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Vol.10, No.2, 147 ~ 157, 1972
Title
Fabrication and Evaluation of solid Electrolytic Tantalum capacitors
이동녕Dong Nyung Lee, 윤용구Young Ku Yoon
Abstract
Fabrication variables of tantalum solid electrolytic capacitors were studied in relation to their electrical properties. Emphasis was placed on investigating effects of sintering conditions on anodization rates and scintillation voltage, and effects of pyrolysis and aging conditions on electrical properties of tantalum capacitors. The dielectric oxide layer on the surface of sintered porous anode pellets was formed by anodizing in phosphoric acid solution. The solid electrolyte was applied on the dielectric oxide layer by impregnating the anodized pellets with manganese nitrate and then by its pyrolysis. The application of the solid electrolyte and reanodization at a reduced voltage were repeated several times. Vacuum sintering of tantalum pellets at a temperature above 2,000 ℃ was required to achieve the scintillation voltage above 250 volts. The increases in tanδ_f and in frequency dependence of capacitance of the dielectric oxide layer during Pyrolysis and aging process are attributed to increasing diffusion layer of the dielectric oxide layer.
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