钽、铌电解电容器工艺研究进展

结合对钽、铌电解电容器性性能特点的介绍，综述了近年来国内外钽、铌电解电容器研究、生产方面的进展以及市场动态。     

铌电容器及其性能

铌电解电容器性能比铝电解电容器好，价格比钽电解电容器低。本文综述了近年国外铌电容器的研究进展和将来可能的应用领域，并对其市场进行了分析。     

铌电解电容器最新研究发展动态

铌电解电容器性能比铝电解电容器好 ,价格比钽电解电容器低 ,在电解电容器领域大有发展前途。综述了近年来国内外电容器用高比容铌粉及铌电解电容器最新研究发展动态 ,并提出了作者的观点和建议     

铌电容器及其性能

铌电解电容器性能比铝电解电容器好 ,价格比钽电解电容器低。本文综述了近年国外铌电容器的研究进展和将来可能的应用领域 ,并对其市场进行了分析     

固体钽电解电容器研究发展趋势

从用导电聚合物微细贵金属粉替代传统电解质MnO2，用铌全部或部分取代钽，以及外形结构上采用小型片式化等三个方面论述了固体钽电解电容器的研究进展。     

镁还原法制备新型电解电容器阳极材料低价铌氧化物的工艺研究

对镁还原Nb2O5制备低价铌氧化物工艺进行了研究。采用研磨混料-还原焙烧-酸洗除杂-干燥工艺制备了低价铌氧化物粉末，采用XRD、SEM测试方法对产物物相、微观形貌进行了研究；按钽电解电容器相似的工艺将低价铌氧化物粉末制成了阳极，采用电解电容器阳极测试方法对其电性能进行了研究。结果表明，镁还原Nb2O5制备低价铌氧化物反应不易控制，产物物相复杂、粒度粗、粒形简单，以其为原料制做的阳极比容低、内阻高、漏电流大。     

铌还原法制备新型电解电容器阳极材料低价铌氧化物工艺研究

对铌还原Nb2O5制备低价铌氧化物工艺进行了研究。采用玛瑙研磨混料-还原焙烧-过筛工艺制备了低价铌氧化物粉末,用正交试验法及方差分析对工艺条件进行了优化,用XRD、SEM测试方法对产物物相、微观形貌进行了研究;按与钽电解电容器相似的工艺将低价铌氧化物粉末制成了阳极,并采用电解电容器阳极测试方法对其电性能进行了研究。结果表明,铌还原Nb2O5工艺制备的低价铌氧化物具有优良的电性能,比容达到69 500μF.V/g、损耗≤11.25%、漏电流(K值)≤1.8×10-4μA/(μF.V),其电性能指标优于FTa16—300电容器钽粉国家标准(GB/T 3136—1995)。     

新型片式电容器用高比容铌粉的特性

钽行业的价格波动，钽资源的减法，导致人们去寻找新的电容器材料，本文分析了铌电容器开发的优点，以为铌电容器是很有发展前途的电容器且是一种新的电容器品种；展示了宁夏开发的电容器级铌粉的性能，认为研究开发的铌粉适合铌电容器的制作。     

高能球磨法制备新型电解电容器阳极材料低价铌氧化物工艺研究

对在高能球磨中用Nb还原Nb2O5制备新型电解电容器阳极材料低价铌氧化物工艺进行了研究。研究对比了两种不同工艺方案:A,高能球磨混料-酸洗除杂-真空焙烧;B,高能球磨混料-真空焙烧-酸洗除杂。采用ICP、SEM分析检测方法对产物的杂质含量、微观形貌进行了分析研究。按与钽电解电容器相似的工艺将低价铌氧化物粉末制成了阳极,并采用电解电容器阳极测试方法对其电性能进行了研究。结果表明:A方案制备的产物比B方案的杂质含量低、漏电流小、比容低、损耗小,B方案产物比容可达107 000μF.V.g-1,两种方案制备的产物均有明显片式化现象、粒度细,但球磨过程中引入的杂质均难以在后续的洗涤过程中彻底除去,导致阳极漏电流较大。     

电容器工业中的粉末冶金技术

钽电解电容器是用钽粉压制成多孔的片状毛坯后烧结而成的。烧结块本身趄阳极作用。经阳极化处理后,烧结块中孔隙表面形成一层非常薄的(一般为500—5000(?))氧化膜电介质,然后往孔隙里渗渍电解液,即成阴极:也可以渗渍另外一种适当的溶液,     

Effect of cerium addition on microstructure and texture of aluminum foil for electrolytic capacitors

Anode foil of aluminum electrolytic capacitor,which requires large surface area for high capacitance,were prepared by rolling,annealing and electrochemical etching.Effects of cerium addition on the capacitance of aluminum electrolytic capacitors were investigated.Microstructure of the aluminum foil surface was observed by optical microscopy(OM) and scanning electron microscopy(SEM).Electron back scattered diffraction(EBSD) was also employed to reveal texture evolvement of cold-rolled aluminum foil after ann...     

国内外片式钽电容器的开发与发展

论述了国内外片式钽电容器的开发以及发展现状和趋势，简要阐述了片式钽电容器的应用。     

铝电解电容器用电极箔发展现状及市场预测

文章介绍了国内外铝电解电容器用电极箔的发展现状,预测了电极箔的市场需求和发展前景.同时,文章建议国内电极箔生产企业提高自主研发能力,突破高端电极箔技术壁垒,替代进口.     

电解电容器铝箔生产中杂质元素的控制

在电解电容器铝箔的生产中， 杂质元素的存在对铝箔性能产生综合影响， 最终降低电解电容器铝箔的比电容， 故需严格控制有害元素的含量。本文讨论了电解电容器铝箔中杂质成分的存在形式、杂质污染的原因以及防止污染的措施。     

TSC中晶闸管对和电容器的耐压研究

从理论上分析了TSC系统中晶闸管关断后电容器上残压和晶闸管对两端的电压，并据此提出了设备选型时需注意的问题。     

LaSr_2Mn_2O_7 Ruddlesden-Popper manganites for oxygen reduction and electrochemical capacitors

LaSr_2 Mn_2 O_7,a Ruddlesden-Popper type bilayered perovskite,was investigated as oxygen catalyst for oxygen reduction reaction(ORR) and active electrode material for electrochemical capacitors in KOH solutions.XPS results show that Mn takes a mixed Mn~(2+),Mn~(3+)and Mn~(4+)valence state with an average valence of 3.4.As catalyst towards ORR,LaSr_2 Mn_2 O_7 and LaSr_2 Mn_2 O_7/acetylene black composite favor four electron pathways for ORR.LaSr_2 Mn_2 O_7/C composite shows a comparable onset potential for ORR to that of Pt/C electrode.The improved ORR activity of LaSr_2 Mn_2 O_7/acetylene black composite is attributed to the synergy between catalytic LaSr_2 Mn_2 O_7 and conductive acetylene black.As electrode material for electrochemical capacitors,LaSr_2 Mn_2 O_7 exhibits a maximum specific capacitance of 167.2 F/g with 62%faradic contribution at a scan rate of 1 mV/s in cyclic voltammetry test.     

Activationless percolating transport of charge carriers in TbMnO3 films at low temperature with low electric field

Au/TbMnO3/YBa2 Cu3O7-x capacitors were fabricated on SrTiO3 substrates by pulse laser deposition technique, of which electric properties were investigated in the temperature range from 25 to 300 K. Both current-voltage characteristics and junction resistances with bias voltages showed remarkable temperature dependence, in which obvious thermally excited relaxation processes were found between 150 and 200 K. At the temperatures lower than the activation process, the leakage currents of the capacitors were studied. Interestingly, at high electric field, the mechanism of the leakage was Poole-Frenkel emission. However, at low electric field, the conduction was not Ohmic, and ideal lnJ∝E 1/4 characteristics were observed. Analysis showed that the possible origin was related to the inherent inhomogeneous nature of activationless percolating transport.