低压电容铝箔的成分、热处理、显微结构和比电容之间关系的研究

本文评述了低压电容铝箔的成分、热处理、显微结构和比电容之间的关系,所得结论是:(1) 硬态高纯铝箔由于有高的位错密度,在腐蚀、形成之后的比电容比退火铝箔高;(2)高纯铝箔经过适当热处理后的比电容,随表面立方织构分数的增加而增大;(3)某些微量元素使退火高纯铝箔的位错密度和表面立方织构分数都得到增加,因而更有效地增大其比电容;(4)退火铝和铝合金箔的晶粒尺寸对比电容没有明显影响。     

高压阳极电容铝箔生产工艺对立方织构的影响

综合分析了高压阳极电容铝箔生产工艺对立方织构的影响，包括化学成分、热轧，冷轧及热处理工艺等，力求最大程度地增加铝箔中立方织构的含量，以达到提高铝电解电容器比电容和组织均匀化的目的。     

阳极复膜法制备铝箔金相试样及组织观察

介绍了一种阳极复膜法观察铝箔显微组织的方法，用此方法可以观察到寒带的晶粒组织，并可同时显现出位错坑和晶粒形貌，利用位错坑方向、数量和晶粒的色彩还可以分析铝箔表面的织构取向。     

中间退火对高纯铝箔立方织构的影响

采用晶体取向分布函数（ODF）研究和分析了中间退火对高纯铝箔立方织构的影响。研究结果表明：中间退火对高纯铝箔冷轧形变织构影响不大,但对成品退火箔材中立方织构和R织构含量产生重要影响,在300C/2h中间退火条件下,成品箔材中再结晶立方织构物取向密度最大,R织构含量较小。     

冷轧形变量对异步轧制高纯铝箔织构的影响

应用取向分布函数(ODF)研究和分析了异步轧制高纯铝箔的形变织构和再结晶织构.结果表明:异步轧制高纯铝箔的形变织构除了C{112}<111>、B{110}<112>和S{123}<634>织构组分外,还有较强的CubeND{001}<110>和{102}织构.异步轧制高纯铝箔的再结晶织构由强的立方织构{001}<100>和弱的R{124}<211>织构组成.随着形变量的增加,异步轧制高纯铝箔的形变织构和再结晶织构呈现规律性的变化,{102}织构减少,S织构先增后减,速比较小时C织构近线性减少,速比较大时C织构则先增后减.异步轧制高纯铝箔的退火样品中有很强的立方织构,这与异步轧制提高高纯铝箔的形变储能有关,形变量过大时,立方织构随形变量的增加急剧减少.{102}织构有利于再结晶立方织构的加强.     

微量稀土对高压阳极电容铝箔织构演变的影响

采用晶体取向分布函数方法（ODF）和X射线衍射测定板面晶面衍射强度研究和分析了在高纯铝加入微量稀土（Y）对箔材织构演变的影响。研究结果表明：添加微量稀土，能改变高纯铝箔中变形织构组分的相对强度，随稀土含量增加，黄铜取向密度增加，S织构组分减少，成品退火箔材中立方织构含量随稀土含量增加就相应减少。当稀土含量为0.0030%时，成品退火箔材中立方织构取向密度最大。其作用机理是稀土元素Y化学活性强，能与铁等微量杂质元素形成一系列化合物，析出后可净化基体，降低基体中铁等杂质的浓度，消除杂质元素对高纯铝箔中立方织构形成的不利影响。     

电容器阳极铝箔工艺研究现状与发展

论述了影响中高压铝电解电容器用高纯铝阳极箔立方织构比例及力学性能的各种因素,分析了阳极箔生产过程中均匀化退火、热轧、预备退火、成品退火等工艺过程对立方织构及综合性能的影响,提出了提高阳极箔性能的工艺发展方向.     

中间退火及成品退火速率对高压阳极铝箔微观组织的影响

采用不同中间退火温度及成品退火速率对高压阳极铝箔进行处理,并利用EBSD及XRD技术分析其微观组织结构,尤其是织构的变化规律。结果表明,中间退火温度对后续成品退火中形成立方织构起到了关键作用,这可能是由于低温中间退火保留了大量的形变储能,为成品退火时立方织构的形成增加了形核核心。同时,低的中间退火温度造成立方织构较理想位置偏转程度更大。随着成品退火加热速率的增大,铝箔再结晶分数及再结晶晶粒尺寸逐渐减小,这是由于退火加热速率的增大(低于临界加热速率),缩短了晶界迁移的时间,减缓了再结晶的发生。     

铝阳极箔点蚀扩面机制及影响因素的研究进展

概述了铝阳极箔点蚀萌生的机制研究,阐述了直流电解腐蚀过程中高纯铝的性质(微量元素和立方织构)、电解液参数(氯离子浓度、硫酸根离子浓度、温度和缓蚀剂)以及外加极化电流等因素对铝箔点蚀萌生、蚀孔生长及增容的影响研究进展。     

CGO硅钢初次再结晶组织及织构演变规律

对3%(质量分数)Si CGO硅钢冷轧板进行初次再结晶退火实验,设置不同的退火保温时间,将退火后的样品分别使用OM,TEM及EBSD进行分析,观察其微观组织、位错及织构分布,研究CGO硅钢初次再结晶过程中组织及织构的演变规律。结果表明:随着退火保温时间的延长,回复再结晶的程度增加,当保温时间延长至300s时,再结晶基本完成且呈现等轴晶状态,随着保温时间的延长,组织中位错密度降低。初次再结晶退火保温时间对初次再结晶织构分布有影响:随着保温时间的延长,{111}〈112〉和{110}〈112〉织构含量不断下降,{111}〈110〉织构的含量先减少后增加,立方及旋转立方组分基本保持不变,Goss织构组分逐渐增多。当保温时间较短时,晶粒取向差主要为小角度晶界并存在大量亚晶,随着保温时间的延长,大角度晶界逐渐增多。     

A Novel Potassium‐Ion‐Based Dual‐Ion Battery

In this work, combining both advantages of potassium‐ion batteries and dual‐ion batteries, a novel potassium‐ion‐based dual‐ion battery (named as K‐DIB) system is developed based on a potassium‐ion electrolyte, using metal foil (Sn, Pb, K, or Na) as anode and expanded graphite as cathode. When using Sn foil as the anode, the K‐DIB presents a high reversible capacity of 66 mAh g^?1 at a current density of 50 mA g^?1 over the voltage window of 3.0–5.0 V, and exhibits excellent long‐term cycling performance with 93% capacity retention for 300 cycles. Moreover, as the Sn foil simultaneously acts as the anode material and the current collector, dead load and dead volume of the battery can be greatly reduced, thus the energy density of the K‐DIB is further improved. It delivers a high energy density of 155 Wh kg^?1 at a power density of 116 W kg^?1, which is comparable with commercial lithium‐ion batteries. Thus, with the advantages of environmentally friendly, cost effective, and high energy density, this K‐DIB shows attractive potential for future energy storage application.     

A study of precipitation and recrystallization behaviour of aluminium alloy AA1235

The recrystallization behaviour of 92% cold rolled commercial pure aluminium has been studied. Annealing was done at different conditions to evaluate the effect of recrystallization temperature and time on the microstructure and texture of the alloy along with a study of subsequent precipitation. Variation of orientation between grains has been studied by the orientation imaging microscopy (OIM). During precipitation, cube component {001}<100> has dropped and rolling texture component has increased comparatively. Recrystallization texture is the combination of cube, rolling and random texture. However, during grain growth strong cube grains have formed. A significant number of dislocations are present during grain growth owing to the pinning effect of Al₃Fe particles.     

微变形对强立方织构铝箔腐蚀发孔的影响

利用蚀坑法对强立方织构铝箔腐蚀发孔的机理进行了研究,通过对退火铝箔施加拉伸微变形,使箔内位错密度急剧增加,蚀孔数目以及面积比均得到提高.实际生产中该方法可用于提高高纯铝箔腐蚀的发孔率.     

因瓦合金箔电沉积工艺的研究

对硫酸盐-氯化物电解液体系(含有LGJ复配稳定剂和添加剂)中电沉积因瓦合金箔的工艺进行了研究,讨论了电解液组成、电流密度、温度及pH值等因素对合金箔组成的影响,得到了制备因瓦合金箔的最佳镀液组成及工艺条件。阴阳极面积比为2∶1时,通过实验确定镍铁联合阳极面积比为1.8∶1。在上述条件下,实验获得组成稳定(Fe 64±2%)和性能优良的合金箔。通过SEM、EDS和XRD对因瓦合金箔的形貌及结构进行测定分析,表明合金箔晶粒细致、尺寸均匀、结构紧密、表面光滑平整、无孔洞和裂纹、晶粒结构为(111)、(200)、(311)及(222)织构,并表现为较强的(111)择优取向。     

Dynamic observation of dislocation-free plastic deformation in gold thin foils

Ductile fracture of metals produces a thin foil portion, which is observable by transmission electron microscopy, at the fractured edge. The thin foil portion shows unusual deformation microstructure, which contains no dislocations, but contains vacancy-type point defect clusters at extraordinarily high density. Dynamic observation of the deformation process revealed that these defect clusters are produced in the portion of local heavy deformation; however, no dislocation motion was observed during the course of the heavy plastic deformation, constituting direct evidence that the unusual deformation microstructure is produced by plastic deformation without dislocations. Also, the deformation was found to involve 14% elastic deformation, indicating that the dislocation-free plastic deformation occurs under an extraordinarily high internal stress level of more than 10 GPa, which is comparable to the ideal strength of metals. Furthermore, during the dislocation-free plastic deformation, equal-thickness fringes were found to disappear temporarily, suggesting that instability of crystalline state under extraordinarily high internal stress level is a key factor for the mechanism of dislocation-free plastic deformation.     

Tailoring the microstructure and improving the discharge properties of dilute Mg-Sn-Mn-Ca alloy as anode for Mg-air battery through homogenization prior to extrusion

Mg-0.5Sn-0.5Mn-0.5Ca(wt.%) alloys with different microstructures are designed through casting and extrusion with and without homogenization treatment prior to extrusion(HPE).The influence of HPE treatment on the microstructural characteristics and resultant discharge properties of Mg-Sn-Mn-Ca alloy in extruded condition as anode for Mg-air battery was investigated.HPE treatment exerts a prominent effect on the grain structure and orientation,distribution of the second phase particles as well as the dislocation density of the extruded alloy.The HPE alloy exhibits a distinctly high cell voltage together with specific energy compared with that of Non-HPE one.Intermittent discharge tests confirm that the HPE alloy possesses a more excellent discharge activity and more stable discharge process than the NonHPE one.All results demonstrate that the HPE alloy is an attractive anode material for Mg-air battery with long-term storage and under intermittent discharge.     

Effect of thermo-process on anodic capacitor foil manufacturing for AC etching

This investigation studies the anode foil of an aluminum electrolytic capacitor. The electrochemical behavior of high-purity aluminum foils with various thermal treatment parameters was examined. The static capacity increased with the temperature of homogenization treatment and hot rolling. The foil then has fine pits, which are uniformly distributed. Because of stabilizing treatment scattered dislocations and preferred orientation, the stabilized sample had better static capacity than the non-stabilized sample.     

Directing Highly Ordered and Dense Li Deposition to Achieve Stable Li Metal Batteries

Li metal anode is promising to achieve high-energy-density battery. However, it has rapid capacity fading due to the generation of inactive Li (dead Li), especially at high current density. This study reveals that the random distribution of Li nuclei leads to large uncertainty for the further growth behavior on Cu foil. Here, periodical regulation of Li nucleation sites on Cu foil by ordered lithiophilic micro-grooves is proposed to precisely manipulate the Li deposition morphology. The management of Li deposits in the lithiophilic grooves can induce high pressure on the Li particles, leading to the formation of dense Li structure and smooth surface without dendrite growth. Li deposits comprising tightly packed large Li particles largely reduce the side reaction and the generation of isolated metallic Li at high current density. Less dead Li accumulating on the substrate significantly prolongs the cycling life of full cells with limited Li inventory. The precise manipulation of the Li deposition on Cu is promising for high-energy and stable Li metal batteries.