Synthesis and characterization of multidoped lithium manganese oxide spinel LiCo0.02La0.01Mn1.97O3.98Cl0.02

1 Introduction The cathode material plays an important role in the performance of lithium ion batteries. Lithium transition metal compounds with layered and spinel structure are favourites among cathode materials for lithium rechargeable batteries. In thi…     

Effects of silicocalcium on microstructure and properties of Mg-6Al-0.5Mn alloy

1 Introduction Magnesium alloys are attractive for applications in the automobile, aerospace and electronic industries due to their light mass, high stiffness, high specific strength, good dimensional stability and damping capacity. It is the lightest sp…     

Preparation and characterization of TiO2 photoelectrode codoped with aluminum and boron and its application in dye-sensitized solar cell

Nanocrystalline titania films codoped with aluminum and boron were prepared by cathodic vacuum arc deposition. In the process, titanium alloy target was used under an O2/Ar atmosphere, and sensitization of films were carried out by natural dye-sensitized complex in anhydrous ethanol. The structure, surface morphology and UV-vis spectra of titania films codoped were measured by X-ray diffraction analysis, scanning electron microscopy and ultraviolet-visible spectrometer. Theas-deposited films are found to be amorphous. The films annealed were examinedto be of anatase structure with orientation along the (101) planes, the averagecrystal size is in the range between 41 and 45 nm. SEM results show that thereare some pores in the codoped titania films, the optical properties of the dye-sensitized films were also measured which reveals that the spectral responses of films shift to the visible region. Under simulated sunlight illumination, the overall energy conversion efficiency of dye-sensitized nanocrystalline solar cell is 0.9%.     

氟化镧对镍基自润滑合金力学性能及高温摩擦学特性的影响

用粉末冶金热压方法制备了含不同LaF3添加量的Ni-Cr-Mo-Al-Ti-B-MoS2-LaF3系宽温度范围自润滑合金，测试了合金力学性能及与Al2O3陶瓷配副下的高温摩擦磨损性能。研究结果表明，合金的力学性能随LaF3添加量的增加而降低，但其减摩耐磨能力随LaF3添加量的增加而提高。合金中的硫化物（CrxSy,Mo2S3和AlLaS3)是合金低温范围内（室温至300℃）自润滑的主要因素；高温摩擦时（400－700℃）合金表面氧化物和残余硫、镧的化合物及地偶表面转移膜中氧化物与复合氧化物的协同作用是摩擦因数进一步降低的原因。     

扩散阻挡层对Cu-Zr纳米合金膜电阻率与残余应力的影响

用磁控溅射和离子束溅射共沉积的方法分别在以单晶硅为基体的TiN,TaN,ZrN扩散阻挡层上沉积了Cu-Zr合金膜,膜在400℃氮气中退火1h.结果表明扩散阻挡层对膜的晶体取向、电阻率和残余应力有很大影响.沉积态的膜具有强的（111）取向,且峰型严重展宽;退火后峰型明显锐化,出现（200）等晶体取向;对应TiN,TaN;ZrN三种扩散阻挡层,膜的电阻率在沉积态时分别达108,327和478μΩ·cm,退火后降至正常的数个μΩ·cm;扩散阻挡层亦可明显降低膜的残余应力,无扩散阻挡层时膜的退火应力达475MPa,有ZrN扩散阻挡层后退火应力降至149MPa.     

硅锰稀土元素对铸态锌基合金组织性能的影响

采用正交组合回归设计实验方法，研究硅、锰元素对持态锌基合金力学性能的影响规律。结果表明，硅、锰元素对锌合金的室温硬度、100℃硬度、抗压强度和冲击韧性都有显著影响。适当控制硅、锰含量、并加入稀土元素进行变质处理，可得到具有较高强韧性的耐磨锌合金。     

Tribological properties of 2024 aluminum alloy plasma-based ion implanted with nitrogen then titanium

1　INTRODUCTIONOwingtolowdensityandhighspecificstrength ,aluminumanditsalloysareextensivelyusedinmanyfields ,especiallyinaviationandspaceindustry .Butlowhardnessandlowwearresistanceoftenlimittheirengineeringapplications .Surfacemodificationforalu minumanditsalloysbyionimplantationoffersthepossibilityofwideningtheirapplicationswherehighwearresistanceandlowdensityarerequired[15] .Sincenitrogenionisconvenienttoobtainandeasytocontrol,andAlNhasexcellentmechanicalproperties ,nitrogenionimplant…     

α淀粉对型砂性能和铸钢件表面质量的影响

研究了α淀粉对型砂性能和铸钢件表面质量的影响。结果表明，α淀粉是综合性能较好的防止铸钢件表面粘砂的型砂附加物，加入面砂中能有效地改善铸钢件表面质量。     

高强度ZL205A合金大型铸件"白点"偏析研究

对ZL205A合金某大型铸件进行探伤检测,在底片上发现了白色点状偏析组织(以下简称“白点”偏析)。铸造工艺调整以及热处理不能使之减轻或消除。文中对ZL205A合金白点偏析进行研究,测试了偏析组织的力学性能,分析了偏析组织的微观形貌及化学成分,并探讨了其形成机理及防止措施。     

铝合金激光焊接的工艺特点及发展现状

概述了铝合金激光焊接的工艺特性及难点，提出改进措施，并指出了铝合金激光焊接技术的研究现状及未来的发展方向。