chuanxiong powder can be ultrafinely ground to nanometer within 50 min, and the cellular tissues of Rhizoma Chuanxiong are broken into pieces and dispersed stably and homogeneously after being ultrafinely ground. In addition, the active ingredients can dissolve out directly and fully, and the extraction ratio of TMP is increased 32.2% by HSCS processing.

关键词：中草药川芎纳米颗粒加工参数四甲基吡嗪测定

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synthesis and characterization of LiNi_(0.95-x)Co_xAl_(0.05)O_2 for lithium-ion batteries

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Rare Metals 2006年第4期25卷 303-308页

作者： ZHU Xianjun ZHAN Hui LIU Hanxing ZHOU Yunhong State Key Laboratory of Advanced Technology and Processing for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China College of Chemical and Molecular Science Wuhan University Wuhan 430072 China

Samples of LiNi0.95-xCoxAl0.05O2 （x = 0.10 and 0.15） and LiNiO2, synthesized by the solid-state reaction at 725℃ for 24 h from LiOH-H2O, Ni2O3, Co2O3, and AI（OH）3 under an oxygen stream, were characterized by TG-DTA, XRD, SEM, and electrochemical tests. Simultaneous doping of cobalt and aluminum at the Ni-site in LiNiO2 was tried to improve the cathode performance for lithium-ion batteries. The results showed that co-doping （especially, 5 at.% A1 and 10 at.% Co） definitely had a large beneficial effect in increasing the capacity （186.2 mA.h/g of the first discharge capacity for LiNio.s.42OoaoAlo.0502） and cycling behavior （180.1 mA-h/g after 10 cycles for ***2） compared with 180.7 mA.h/g of the first discharge capacity and 157.7 mA.h/g of the tenth discharge capacity for LiNiO2, respectively. Differen- tial capacity versus voltage curves showed that the co-doped LiNio.95_***2 had less intensity of the phase transitions than the pristine LiNiO2.

关键词： electrochemistry LiNi0.95-xCoxAl0.05O2 lithium-ion batteries co-doping cathode materials LiNiO2

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Characterization and properties of new dielectric ceramics Ba_5LnZnNb_9O_(30)(Ln=La, Nd and Sm)

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中国有色金属学会会刊：英文版 2006年第B02期16卷 534-537页

作者：朱文凤胡长征吴伯麟方亮 Key Laboratory of Nonferrous Materials and New Processing TechnologyMinistry of Education Guilin University of TechnologyGuilin 541004China Key Laboratory of Nonferrous Materials and New Processing TechnologyMinistry of Education Guilin University of Technology Guilin 541004China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Three novel dielectric ceramics Ba5LnZnNb9O30 (Ln= La, Nd and Sm) were synthesized and characterized in the BaO-Ln2O3-ZnO-Nb2O5 quaternary system, which formed the filled tungsten-bronze structures. The present ceramics exhibit high dielectric constant (εr) up to 310, low dielectric loss in the level of 10 3 at 1 MHz. Meanwhile, the temperature coefficients of the dielectric constant (τε) of Ba5LnZnNb9O3o varies from -1 390×10-6 to -1 220×10-6/℃as the radius of Ln3+ increases. The present ceramics are promising candidates for high dielectric constant and low loss dielectric ceramics.

关键词：介电陶瓷 Ba5LnZnNb9O30 Ba5NdZnNb9O30 Ba5SmZnNb9O30 合成介电性质表征

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Research on shaping technology of nanocomposite WC-6Co powder and properties of sintered compacts

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International Journal of Nanoscience 2006年第2-3期5卷 233-238页

作者： Shi, Xiaoliang Shao, Gangqin Duan, Xinglong Yuan, Runzhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China

The influences of powder extrusfen molding (PEM), die pressing and cold isostatic pressing (CIP) on the green compacts and the sintered compacts of nanocrystalline WC-6Co composite powder produced by spray pyrogenation- continuous reduction and carburization technology were researched. The results showed that the pore volume distribution, density and scanning electron microscopy (SEM) morphologies of fractured surface of powder extrusion molding or die pressing followed by the cold isostatic pressing consolidation green compacts were better than that of powder extrusion molding or die pressing. The green compacts were sintered by using vacuum sintering plus hot isostatic pressing (HIP), the sintered specimens were characterized by testing density, Rockwell A hardness, saturated magnetization, coercivity force, transverse rupture strength (TRS) and atomic force microscope (AFM) images, the results showed that sintered specimen of the green body that prepared by powder extrusion molding or die pressing followed by cold isostatic pressing had excellent properties of high strength and high hardness, transverse rupture strength of sintered specimen was more than 3100 MPa, Rockwell A hardness of sintered body was more than 93. Ultrafine WC-6Co cemented carbide rods with excellent mechanical properties and fine microstructure were obtained. © World Scientific Publishing Company.

关键词： Nanotechnology

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Fabrication and properties of Ni-YSZ and Ni-Co-YSZ cermets

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International Journal of Nanoscience 2006年第2-3期5卷 225-231页

作者： Shao, Gang-Qin Li, Yong Duan, Xing-Long Cai, Hu Li, Jia Shi, Xiao-Liang Guo, Jing-Kun State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China

Ni-YSZ and Ni-Co-YSZ cermets were fabricated by hot-press-sintering from nanocomposite powders. The structure, morphology, relative density, hardness, specific heat capacity and thermal conductivity were measured. Results show that the crystalline grains are much homogeneous. Their size distribution is quite narrow and between 0.2-0.4 μm (200-400 nm). The Ni-Co-YSZ cermet reaches a maximum relative density (96.2%) at 1350°C and a maximum Rockwell hardness (70.5) at 1400°C. The specific heat capacity of Ni-YSZ cermet is larger than that of Ni-Co-YSZ cermet. The thermal conductivity of Ni-YSZ cermet is smaller than that of Ni-Co-YSZ cermet. © World Scientific Publishing Company.

关键词： Cermets

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Fabrication of monolithic bulk Ti_3AlC_2 and impurity measurement by K-value method

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中国有色金属学会会刊：英文版 2006年第B02期16卷 490-493页

作者：徐学文富成科李养贤朱教群梅炳初 School of Materials Science and Engineering Hebei University of Technology Tianjin 300130 China Hebei Communications Vocational & Technical CollegeShijiazhuang 050091 China School of Materials Science and Engineering Hebei University of Technology Tianjin 300130China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing 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

Polycrystalline bulk Ti3AlC2 material with high purity and density was fabricated by hot pressing from the powder mixture with the starting stoichiometric mole ratios of 2.0TiC/ 1.0Ti/ 1.1A1/ 0.1Si at 1 300-1 500℃. X-ray diffraction patterns and scanning electron microscopy photographs of the fully dense samples indicate that the proper addition of silicon is favorable to the formation of Ti3AlC2, consequently results in high purity of the prepared samples. The Ti3AlC2 hot pressed at 1 300℃and 1 400℃is in plane-shape with sizes of 6-8μm and 15-20μm in the elongated dimension, respectively. The purities of samples are measured by the K-value method, and the contents of TiC are given by a linear equation.

关键词：多晶单片Ti3AlC2陶瓷制造杂质纯度测量 Κ值法

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synthesis and X-ray Powder Diffraction Characterization of A New Niobate Crystal NaBa_2Li_(0.6)Nb_(4.8)Zn_(0.2)O_(15)

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Journal of Wuhan University of technology(materials Science) 2006年第1期21卷 1-3页

作者：欧阳世翕 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070ChinaChina Building Materials Academy Beijing 100024China

A new niobate compound was synthesized for the first time in Na2 O-BaO-Li2 O-ZnO-Nb2 O5 system by solid state reaction. The acw compound was studied by X-ray diffraction, electron probe, X-ray microanalysis, chemical analysis and SEM. The result of X-ray powder diffraction shows that NaBa2 Li0.6 Nb4.8 Zn0.2 O15 belongs to orthorhombic tungsten bronze structure, with space group Pba2（ 32 ） and lattice parameters a = 12.6115（2）A, b = 12.4981（2）A, C = 3.9479（3）A. The X-ray powder diffraction lines of the compoutid were well indexed.

关键词： nlobate ziac niobate structure XRD

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