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暴露在低地球轨道(LEO)上的太阳电池阵,会与大量具有极强氧化性的原子氧发生碰撞,导致太阳电池阵中对氧原子敏感的Ag互连材料受到剥蚀。文章依据原子氧剥蚀Ag材料的机理,选取了约400 km高度轨道上1年时间内原子氧的累积通量作为最高剂量,进行了原子氧剥蚀不同厚度Ag互连材料的地面模拟环境试验。试验表明:Ag在原子氧作用下在宏观上会经历“氧化—剥落”的循环剥蚀过程。根据反应方程简化推导了Ag互连片的剥蚀厚度公式,同时结合试验结果计算出了不同厚度Ag互连材料的厚度损失率。该研究成果可为LEO太阳电池阵原子氧防护设计提供技术支持。
Solar cells exposed to low earth orbit (LEO) collide with a large number of highly oxygenated atomic oxygen, resulting in the erosion of oxygen-sensitive Ag interconnects in the solar array. In this paper, based on the mechanism of atomic oxygen destructive Ag material, the cumulative flux of atomic oxygen in one year over a distance of about 400 km was selected as the highest dose, and ground simulated environmental tests of different thicknesses of Ag interconnects by atomic oxygen oxidation were performed. Experiments show that: Ag under the action of atomic oxygen macroscopically will experience “oxidation - spalling” cycle erosion process. According to the reaction equation, the formula of denudation thickness of Ag interconnecting sheet is deduced. At the same time, the thickness loss rate of Ag interconnecting material with different thickness is calculated. The research results provide technical support for LEO solar array atomic oxygen protection design.