双面银镀金互连材料原子氧防护性能分析

Evaluation of Atomic Oxygen Protection Performance of Double-sided Gold Silver Plated Interconnection Material

针对航天器太阳电池阵用互连片对耐原子氧侵蚀的需求,文章设计了一种双面银镀金互连片。对界面处银在金元素中的扩散深度以及原子氧对互连片侧面的侵蚀做了理论计算与原子氧试验微观分析。对互连片进行了总通量为7.83×10^(26)atoms/m^(2)(等效低轨15年)的原子氧侵蚀试验,并对互连片在试验前后的外观进行了观察对比,对试验后材料表面元素以及侧面侵蚀程度、材料强度等方面做了系统分析,对采用双面银镀金互连片制作的太阳电池组件进行了88000次温度循环试验,充分验证了互连片及焊点的空间环境适应性。研制的双面银镀金互连片成功应用于某低轨长寿命航天器太阳电池阵,大幅提升了太阳电池阵供配电稳定性。

Aim at the requirement for the interconnectors which can resistant to atomic oxygen corrosion in the spacecraft solar array,this paper designs the Au/Ag/Au interconnectors.By modeling calculation and microscopic analysis of the Atomic-Oxygen(AO)experiment,the diffusion of silver in the gold at the Ag/Au interface and the erosion of the side of the interconnector were determined.An AO erosion experiment with a total dose of 7.83×10^(26)atoms/m^(2)which equals to a lifetime of 15 years in low earth orbit is followed out to the interconnector.The appearance of the interconnector before and after the experiments with different AO doses is observed.The surface elements,the degree of lateral erosion,and the strength of the material are analyzed systematically.88000 temperature cycling experiments are carried out to the solar cell module that use the double-sided silver gold-plated interconnector,which fully verified the space environment adaptability of the interconnector as well as solder joint.The developed double-sided silver gold-plated interconnector has been successfully applied to the solar array of a low orbit long-life spacecraft,which greatly improves the stability of power supply and distribution of solar arrays.