固钽电容在甚高温条件下参数变化机理

Parameters Variation Mechanism of Solid Electrolytic Tantalum Capacitors in Very High Temperatures

选择烧结型固体钽电解电容器为研究对象,利用高于常规高温实验的温度,对固钽电容主要特性参数——容值、损耗因子、漏电流进行测试,获得25℃~205℃宽范围参数化曲线,并研究了甚高温条件下样本的参数变化机理和参数之间的相互关系.实验结果表明,电介质的化学反应和内部接触电阻变化,是导致损耗因子在甚高温条件下波动的主要原因.

Sintering of solid tantalum electrolytic capacitors are selected to test the main parameters of the characteristics—capacity,dissipation factor,leakage current,within the wide range of 25 ℃～205 ℃ parameters variation.Then parameters change mechanism and relationship were studied,and it was pointed out that chemical reactions of dielectric and changes of internal contact resistance are the main reasons for fluctuations of dissipation factor in the very high temperature conditions.