基底及电解液对TiO_2纳米管阵列形貌的影响

通过中频脉冲磁控溅射的方法在ITO玻璃上沉积出致密的钛薄膜,分别以钛膜和钛箔为基底,在甘油和乙二醇为主的电解液体系中制备出TiO_2纳米管阵列,考察阳极氧化电压对纳米管形貌的影响,采用XRD、FESEM等测试手段对样品的组成、结构及形貌等进行表征。结果表明:氧化电压的增加会导致TiO_2纳米管管径和长度的增加,但氧化电压过高会造成钛箔基底TiO_2纳米管的坍塌,而ITO玻璃基钛膜上则会形成纳米深孔结构。     

纳米氧化铝对硅橡胶空间电荷特性的影响

为研究硅橡胶的空间电荷特性,开展了纳米氧化铝对硅橡胶空间电荷行为影响的试验研究。通过制备纳米氧化铝(Al2O3)改性液体硅橡胶,利用电声脉冲法(pulse electro-acoustic method,PEA法)测量了纳米氧化铝质量份数对硅橡胶空间电荷特性的影响规律。根据空间电荷消散过程计算了不同纳米氧化铝质量份数硅橡胶的陷阱深度,并分析了空间电荷对硅橡胶性能的影响机理。试验结果表明随着纳米氧化铝质量份数的提高,相同外加场强下,硅橡胶试品的空间电荷积聚量增加,撤压后消散也更为迅速,迁移率随纳米氧化铝质量份数的提高而增大,陷阱深度则随之逐渐减小。分析认为,空间电荷特性随着纳米氧化铝质量份数的增加而呈现变化归因于纳米界面效应导致的陷阱能级分裂,浅陷阱密度增大,从而使得硅橡胶中空间电荷积聚量减少,消散更为迅速。     

一种制备纳米级氧化铝的新方法

以分析纯A lC l3.6H2O为原料,采用电化学方法在常温下合成氧化铝纳米晶核,经500℃热处理2 h,粉体完全转化为γ-A l2O3,晶化比较完全;经950℃处理2 h,转化为具有完好结晶的α-A l2O3.粉体初始粒径为10 nm.与其它方法相比,该方法具有预烧温度低、操作简便、污染小、能耗低、原材料利用率高、不会引入杂质等优点.     

氧化铝填料处理对环氧浇注材料性能的影响

本文针对环氧浇注材料中存在的问题，包括填料填入最低、填料分散性差、浇注料的可使用时间短和材料的机械强度差等，用钛酸酯偶联剂对国内外填产进行处理。通过大量实验，找出一种较为理想的偶联剂、处理液配方及处理工艺，使浇注材料上述各项性能均有很大程序的改善。     

氧化铝粉体对环氧浇注体系性能影响

本文研究了电工用氧化铝填料另入量、粒形、粒度大小及分布对环氧浇注体系工艺性能及其固化物力学性能的影响。实验结果表明,适当增大填料加入量,可以有效崮化试样的弯曲及冲击强度;而氧化铝颗粒粒形及粒径的合理选择是实现改进工艺性能,提高机械强度的可靠途径。     

氧化铝填料处理对环氧浇注材料性能的影响

本文针对环氧浇注材料中存在的问题，包括填料填入量低、填料分散性差、浇注料的可使用时间短和材料的机械强度差等，用钛酸酯偶联剂对国内外填料进行处理。通过大量实验，找出一种较为理想的偶联剂、处理液配方及处理工艺，使浇注材料的上述各项性能均有很大程度的改善。     

普鲁士蓝薄膜电极的制作及充放电研究

以多孔阳极氧化铝作电极活性物质的支撑体,制备了一种新型的普鲁士蓝薄膜电极。制备过程包括纯铝片在草酸溶液中阳极氧化成多孔阳极氧化铝,电化学法去多孔阳极氧化铝的阻挡层,磷酸中扩孔,无电沉积一层钯,再在孔中组装普鲁士蓝。用扫描电镜对支撑体和电极表面形貌进行了表征,用循环伏安法对电极进行了电化学研究。结果表明,这种支撑体孔隙率大于65%,组装的普鲁士蓝(PB)薄膜电极在-0.2～0.6V和0.6～1.2V两个电位窗口内呈现两对稳定的可逆峰,由这种薄膜电极组成的微型PB薄膜蓄电池,容量达到65mC/cm2,表现出良好的充放电性能。     

添加剂对全钒液流电池电解液稳定性的影响

为获得更高浓度、更稳定的钒电池阳极电解液,在钒离子硫酸溶液中分别加入了硫酸钾、硫酸钠、硫酸锌、尿素、柠檬酸、柠檬酸钠、柠檬酸三钠和EDTA,并恒温在43℃保存。利用电位滴定分别测定钒离子硫酸溶液恒温保存1和30 d后的钒离子浓度。结果表明,硫酸钾、硫酸钠、硫酸锌、尿素等添加剂可以使钒离子硫酸溶液更稳定,而柠檬酸、柠檬酸钠、柠檬酸三钠和EDTA不适合做添加剂。     

负极氧化铝涂层对锂离子电池电性能的影响

在锂离子电池负极表面涂覆氧化铝陶瓷涂层,将其组装成Li Ni1/3Co1/3Mn1/3O2/C-Al2O3涂层体系锂离子电池,并对其倍率性能及循环性能展开研究。通过润湿角、X射线衍射(XRD)、交流阻抗(EIS)及扫描电镜(SEM)等分析方法对循环前后负极片的物相组成和微观形貌等进行了表征。研究结果表明,循环后的负极表面氧化铝颗粒形貌尺寸没有发生改变,负极界面稳定。     

片状氧化铝对环氧树脂复合材料性能的影响

本文通过熔盐法制备氧化铝纳米片,采用浇注法制备氧化铝/环氧树脂(Al₂O₃/EP)复合材料,并对氧化铝结构及复合材料性能进行表征和测试。结果表明：Al₂O₃纳米片的掺杂可以显著提高环氧树脂复合材料的导热性能和击穿性能,当Al₂O₃的质量分数达到70%时,复合材料的导热系数与纯环氧树脂相比提高了4.56倍,电气强度由纯环氧树脂的48.8 kV/mm提高到58.5 kV/mm,提升了约19.88%。同时,复合材料的介电性能随着氧化铝含量的增加有明显的提升。     

硫酸溶液中阳极Pb(Ⅱ)膜研究进展

讨论了铅在硫酸溶液中生长的阳极Pb(Ⅱ)膜的物相组成、膜的生长与相转化过程及其光电化学性质等方面的研究进展.     

模板法合成的CoFe2O4纳米管的结构与磁性

利用阳极氧化铝(AAO)模板,用化学方法合成了三种不同孔径的CoFe2O4(CFO)纳米管.X射线衍射(XRD)分析表明,纳米管由无择尤取向、立方尖晶石结构的多晶CoFe2O4构成;透射电镜(TEM)观察显示,随着纳米管直径的增大,管壁厚度和CoFe2O4颗粒直径随之增大;进一步的磁性测量表明,纳米管阵列的矫顽力、磁滞回线的矩形比也随着纳米管直径的增大而增大.     

Effect of Solution Processing on PZT Thin Films Prepared by a Hybrid MOD Solution Deposition Route

Lead zirconate titanate, Pb(Zr_0.53Ti_0.47)O₃ (PZT), thin films were prepared by a hybrid metalorganic decomposition (MOD) solution deposition route; the effects of processing conditions on the film structure and properties were investigated. Solutions were synthesized by mixing and reacting Zr acetylacetonate and Pb acetate trihydrate with a solution prepared from Ti isopropoxide, acetic acid and water. Chemical changes in the solution during preparation and solution storage (i.e., aging) were investigated by visual observation and FTIR, and were evidenced by changes in phase content and properties of the final PZT films. Results suggest that Zr acetylacetonate and Pb acetate trihydrate react with a Ti oxoacetate-based precursor, and that this reaction continues during aging at room temperature. The PZT film quality and properties improved with aging time of the solution before deposition. To achieve good properties and design a convenient processing route, an accelerated aging scheme, including a brief aging at 60°C and freezing to prevent further reaction, was developed. PZT films prepared from these solutions had average dielectric constants of 1040, loss tangents of 0.05, remnant polarizations of 26 C/cm², and coercive fields of 39 kV/cm.     

Effect of Thickness on the Electrical and Optical Properties of Sb Doped SnO2 (ATO) Thin Films

This work reports the preparation and characterization of (SnO₂) thin films doped with 7 mol% Sb₂O₃. The films were prepared by the polymeric precursor method, and deposited by spin-coating, all of them were deposited on amorphous silica substrate. Then, we have studied the thickness effect on the microstrutural, optical and electric properties of these samples. The microstructural characterization was carried out by X-ray diffraction (XRD) and scanning tunneling microscopy (STM). The electrical resistivity measurements were obtained by the van der Pauw four-probe method. UV-visible spectroscopy and ellipsometry were carried out for the optical characterization. The films present nanometric grains in the order of 13 nm, and low roughness. The electrical resistivity decreased with the increase of the film thickness and the smallest measured value was 6.5 × 10^{– 3} cm for the 988 nm thick film. The samples displayed a high transmittance value of 80% in the visible region. The obtained results show that the polymeric precursor method is effective for the TCOs manufacturing.     

透气砖底吹铝熔体精炼过程中气液两相流场的数值模拟

利用双流体模型和多孔介质模型对透气砖底吹的铝熔体精炼过程中的气液两相流场进行了数值模拟,考察了不同透气砖布置方式对流场产生的影响。结果表明：净化气体主要分布在透气砖的上方区域,且气体在除气室中的气泡上升速度总体比较均匀;相比于3×4方案,采用1×8方案的气泡在除气室中停留时间更长,总体平均气含率更高,铝熔体能与足够数量的净化气体充分接触,有利于铝熔体的除氢。     

铝合金在输变电构架中的应用

以往在输变电构架中应用铝合金构件主要从电力工艺出发,较少考虑建筑结构方面,部分原因是缺少相应设计规范。近年来,国内外相继出台了铝合金结构设计规范,并且铝合金构件重量轻,易于安装和运输,通常在空气中不腐蚀,具有优异的强度/重量比及较高的可回收性,这些导致其在输变电构架中的应用前景广。实例表明铝合金结构在国外输变电工程已有成功应用实例。铝合金结构与钢结构全寿命经济比较表明,输变电构架中应用铝合金结构的投资基本是钢结构的1.2～1.5 倍。     

Tin Oxide Thin Films Grown on the (1012) Sapphire Substrate

Tin oxide thin films were deposited on the R-cut sapphire substrate by the electron-beam evaporation of a ceramic SnO₂ source. X-ray diffraction and transmission electron microscopy studies revealed that the films deposited at lower temperatures were amorphous while those grown at temperatures above 350°C consisted of the -SnO phase with the PbO type structure. Epitaxial -SnO films on the R-cut sapphire substrate were obtained when deposited at 600°C. Atomic force microscopy studies showed that films deposited at low temperature have a smooth surface, while epitaxial SnO films deposited at high temperatures (above 600°C) have a relatively rough surface. The atomic mobilities in the films at the various deposition temperatures and the lattice mismatch between the films and the substrates ultimately determine the microstructure and surface mophology. X-ray photoelectron spectroscopy analysis shows that the Sn/O ratios are 52.7/47.6 for the amorphous film deposited at the ambient temperature (30°C), 48.8/51.2 for the films deposited at 350°C, and 49.2/50.8 for the epitaxial film deposited at 600°C. Electrical properties were determined by four point probe measurements.     

中强度全铝合金导线在输电线路中的应用

中强度全铝合金导线(all aluminum alloy conductor,AAAC)在制造、设计、施工、运行等方面具有诸多优点,已在世界上许多国家的输电线路上应用,而在我国尚未采用。实践证明,中强度AAAC与同直径的钢芯铝绞线(aluminumconductor alloy reinforced,ACSR)相比,在节约电能损耗、微风振动等方面更具优势,值得推广。     

中强度全铝合金导线在输电线路中应用

中强度全铝合金导线（all aluminum alloy conductor,AAAC）在制造、设计、施工、运行等方面具有诸多优点,已在世界上许多国家的输电线路上应用,而在我国尚未采用。实践证明,中强度AAAC 与同直径的钢芯铝绞线（aluminum conductor alloy reinforced,ACSR）相比,在节约电能损耗、微风振动等方面更具优势,值得推广。