Fabrication and Testing of Metal Foil Planar Switch

A metal foil spark gap switch is fabricated by using magnetron sputtering deposition technology and standard microelectronic technology. The switch has two main electrodes and a trigger electrode. Stylus profiler is employed to measure the distance between the main electrodes and the dimensions of the trigger electrode. The discharge characteristics of the metal foil spark gap switch are discussed. The switch has short delay time and low time jitter. When it is fired by a conventional capacitive discharge unit (CDU), the firing circuit has low inductance and resistance. Because of its low profile structure, it can be easily integrated with the bridge foil used in a conventional exploding foil initiator system (EFIS).

Non-contact thickness measurement for ultra-thin metal foils with differential white light interferometry

A new differential white light interference technique for the thickness measurements of metal foil is presented. In this work, the differential white light system consists of two Michelson interferometers in tandem, and the measured reflective surfaces are the corresponding surfaces of metal foil. Therefore, the measuring result is only relative to the thickness but not the position of metal foil. The method is non-contact and non-destructive, it has the advantages of high accuracy, fast detection, and compact structure. Theoretical analysis and preliminary experimental verifications have shown that the technique can be used to measure the thickness of foil in the range of 1 to 80 μm with accuracy better than 0.08 μm.

Evaluation of high-temperature tensile behavior for metal foils by a novel resistance heating assisted tensile testing system using samples with optimized structures

To evaluate the tensile behavior of metal foils by resistance heating(RH)assisted tensile testing system accurately,this study proposed to embed a digital image correlation(DIC)system with laser speckles for the measurement of full-field strain distribution.Furthermore,the sample structures were optimized to achieve uniform temperature and strain distribution.An infrared camera was used to monitor the temperature distribution.Rectangular samples instead of dog-bone shaped samples were proposed.A model for calculating the temperature distribution was established to optimize the sample structure.The parameters that influence the temperature distribution and tensile behavior were studied.As results,compared to the strain measured by a non-contact extensometer,the maximum deviation of the strain measured by DIC was less than 6%when the nominal strain was larger than 0.013.It is confirmed that the proposed tensile testing system is reliable for measuring the temperature and full-field strain distributions.Sample shape influenced temperature distributions of smaller samples while it almost had no influence on the temperature distributions of larger samples.The temperature difference was not affected by the material type but by the sample size.The proposed rectangular shape was validated to be feasible for RH assisted tensile testing.The sample length was successfully optimized for a more uniform temperature distribution by the established model.Although the tensile deformation was not influenced by the sample shape,the temperature distribution resulted in a non-uniform strain distribution before achieving ultimate tensile strength.Longer effective sample length between two clamping jigs contributed to a more uniform temperature distribution and material deformation.A more accurate evaluation of high-temperature tensile behavior for metal foils can be achieved by the proposed RH assisted tensile testing system using rectangular samples with an optimized structure.

Feasibility evaluation of failure models for predicting forming limit of metal foils

Forming limit of metal foil is an important index to evaluate its formability,and is of considerable significance to improve the quality of products.The ductile fracture(DF)behavior in microscale plastic deformation is remarkably affected by the geometry and grain size.To explore the size-dependent forming limit curve(FLC),the Holmberg and Marciniak tests of SUS304 foils with the thicknesses of less than 0.1 mm and diverse grain sizes were performed.In addition,the validity and feasibility of three types of existing failure models including Swift/Hill,MarciniakKuczynski(M-K)and DF criteria for predicting the micro-scaled FLCs were discussed.It is found that the Swift/Hill model possesses the worst accuracy with predicting deviation above 50%.Four classical DF criteria including Freudenthal,Ayada,Brozzo and Oh show great difference,and Oh model considering plastic anisotropy presents the best precision.The predicted deviation of M-K model is aggravated with increasing grain size and decreasing foil thickness,which is attributed to the intensified free surface roughening and transformation of fracture mechanism with miniaturization.This research thus provides a deeper understanding and valuable reference for the widespread application of FLC in microforming.

Preparation and Characterization of Mesoporous Al-MCM-41 Layers Deposited on FeCrAl Metallic Foils by an In-situ Hydrothermal Method

A new class of activated mesoporous Al-MCM-41 layers was deposited on Fe-CrAl metallic foils in the presence of cationic surfactant cetyltrimethylammonium bromide under basic conditions by an in-situ hydrothermal method. The characterization techniques including X-ray diffraction, nitrogen adsorption and transmission electron microscopy, as well as field-emission scanning electron microscopy were performed to investigate the pore structure and surface morphology of the Al-MCM-41 layers. The Al-MCM-41 materials are of amorphous structure but exhibit large BET surface area （up to 757.0 m2/g） and pore volume （up to 0.72 cm3/g）, as well as a mean pore diameter of 3 nm. The layers deposited on the FeCrAl foils are continuous despite with a few of holes on the surface.

Cu对铝/钢CMT熔钎焊接头界面区组织的影响研究

采用冷金属过渡方法,以AlSi5焊丝为填充金属,在5052铝合金和镀锌钢板之间添加铜箔片进行搭接熔钎焊,使用扫描电子显微镜结合能谱分析和拉伸试验机对接头的界面区组织与性能进行研究。结果表明,未加入铜箔时,界面区组织主要由FeAl_(3)金属间化合物组成;铜箔的加入使得界面区组织中新生成了CuAl_(2)金属间化合物,同时改善了Zn在界面区的分布。Zn固溶于Al中,一定程度上抑制了Fe-Al金属间化合物产生。加入铜箔后的试样断裂位置发生改变,接头的承载能力与未加入铜箔的相近。

Effects of gravity on the electrodeposition and characterization of nickel foils

The effects of gravity on nickel electrodeposition,the morphology and mechanical properties of deposits were studied in a super gravity field.Predictions in a microgravity field were also presented based on the obtained experimental tendency.Linear sweep voltammetry reveals that the nickel electrodeposition process is enhanced by increasing the gravity coefficient（G）.The limiting current density changes from 10.2 to 293.0 mA·cm-2 with the increase of the G value from 10-4 to 354.The morphology of deposits was analyzed by scanning electron microscopy（SEM） and atomic force microscopy（AFM）.The images show that the morphology deposited in the super gravity field has finer grain sizes and denser and smoother surfaces.The roughness reduces from 48.3 to 4.9 nm with the increase of the G value from 10-4 to 354.Meanwhile,mechanical tests indicate that the mechanical properties of nickel foils are greatly improved due to introducing a super gravity field during electrodeposition.

欧标铝塑复合带屏蔽综合护套的生产工艺探讨

通过对比双面铝塑复合带和单面铝塑复合带的纵包工艺,对单面铝塑复合带的纵包工艺进行讨论,并对热熔胶的性能选型进行分析,解决了铝塑复合带生产过程中的质量问题,发现单面铝塑复合带不仅可用作综合防水护层,也可起到金属屏蔽的作用,从而降低电缆成本。

INTERFACIAL REACTION BEHAVIOUR AND JOINT STRENGTH OF TiC_p/Si_3N_4 COMPOSITE BONDED WITH Al FOIL

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有色金属板带箔边部板形控制及算法

针对宽幅有色金属板带箔材边部板形控制问题,提出一种有色金属板带箔边部板形控制方案及算法,能有效改善带材边部所在工作辊辊形,实现带材边部板形有效可控。

金属复合极薄带制备工艺研究进展

随着电子工业、微型机器人等相关产业向智能化、微型化发展,工业产品对金属复合材料厚度提出了更高要求,研发性能优良的金属复合极薄带具有重要意义。金属极薄带轧制过程受到最小可轧厚度的限制,这增加了异种金属复合极薄带的制备难度。目前,制备金属复合极薄带的主要方法有喷射沉积法、磁控溅射法、扩散焊接法和轧制复合法。喷射沉积法和磁控溅射法工艺复杂,成本较高,通过扩散焊接法得到的金属复合极薄带结合强度较低,难以大规模生产。轧制复合法可分为“先复合后减薄”和“先减薄后复合”组合工艺。“先复合后减薄”组合工艺在较为成熟的异种金属中厚板轧制复合技术基础上进行后续减薄过程,但此工艺复杂,成本较高;“先减薄后复合”组合工艺直接采用极薄带材作为原料,复合工艺较简单,但对设备要求较高。本文归纳了金属复合极薄带的制备方法,重点评析了轧制复合组合工艺在金属复合极薄带材制备的应用,综述了金属复合极薄带材制备过程方面的研究新进展,并预测了金属复合极薄带材制备工艺研究的发展方向。

金属极薄带在锂离子电池中的应用与研究进展

为响应节能减排号召,新能源成为能源发展的主要研究方向,而锂离子电池作为新能源的一种,被广泛研究和应用。金属极薄带材是锂离子电池中的关键性材料,也是锂离子电池集流体的主要载体材料,将其他活性物质涂敷于金属极薄带上,可作为负极或正极。高品质金属极薄带可以更好地提高锂离子电池的充放电效率,使锂离子电池的性能得到提升。本文综述了铜箔、铝箔、镍箔、不锈钢箔以及表面处理铜箔、铝箔复合集流体在锂离子电池中的研究进展,重点分析了极薄带材的厚度、表面处理及力学性能等对锂离子电池的影响,指出超薄、超延展、高强度的高性能金属极薄带在锂离子电池中的未来发展方向。

X光弯晶成像金属薄膜面密度测量技术

针对靶用高Z金属薄膜的无损检测需求,提出了一种通过超环面弯晶聚焦型X光单能成像器件,实现金属薄膜均匀性及面密度等参数精确标定的测量技术。该技术即通过高通量、高单能性成像,定量获取薄膜X光透过率及其空间分布,有效提升了面密度测量的精度,同时实现了对其均匀性的高空间分辨评估。从总体方案设计、元器件制备和测试实验等方面开展了深入研究,并评估了各种可能因素对测量不确定度的影响。所发展的超环面弯晶成像系统针对20 keV级的高能X射线在mm尺度内实现了优于5μm的微区分辨,能谱分辨达到几eV。通过泡沫金样品面密度测量实验证明了技术可行性,相对不确定度优于2%。研究结果为激光惯性约束聚变高Z靶材料的精密无损检测提供了一种新的测量技术,并有望应用于其他需要大视场、高空谱分辨成像的需求领域。

高阻隔非金属柔性复合管承压性能模拟

在复合管结构的基础上添加了阻隔层,并基于有限元模拟建立了高阻隔非金属柔性复合管三维模型,分析了复合管阻隔层几何及工艺参数对承压性能的影响,确定了阻隔层最佳参数。结果表明,高阻隔非金属柔性复合管承压时,芳纶增强层应力最大,其次为铝箔阻隔层,内衬层和外保护层应力最低;铝箔阻隔层厚度对复合管承压性能影响最大,其次为摩擦因数的影响,铝箔层宽度和缠绕角度的影响最低;综合考虑管道应力和设计成本,确定铝箔阻隔层最佳厚度为0.15 mm,最佳宽度为200 mm,最佳缠绕角度为70(°)。

酸酐分子结构对金属箔电阻器环氧粘接剂材料热力学性能影响的研究

为获得金属箔电阻器用高热稳定性环氧粘接剂材料,采用分子模拟计算结合实验的方法研究了甲基六氢苯酐(MeHHPA)、甲基四氢苯酐(MeTHPA)和六氢苯酐(HHPA)的分子结构对金属箔电阻器环氧粘接剂材料热力学性能的影响。首先分别建立了3种酸酐分子与芴基环氧树脂(DGEBF)的交联模型,并通过分子模拟计算分析了交联模型的宏观热力学参数,其次从微观参数方面解释了酸酐分子结构对交联体系热力学性能影响的机理,最后通过实验对仿真结果进行了验证。结果表明:六氢邻苯二甲酸酐体系具有最小的自由体积和均方位移,自由体积占比仅为15.15%。实验中,3种酸酐固化体系的热力学性能变化趋势与模拟计算结果相吻合,六氢苯酐体系的热力学性能最好,其玻璃化转变温度达435 K,弯曲强度达84.46 MPa,体积热膨胀系数仅为1.65×10^(-4)K^(-1)。

铝箔纸替代金属环进行建筑密封材料质量损失率测试的可行性探讨

分别参照国标GB/T 13477.19—2017《建筑密封材料试验方法第19部分:质量与体积变化的测定》规定的金属环法和企业简易铝箔纸法对市场上40种建筑用硅酮耐候密封胶进行质量损失率测试,对两种方法试验结果进行了比对分析,探讨两种测试方法间数据的关联性以及铝箔纸法替代金属环法的可行性。

锂电池用3D多孔铜箔研究进展

电解铜箔作为负极集流体是锂电池的重要组成部分,决定了锂电池的内阻,并影响电池的循环寿命以及稳定性。随着对锂电池能量密度和循环寿命要求的提高,对电解铜箔的相关性能如比表面积、微观形貌等要求也越来越高。3D多孔铜箔因其不同形式的多孔结构,较现有的平面铜箔具有更大的比表面积,可以有效提升锂离子电池的稳定性和循环寿命。推进3D多孔铜箔的商业化应用已经成为现阶段锂离子电池负极材料研究的主要方向之一。本文综述了不同形式的多孔铜集流体制备的工艺以及其相关性能测试,通过总结表明多孔铜负极集流体对提升锂离子电池性能具有重要意义。本文旨在为铜箔生产与研发人员提供参考。

一种新型可调压金属箔材压辊装置的设计与应用

本研究旨在解决金属箔材在生产制造过程中压辊压力调整困难、压力均匀性不稳定等问题。通过设计一种新型的金属箔材压辊装置,实现了对压辊压力和压力均匀性的精确控制。该装置包括可调整压力的压辊和控制系统。控制系统根据预设的参数和实时数据,自动调整压辊的压力,以实现所需生产的金属箔材的厚度和材质。通过使用这种新装置,我们能够解决传统装置中调整困难和不稳定性的问题,该装置可提高生产效率和产品质量。

金属箔卷智能制造工厂自动化物流系统设计

金属箔卷是重要的工业产品,提高其在生产中的各个环节间的智能、自动化转运,降低能耗,提高产品质量与管理水平是一项重要的研究课题。文中以实际项目为例,研究了项目具体需求,对智能工厂中金属箔卷类货物单元的自动化物流系统进行方案设计,以自动化立体库的方式解决该类货物自动化存储和搬运的实现,得出采用自动化立体仓库等自动化物流系统的可行方案。

电解铜箔毛面色差质量问题的分析与改进

江铜铜箔公司在电解铜箔的生产过程中,由于毛面色差问题造成铜箔产品降级数量达到207 t,影响品级率为0.83%,针对该问题,对毛面色差问题的产生原因和改进措施进行了深入研究。分析查明,导致毛面色差的主要原因是清理喷头故障、喷淋杆固定支架位置设计不合理、淋连接软管易弯折影响水流、DI管道管壁滋生细菌,并对此采取相应整改措施。经改进后,箔面毛面色差降级率明显降低,由改造前的0.83%(2021年降级率)降至0.15%(2022年降级率),实现2022年全年减少色差原因降级117.1 t,取得了显著的经济效益。