橡胶塞的老化和电容器寿命

铝电解电容器橡胶塞的质量是影响寿命的关键因素。根据电容器的工作特点,研究了对橡胶塞用橡胶的要求,指出橡胶塞的老化机理是热氧老化。对比了各种橡胶的结构和性能特点,对国内现有EPDM和IIR的105℃系列的橡胶塞进行了试验研究,指出开发长寿命橡胶塞应该注意的问题。     

开关电源用高压铝电解电容器长寿命技术的研究

为了延长开关电源用高压铝电解电容器的使用寿命,通过开发并使用硼酸系改性添加剂和24,30碳支链二元酸铵盐,合理选取电解液的溶剂、溶质和吸氢剂开发宽温高电导率的电解液。优选H110-530VF低比容阳极箔、F3K-3.0VF化成负极箔、WS285-60电解纸,100%树脂丁基橡胶等原材料,以及对含浸工艺、钉花工艺、组装封口等关键工艺改进,研制出105℃高温负荷寿命达10 000 h的开关电源用高压铝电解电容器。     

开关电源用高压铝电解电容器长寿命技术的研究

为了延长开关电源用高压铝电解电容器的使用寿命,通过开发并使用硼酸系改性添加剂和24,30碳支链二元酸铵盐,合理选取电解液的溶剂、溶质和吸氢剂开发宽温高电导率的电解液.优选H110-530VF低比容阳极箔、F3K-3.0VF化成负极箔、WS285-60电解纸,100％树脂丁基橡胶等原材料,以及对含浸工艺、钉花工艺、组装封口等关键工艺改进,研制出105℃高温负荷寿命达10 000 h的开关电源用高压铝电解电容器.     

前处理和侵蚀对阴极箔比容的影响

碱洗预处理和侵蚀条件对阴极铝箔比容有影响。随 Na OH浓度和 Na3PO4浓度的增大 ,侵蚀箔比容下降。碱洗的温度升高或者时间增加 ,侵蚀箔比容也下降。侵蚀溶液盐酸浓度为 0 .85 mol/ L 时侵蚀箔比容达到极大值。侵蚀液温度过低和过高 ,侵蚀箔比容都低。温度为 90℃时侵蚀比容较高。通过试验得出了较好的前处理和侵蚀条件。     

基于Kingview平台的化成箔时间电压自动测试仪

介绍一种通过Kingview控制直流恒流源,实现化成箔升压时间（Tr）、到达电压（Vt）自动测试的仪器方案,给出了系统构成、数据采集模块选型与配置、压控恒流源电路及主要程序代码。该测试仪最高输出电压可达1100V,电压检测误差小于0．3V,稳流精度优于±0．01mA,输出纹波电压有效值小于0．5V;可同时测试3片样品,自动获取Tr,Vt并显示升压曲线。经6年的实际应用证明,该仪器可为化成箔质量控制提供可靠数据,对降低次品率与报废率有重要意义,测试效率比现有行业标准推荐的测试方法提高6倍。     

低压铝电解电容器用腐蚀化成箔构效关系研究

本文利用SEM表征了低压铝电解电容器用高比容腐蚀箔的结构,采用立方孔模型建立了低压腐蚀化成箔的结构-性能关系,并通过压汞仪测试对所建模型进行验证。SEM结果表明,低压腐蚀箔呈现海绵状结构,蚀坑保持立方型孔洞。在实用情况下,对于22. 4 V化成电压,最适孔径为0. 20~0. 24μm,最大比容为(185. 3~227. 6)×10^-6F·cm^-2。压汞仪测试结果表明,建立的立方孔洞模型可以反映低压腐蚀箔结构特征。     

电子束抽运高重复率KrF激光系统

为了发展惯性约束聚变能驱动装置所需的技术，在日本电子技术实验室，建立了高重复率电子束抽运的KrF激光放大器，样机放大器的脉冲电源系统巳建成，以1Hz重复率产生-300KV、80ns的脉冲。用脉冲变压器、磁开关和水介质脉冲形成线代替通常的带有球隙开关的Marx发生器，得到高压电短脉冲，这个系统的关键技术这一是强制冷却方法和HIBACHI结构中的阳极箔增加了其寿命。设计采用辐射和传导作为主要冷却过程，并允许箔加温到高温。选择HAVAR和钼分别作承压箔和阳极箔，代替通常的钛箔。箔的最高温度通过数字计算表明本设计是可用的。     

低压化成铝箔箔脆原因及解决途径

适用于50~100 WV铝电解电容器的高比容低压化成铝箔的脆性(简称"箔脆")容易导致电容器的多方面严重质量问题。根据理论分析与实践经验思考,提出了箔脆问题的解决办法。通过改良深度腐蚀工艺与化成过程的液体馈电工艺条件,即通过减弱后期腐蚀强度和降低液体馈电温度,提高了铝箔的夹芯层厚度和均匀性,使耐折弯强度(折曲强度)明显提高,有效地解决了箔脆问题。     

后处理对铝电解电容器阳极箔比容的影响

采用硫酸-盐酸体系环保型铝电解电容器用阳极箔腐蚀工艺,硝酸溶液作后处理液,结合SEM分析,探讨了硝酸后处理在阳极箔表面的清洗机理,研究了直流电侵蚀后,硝酸后处理对阳极箔比容的影响。结果表明:在硝酸溶液温度为65℃、清洗时间为250 s的条件下,阳极箔比容随着硝酸质量浓度的增加而增加,当硝酸质量浓度增至35 g/L时,阳极箔比容达到最大值0.70×10–6 F/cm2。硝酸质量浓度继续增加,阳极箔比容逐渐减小。最佳后处理参数为:硝酸质量浓度为35 g/L,处理温度为65℃,清洗时间为250 s。     

铝电解电容器容量不稳定现象分析与控制

铝电解电容器的无容量主要是因为接触电阻大、裂箔、铆接不良、铆接花瓣小、正极箔表面箔灰厚及原箔腐蚀太深而造成.容量时有时无主要是铆偏、箔片断片、抽芯、铆花毛刺、导针毛刺、铝箔边缘毛刺、露箔等原因而造成.在生产过程中加强铆接、卷绕工序的质量控制,避免出现容量不稳定的现象.     

出口插头插座产品型式试验常见问题分析

总结近年来出口插头插座产品存型式试验过程中出现的质量问题,并结合相关的安全性能标准,阐明型式试验中常见的问题,分析了产生这些问题的原因,为企业的产品设计和生产过程提供指导。     

碗形塞加工误差双目视觉在线检测方法

碗形塞主要用于堵塞发动机工艺孔,其加工精度高,直径尺寸公差要求在微米数量级。目前对碗形塞的加工误差检测主要还是人工检测方式,人工检测精度低且不能满足现代化生产的在线检测要求,因此提出利用双目视觉实现碗形塞加工误差在线检测的方法,将碗形塞放在一个旋转机构上匀速旋转,利用两台平行方向放置的摄像机采集碗形塞直径端面的多组图像,通过所提出的端面杂质去除方法校正检测结果,再通过数据处理获得碗形塞直径和锥度的加工误差。搭建了基于双目视觉的碗形塞加工误差在线检测系统并进行在线测试,测试结果表明该方法能够满足碗形塞的测量要求并实现在线检测。     

Design and performance of single-mode plug-in type optical-fiberconnectors

A new system of compact single-mode plug-in-type optical-fiber connectors is developed for multiple optical connections between a printed board and a back panel. This new system consists of two types of plug-in connectors: one has two optical plugs/jacks with 64 electrical terminals, and the other has four optical plugs/jacks without electrical terminals. This system utilizes a novel alignment mechanism for plugs and jacks and a novel fiber-core adjustment technology. The performance of assembled plug-in optical-fiber connectors was measured and confirmed to have the following characteristics: insertion losses are less than 0.4 dB and return losses are larger than 28 dB; mechanical tests such as mating, vibration, and shock, and environment tests such as temperature cycling, thermal aging, and high humidity with temperature cycling reveal extremely stable characteristics; and transmission tests using 1.8-Gb/s pseudorandom pulse patterns show low error rates of less than 10^-11     

Electrochemical mechanism of layout-dependent corrosion of tungsten in contact plugs

The investigation elucidates electrochemical effect on tungsten (W) contact plugs and proposes front-end-of-the-line semiconductor manufacture processes that are responsible for corrosion involving source/drain implants, rapid thermal anneal (RTA) and nickel silicide (Ni_xSi_x). W-filled contacts are commonly used in submicron and even nanometer CMOS technology, and the integrity of W contact plugs becomes increasingly critical as transistors continue to shrink. Incomplete W plugs with a recess on the tops of the contacts were observed in N+/n-well locations following W chemical mechanical polishing (WCMP). This phenomenon arises from anodic corrosion since the under-layer P+/p-well and N+/n-well form a PN junction structure, which has built-in potential and promotes the movement of photo-generated electrons during WCMP. The mechanism of the electrochemical effect is elucidated, and a series of experiments indicates a thin Ni_xSi_x layer, a heavy dosage of source/drain implants and a high RTA temperature promote the formation of corrosion defects.     

Single-mode fibre connectors

A low-loss detachable connector has been fabricated for single-mode optical fibres. It consists of a pair of plugs accommodating fibres to be joined and a sleeve provided with ball-bearing arrays to align the plugs. The average connecting loss is reduced to as low as 0.5 dB, including fibre end reflection.     

Understanding movement data quality

Abstract

Understanding of data quality is essential for choosing suitable analysis methods and interpreting their results. Investigation of quality of movement data, due to their spatio-temporal nature, requires consideration from multiple perspectives at different scales. We review the key properties of movement data and, on their basis, create a typology of possible data quality problems and suggest approaches to identify these types of problems.     

插头插座国家标准的几点修改建议

该文提出了现行插头插座国家标准的6项修改建汉措施,每项建议措施均列出了修改原因分析、具体建议措施以及可行性分析,为进一步完善我国插头插座国家标准提供建议和思路。     

Optical fibre connectors using a fused and drawn multi-glass-rod arrangement

New demountable single-fibre and multifibre connectors have been constructed whose plugs include a precision multi-glass-rod arrangement, made by drawing, for locating the fibres and aligning pairs of plugs. The single-fibre and 6-fibre connectors exhibit an average insertion loss of 0.2 dB with index matching and an average off-axis of 3.5 ?m. The connectors are potentially cost-effective and reliable.     

Low-loss optical-fibre connection systems

A new principle for preparing inexpensive high-accuracy plugs in the field using a precise reference-shape fixture is described. These plugs can be used to make optical-connection systems such as fibre-to-fibre connectors, distribution frames and multifibre connections with losses between 0.1 and 0.5 dB.     

常见英式插头测试误区的解析

英国法律规定,在市场中销售的插头必须是通过认证.由于英式插头的独特性,完全满足BS1363-1标准要求是相当困难.本文就常见问题进行重点分析.