脉冲等离子体微弧氧化法制备TiO2薄膜及膜层的性能研究

采用硅酸盐溶液体系，利用正交分析法得到其组分的最佳配比，用直流脉冲微弧氧化法在TA2工业纯钛基体上生成多孔的钛氧化物陶瓷膜。用X射线衍射法检测了氧化陶瓷膜的晶体结构，主要由金红石晶型构成，考查了膜的抗热冲击性、在还原性酸中的耐腐蚀能力，用紫外-可见光-分光光度计进行了氧化膜层的光催化活性研究，验证了TiO2薄膜优良的光催化特性。     

Fluorescence enhancement and cofluorescence in complexes of terbium(III) with trimellitic acid

1. Introduction Rare earth elements have an important function inlife process. The fluorescence enhancement of lan-thanides in aqueous solutions has therefore becomean area of active study in trace-level estimation oflanthanides using spectrofluorimetry [1]. Its possiblemechanism and application as fluorescence probesin biological systems have also attracted attention inrecent years [2]. Generally, fluorescence enhance-ment can be achieved through ligand sensitization.Various ligands have bee…     

Thermal expansion anomaly and spontaneous magnetostriction of Dy2AlFe14Mn2 compound

The structure and magnetic properties of Dy₂AlFe₁₄Mn₂ compound were investigated by X-ray diffractometry and magnetization measurements. Dy₂AlFe₁₄Mn₂ compound has a hexagonal Th₂Ni₁₇-type structure. Zero thermal expansion and negative thermal expansion were found in Dy₂AlFe₁₄Mn₂ compound in the temperature range from 184 to 264 K, and from 264 to 383 K, respectively, by X-ray dilatometry. The spontaneous magnetostrictive deformations from 104 to 400 K were calculated. The results show that the spontaneous volume magnetostrictive deformation increases firstly with increasing temperature, and then decreases with further increasing temperature.     

用快速冷却工艺生产高强度多相钢的实验研究

通过对含Nb微合金钢控制轧制后，进行快速冷却＋超快速冷却工艺的研究，得到了针状铁素体、板条马氏体及下贝氏体多相组织。实验钢在850℃终轧后，以高于50℃／s的冷却速度快速冷却到中间温度（600～550℃），空冷2～3s，之后采用超快速冷却至低温卷取。实验钢具有多相组织，屈服强度达到500MPa，抗拉强度明显提高，同时保证了强度和塑性的良好匹配，节约了生产时间。快冷与超快冷相结合的工艺为开发高强度微合金钢提供了新的实验手段。     

AgNO3浓度对SPE电极镀覆纳米Ag的影响

采用浸渍还原法(I-R法)在Nafion离子膜上镀覆纳米Ag,并就AgNO3浓度对SPE电极镀覆纳米银的影响作了研究.研究表明采用I-R法可制得细致Ag镀层,有效增加Ag的分散度及电极的真实面积.在还原剂浓度为0.1mol·L-1,浸渍还原温度均为50℃及浸渍还原时间分别为40 min,60 min的条件下,调节浸渍液AgNO3浓度至3.5 mmol·L-1时,可获得致密、均匀的纳米级Ag/SPE电极.同时验证砂纸糙化的预处理有利于增加Ag的负载和附着力,有利于提高Ag催化层的有效面积.     

药芯焊丝电弧焊电弧形态与熔滴过渡行为的研究

基于数码照相技术研究了CO2保护气氛下,渣系和焊接参数对药芯焊丝电弧焊（FCAW）电弧形态和熔滴过渡行为的影响。研究发现,酸性及金属芯渣系药芯焊丝在所有焊接参数下电弧扩散角相差不大,碱性渣系药芯焊丝因药芯中含大量消电离元素,大焊接参数下电弧扩散角比其它两种渣系小;金属芯药芯焊丝大焊接参数下发生“半潜弧”,可见弧长显著缩短。随着焊接参数增大,酸性,碱性,金属芯药芯焊丝均依次出现如下熔滴过渡类型;短路过渡、大滴排斥过渡、细颗粒过渡,均未发生喷射过渡。     

KBE技术在铝型材挤压模具设计中的应用

将KBE技术应用于铝型材挤压模具设计中，通过充分利用多来源的领域知识对铝型材模具设计提供最大限度支持，提高工程决策有效性。本文介绍了铝型材挤压模具KBE原型系统框架及其关键技术。     

Synthesis and electrochemical characterization of layered Li[Ni1/3CO1/3 Mn1/3]O2 cathode material for Li-ion batteries

1 INTRODUCTIONDue to the high cost of LiCoO2,a commonlyused cathode material in commercial rechargeablelithium-ion batteries , much efforts have been madeto develop cheaper cathode materials than LiCoO2,Li Ni O2and Li MnO2have been studied extensivelyas possible alternatives to LiCoO2[1 4 ]. Stoichio-metric Li Ni O2is knownto be difficult to synthesizeandits multi-phase reaction during electrochemicalcyclingleads to structural degradation,andlayeredLi MnO2has a significant drawback…     

熟料烧结过程中氧化铁反应行为的热力学分析

通过对Fe2O3与碳酸钠、氧化钙以及硅酸钙反应的热力学分析,明确Fe2O3在铝土矿炉料烧结过程中的热力学反应规律。热力学计算、分析结果表明:Fe2O3在正常烧结温度范围内能与Na2CO3或CaO发生反应,但更易与CaO反应形成2CaO.Fe2O3或CaO.Fe2O3,Fe2O3和Na2O.Fe2O3能使2CaO.SiO2和3CaO.2SiO2转变为CaO.SiO2,CaO.SiO2进一步与Na2O.Al2O3或Na2O.Fe2O3反应生成不溶的三元化合物而造成烧结法生产氧化铝过程中Na2O和Al2O3的损失。4CaO.Al2O3.Fe2O3不能由铁酸钙和铝酸钠相互反应产生,而可能是CaO、Al2O3和Fe2O3三者直接反应的产物,且在烧结条件下Na2O.Fe2O3可分解4CaO.Al2O3.Fe2O3。