共查询到17条相似文献,搜索用时 93 毫秒
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高体积效率、超薄型化是实现钽电容器进一步小型化的有效技术途径,基于丝网印刷技术,提出了一种新的钽阳极制作方法,即首先将高比容钽粉制成浆料,然后印刷在钽箔上进行高温烧结作为电容器的阳极片,接着利用传统的阳极氧化方法生成五氧化二钽(Ta2O5)作为电容器的电介质,并通过多次浸渍硝酸锰、高温热分解循环被覆二氧化锰(MnO2)作为阴极材料,该方法制备的电容器其钽芯厚度最薄可以达到 0.2mm,体积效率相比传统技术提高了30%,而且经过 125℃、2000h寿命测试,试 验样品各项电性能参数稳定,基于丝网印刷工艺技术制造钽浆阳极的方法将加速钽电容器小型化和薄型化的发展。 相似文献
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全密封固体钽电解电容器的正温电容量变化超过标准规定值已成为该类型产品不合格的主要原因。本文分析了影响全密封固体钽电解电容器正温电容量变化的众多因素,阐述了全密封固体钽电解电容器电性能参数与温度变化的关系,提出了改进全密封固体钽电解电容器正温电容量变化的途径。 相似文献
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<正> 一、引言 固体钽电解电容器无论是电气性能还是可靠性都较液体钽电容器为佳。但就目前来说,如何进一步改善和提高固体钽电解电容器的电性能及降低其成本,仍然是有待继续研究的课题。 固体钽电解电容器的生产工序繁多,产品的制成往往需要经过称粉、压制成型、真空烧结、赋能、被膜、浸石墨,喷金和装配 相似文献
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通过对钽电容器自愈机理的研究,针对传统老化方法不能彻底剔除电介质有缺陷的钽电容器的缺点,提出一种新的老化方法并对多种钽电容器进行老化实验。新方法可以有效识别并100%剔除电容器不良品,钽电容器生产率提高了50%,钽电容器失效率达到0.1%/(1 000 h),可靠性提高。经验证,这种新老化方法适用于固体电容器、片式钽电容器、聚合物钽电容器和液体钽电容器等多种元件的老化筛选。 相似文献
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Tantalum capacitor failure modes have been discussed both for the standard manganese dioxide cathode and the new conductive polymer (CP) type. For standard tantalum in the normal operation mode, an electrical breakdown can be stimulated by an increase of the electrical conductance in channel by an electrical pulse or voltage level. This leads to capacitor destruction followed by thermal breakdown. In the reverse mode, we have reported that thermal breakdown is initiated by an increase of the electrical conductance by Joule heating at a relatively low voltage level. Consequently, a feedback cycle consisting of temperature–conductivity–current–Joule heat–temperature, ending with electrical breakdown was created. Both of these breakdown modes possess a stochastic behavior and can be hardly localized in advance. CP capacitors have shown a slightly different current conductivity mechanism compared to standard tantalum capacitors. The breakdown of CP dielectrics is similar to avalanche and field emission breaks. It is an electromechanical collapse due to the attractive forces between electrodes, electrochemical deterioration, dendrite formation, and so on. However, some self-healing of the cathode film has been reported. This can be attributed to film evaporation, carbonizing or reoxidation. Not all of the breakdowns of CP capacitors can lead to self-healing or an open circuit state. Short circuits can also occur. 相似文献
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介绍了钽电解电容器的常见失效模式,结合我厂军品电源模块使用的CAK45钽电解电容器,进行了失效率估算,并对钽电解电容器使用中常见的失效模式提出了具体的预防对策,最后对钽电解电容器的加速寿命试验结果进行了分析。 相似文献