TiC_xN_(1-x)铝箔电极材料耐蚀性能研究

通过测试极化曲线和浸泡腐蚀实验,对比分析了最佳沉积工艺下制备的TiCxN1-x涂层铝箔与腐蚀化成法制备的铝箔的耐蚀性能。结果表明,在酸性腐蚀溶液中,TiCxN1-x涂层铝箔的自腐蚀电位Ecorr比腐蚀化成铝箔高50mV,而电流密度低0.914×10-3A/cm2,说明TiCxN1-x涂层铝箔的耐腐蚀性能明显优于腐蚀铝箔,同样,在浸泡9h后腐蚀铝箔样片已出现腐蚀贯穿,而TiCxN1-x涂层铝箔没有明显变化。     

AlCl_3溶液浸泡对非铬酸系铝箔化成速度及比电容的影响

在室温下,先用NaOH溶液对非铬酸系高纯阳极铝箔进行预处理,再用0.1 mol/L的AlCl3溶液浸泡20 min,然后对铝箔进行腐蚀,清洗及化成。研究了AlCl3溶液浸泡对铝箔化成速度及化成箔比电容的影响。结果显示:在530 V电压化成时,与普通铝箔相比,经AlCl3溶液浸泡过的铝箔的化成时间缩短约了3 min,化成箔的比电容提高了大约4.6%,达到0.612×10–6 F.cm–2。     

微通道板表面羟基化工艺研究北大核心

研究了3种微通道板基底羟基化的方法,测量了羟基化处理后微通道板基底表面水接触角及通道端面的形貌变化,分析了各种方法中微通道板基底的亲水性和腐蚀情况。实验结果表明:氨水双氧水溶液对基体表面的亲水性能提升不大,NaOH溶液对基体有腐蚀作用,经食人鱼溶液处理的基体表面亲水性明显提高且无腐蚀作用。研究了微通道板在食人鱼溶液中的浸泡时间和浸泡温度对表面亲水性的影响。结果表明:随着浸泡温度的增加,微通道板表面水接触角先减小后增大,当温度为80℃时达到极小值,浸泡时间对微通道板表面的亲水性影响不大。最终确定了微通道板表面羟基化工艺:浸泡温度为80℃,静置时间为20~60 min。     

低压电子铝箔耐蚀性的研究与应用

采用对比实验,研究了腐蚀工艺对低压电子铝箔耐蚀性的影响。当腐蚀溶液中w(HCl)为15%～25%、w(H2SO4)为10%～20%,温度为85℃,电流密度为0.40A/cm2,腐蚀时间为3min时,铝箔腐蚀效果最佳,其耐蚀性数值(腐蚀前后质量差值与原光箔质量之比)为0.70%～0.83%。该工艺可迅速准确地判断低压电子铝箔的耐蚀性,平均每个样品所花时间仅为26min。     

化成前处理对提高铝箔比容的影响

利用化成前引入高介电常数金属氧化物的方法,研究了TiO2涂层对提高铝箔比容的影响。结果表明:腐蚀箔在6%(质量分数)钛酸乙酯的乙醇溶液中,浸泡5 s,然后在450 恒温10 min,在210 V下有机酸化成,阳极氧化膜的结构与性能得到改善,铝箔比容可提高10%,从而可有效提高形成效率。     

多弧离子镀制备高比电容铝箔的研究

通过控制乙炔与氮气流量比和冷却方式,采用多弧等离子体辅助物理气相沉积法(PVD),制备了不同比电容的TiCN涂层铝箔,借助比容测试仪、发射扫描电镜、X射线衍射分析仪及电子探针等,检测其比电容及显微形貌、晶体结构和化学成分。结果表明,PVD法可以获得高比电容铝箔(1674×10-6F/cm2);采用液氮快速冷却方式可以获得非晶态的TiCN纳米涂层,比电容比随炉冷却的约提高两倍;乙炔和氮气体积流量比为1:1较之1:0.5时,铝箔的比电容提高1.5～2.5倍。     

预处理对阳极铝箔腐蚀特性的影响

采用正交试验方法,研究了H3PO4溶液、HNO3溶液和A电解液(HCl和H2SO4组成的环保型体系)三种预处理方式分别对后道工序铝箔腐蚀发孔行为的影响。结果表明:用A电解液预处理不但易于生产控制,而且提高了铝箔产品的比容档次和质量一致性,较之H3PO4溶液、HNO3溶液处理,比容提高了2%,其离散率从9%下降到了6%,同时降低了制造成本和环保压力。     

电解质中微量金属离子对高纯铝箔直流电蚀特征的影响

在盐酸-硫酸-硝酸电解质体系下,分別加入微量Cu~(2+)、Fe~(3+)、Zn~(2+)等金属离子,并采用直流方式对高纯铝箔进行电化学侵蚀,研究了改性后的电解质溶液对高纯铝箔电蚀过程的影响。结果表明:在硫酸-盐酸-硝酸电解体系中加入微量Cu~(2+)后,能够和铝发生置换反应生成铜单质沉积在铝箔表面,形成Cu-Al微电池反应,促进铝箔腐蚀,隧道孔密度增大,隧道孔长度从10μm增长到30μm,220V化成的比容提高了78%-220%;加入Fe~(3+)后,不能形成微电池反应,对铝箔腐蚀没有明显影响;加入Zn~(2+)后,能够形成Zn-Al微电池反应,促进铝箔腐蚀,但促进效果弱于加入Cu~(2+)。     

废弃动力锂离子电池正极材料回收利用标准化动态

介绍了我国废弃动力锂离子电池正极材料回收利用行业现状以及欧盟《新电池法案》关于废弃电池材料回收的要求。根据产业形势、正极材料回收与修复技术现状,对我国动力锂离子电池正极材料回收利用标准化现状进行分析并提出标准需求,重点对目前在编的两项锂离子电池正极材料回收、修复利用的电子行业标准中回收工艺和修复工艺内容进行研究,探讨了下一步亟待标准规范的内容。     

电解电容器的制造

电解电容器的特点是体积小,电容量大,适用于无线电收音机与电子仪器滤波及旁路等要求大容量的电路中.其构造是由高纯铝箔经过腐蚀赋能后作为正极,再由工作电解液作为负极,用电解电容器纸卷绕成.外壳有用铝质的,有用纸质的,也有用胶木的.现将制造电解电容器的过程及机理简述如下.     

Preparation and Characterization of Sol–Gel Dip Coated Al: ZnO (AZO) Thin Film for Opto-Electronic Application

Semiconductors - Aluminum doped zinc oxide (AZO) thin film was prepared by sol–gel dip coating method from methanol and monoethanolamine respectively, used as solvent and stabilizer agent....     

Low-Temperature Sintering with Nano-Silver Paste in Die-Attached Interconnection

Traditional materials used in chip-level interconnections are not compatible with the high-temperature operation of wide-bandgap high-power semiconductor devices; therefore, this paper studies sintered nano-silver as a novel interconnect material mounting semiconductor devices onto metallized substrates. A low-temperature sintering process was employed in the preparation of a sintered nano-silver die-attachment. The physical mechanisms in volatilization and burnout of the added organic components employed in nano-silver paste were analyzed primarily by thermal gravimetric analysis (TGA) to obtain a reasonable temperature-controlling profile. The shear strength of sintered nano-silver joints was investigated, and the evolution of microstructure in the nano-silver paste sintering process was observed using a scanning electron microscope (SEM) in this process. The effects of sintering temperature, heating rate, and holding time during the sintering process were analyzed according to the densification mechanism. The microstructural observations and shear strength tests showed that a sintering temperature of 285°C, heating rate of 10°C/min, and holding time of 60 min were the best conditions for using this kind of silver paste.     

绿色照明用铝电解电容器的研制

通过合理选用原材料、正确设计零部件、开发高稳定工作电解液、使用负极贴箔技术,配合极片与导针间接触电阻的控制、芯包铝箔粉尘的清除以及浸渍和装配的特殊工艺措施,研制出耐高温、耐大纹波电流、长寿命(130℃,2 000 h或105℃,8 000 h)铝电解电容器,满足高品质绿色照明用产品的要求。     

Ether solvent treatment to improve the device performance of the organic light emitting diodes with aluminum cathode

By treating the organic/metal interface between the light emission layer and the cathode with ether solvent, the device performance of the organic light-emitting diodes with aluminum cathode is significantly improved. The maximum luminous efficiency is not only more than thirty times higher than that of the device without any ether solvent treatment, but also higher than the device with regular low work function metal cathode, such as Ba/Al. The enhanced efficiency results from the reduction of electron injection barrier, which is confirmed by the photovoltaic measurements. X-ray photoelectron spectroscopy study reveals that the formation of a carbide-like layer by the reaction between the thermally evaporated aluminum and the ethylene oxide functional group, –CH₂CH₂O–, helps the electron injection.     

低压铝箔矩形波交流电预处理探析

在低酸度电解液中对高纯低压电子铝箔采用低频矩形波交流电的预处理工艺,产生较为均匀的初期蚀孔,使得后段腐蚀过程铝箔表面溶解减少,海绵层厚度增加,比电容量提高。具体分析了预处理矩形波交流电电流频率f、电流密度J、处理时间t、处理温度θ以及cAl3+/ cH+值对比电容量C的影响。     

Preparation of nanocomposite thin films by sol-gel and photochemical metal–organic deposition of Ba0.5Sr0.5TiO3 and PbZr0.48Ti0.52O3

The process for generating nanocomposite films constructed from alternate thin film layers of Ba_0.5Sr_0.5TiO₃ and PbZr_0.48Ti_0.52O₃ by photochemical metal–organic deposition and sol-gel has been investigated. By spin coating the appropriate metal organic precursors to Ba_0.5 Sr_0.5TiO₃ followed by photolysis a single layer of amorphous Ba_0.5Sr_0.5TiO₃, is produced. Subsequent spin coating of the appropriate metal organic precursors of PbZr_0.48Ti_0.52O₃ and photolysis led to the formation of a layer of amorphous PbZr_0.48Ti_0.52O₃. By repeating this procedure a material composed of alternating layers of BST and PZT was constructed. In an analogous process alternate coating and heating of the appropriate sol-gel precursors was used to make similar structures. These nanocomposite materials were formed as amorphous layered materials but could be made to crystallize by heat treatment. Heat treatment resulted in crystallization of the films although the resultant diffraction pattern was dependent upon the thickness of the layers. X-ray diffraction patterns of both BST and PZT were apparent in crystalline films formed from layers of more than 25 nm in thickness. The crystallization of films formed from layers less than 25 nm in thickness showed only a lattice constant intermediate between that expected for BST and PST consistent with the interdiffusion of these components. Atomic force microscopy indicated that the amorphous nanocomposite films were near featureless while the crystalline films had a much higher surface roughness.     

Modifying organic/metal interface via solvent treatment to improve electron injection in organic light emitting diodes

By simply spin-coating the solvents, such as ethanol and methanol, on top of the organic active layer, the performance of polymer organic light-emitting diodes is significantly enhanced. The quantum efficiency is increased by as large as 58% for low work function Ba/Al cathode devices after solvent treatment. An interface dipole between the organic layer and the metal layer induced by the solvent, either from the intrinsic dipole or the interaction between the solvent and the cathode metal, is responsible for the device performance improvement. The interface dipole layer, which is confirmed by the Kelvin Probe Force Microscopy and the photovoltaic measurements, lifts the vacuum level on the metal side, thereby reducing the electron injection barrier at the organic/metal interface, and leading to better device performance.     

Ultrasonic embedding of nickel-coated fiber Bragg grating in aluminum and associated sensing characteristics

Fiber Bragg Gratings (FBGs) were embedded in metal foil using ultrasonic welding processes. Ultrasonic welding embedding processes, cross-sections of welded samples, the form change and wavelength shift of the Bragg peak during the processes, as well as the sensing characters of embedded FBGs were investigated. To understand the effects of metal foil properties on fiber embedding, optical fibers were embedded in similar and dissimilar metal foil samples. In order to study the effects of protective coating properties on the embedding processes, bare fibers, chemical nickel-plated fibers and chemical-electro nickel-plated fibers were compared in the ultrasonic welding process. Results indicate that only chemical-electro plated fibers and FBGs were successfully embedded in aluminum foils due to good protection and an appropriate matrix metal. Examination of the form change and wavelength shift shows that the FBGs are preserved well after the plating and ultrasonic welding processes. Thermal sensing results show that temperature sensitivity of the FBG was enhanced after chemical-electroplating and further enhanced after embedding in aluminum, which resulted from different thermal expansion coefficients of the SiO₂, aluminum and the nickel layer. Strain sensing results show (i) the embedded FBG remains in good condition when a cyclic tensile load (0–40 N) is applied; (ii) the relationship between wavelength and the applied load shows a linear trend.     

柔性有机电致发光器件的寿命

综述了柔性有机电致发光器件(FOLED)的研究现状和发展趋势;针对提高其寿命问题的研究,选择和比较了聚合物、金属箔片、超薄玻璃3种柔性衬底材料的优缺点及发展概况;结合本课题组的实验分析,说明设计并选择合理的器件结构、发光材料和阴极材料对延长器件的使用寿命非常有效;提高FOLED寿命的另一重要步骤是减少水蒸汽和氧气向器件内部的渗透,最后也简介了以聚合物和超薄玻璃为衬底材料的器件封装方法。     

用于高功率CO2激光器反射镜的研究

本文讨论了一种用于高功率CO2激光器反射镜的设计、制备、测试及冷却,比较了反镜基底材料的优劣。应用表明:这种反射镜远优于铜基底镀金的反射镜。