高冲击下引信用固态钽电容的参数变化

摘要

A series of experiments were carried out to explore the effects of high-g shock load on the electrical parameters (capacitance and leakage current) of the solid tantalum capacitor.The results show that the capacitance increases with the increase of the shock load and the leakage current increases exponentially with the rising shock load.After the shock load,the electrical parameters return to their initial values as demonstrated.The variations of the tantalum capacitors' electrical parameters were explained by a combination of three mechanisms:the shock-induced elastic deformation of the tantalum capacitor that leads to the capacitance's increase,the shock-induced micro-defects and shockinduced rise of the electron traps concentration that leads to the leakage currents' increase.%通过实验研究分析了高冲击载荷对固态钽电容器电容量、漏电流等电参数的影响.结果显示,钽电容电参数随着冲击载荷的升高,电容量增大,同时漏电流呈指数型升高.冲击过后,钽电容电参数可恢复至原来的量级.冲击载荷引起钽电容电参数变化的机理为:冲击引起的钽电容的弹性变形使电容量增大,冲击引起的介质层Ta2O5中的微裂缝以及冲击引发的介质层中陷阱浓度的增大使漏电流升高.