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消除航天器介质内带电所产生脉冲放电威胁的最佳方式,除有效屏蔽外,就是研制不会产生脉冲放电的介质材料和绝缘结构件.通过对航天器用聚酰亚胺、环氧树脂和聚四氟乙烯等几种典型聚合物的改性研究发现,采用微米级无机粉料对聚合物介质材料进行改性,只要添加剂的电导率显著低于聚合物的电导率,该复合介质材料即可产生显著的非线性电阻率特性,可以实现在介质内带电程度达到放电阈值时迅速以非脉冲电导电流方式释放掉所储存的危险电荷,有可能达到消除脉冲放电的目标;当该添加剂含有微量“施主”杂质时甚至还可以提高介质材料在正常情况下的电阻率.对复合介质非线性电阻特性的产生机理进行了分析.
The best way to eliminate the threat of impulse discharge caused by live charge in the spacecraft is to develop a dielectric material and an insulating structure that will not produce pulse discharge except for effective shielding.Through the study of spacecraft polyimide, epoxy resin and poly Tetrafluoroethylene and other several typical polymer modification study found that the use of micron inorganic powder polymer material modified, as long as the conductivity of the additive is significantly lower than the conductivity of the polymer, the composite dielectric material can be Which has the remarkable non-linear resistivity characteristic and can quickly release the stored dangerous charge in a non-pulsed current-carrying manner when the degree of charge in the medium reaches the discharge threshold, and it is possible to achieve the goal of eliminating the pulse discharge; when the additive contains trace amounts of impurities, The resistivity of the dielectric material under normal conditions can even be increased even when the donor impurity is applied.The generation mechanism of the nonlinear resistance characteristic of the composite dielectric is analyzed.