银在原子氧环境中的氧化行为

The Oxidation Behaviour of Polycrystalline Silver Films by Atomic Oxygen

摘要:

利用石英晶体微天平（QCM）、扫描电镜（SEM）和X射线衍射仪（XRD）对暴露在原子氧地面模拟装置中的银箔的表面氧化行为进行了研究.结果表明银在原子氧中的氧化分为两个阶段：在开始氧化过程中表面形成了一层较厚的Ag2O膜,由于氧化膜内较大的生长应力,使得氧化膜起皱、开裂和剥落;氧化过程的第二阶段为氧化膜顶层AgO的形成,AgO是由Ag2O和O反应生成的.

关键词:原子氧 银 氧化 空间环境

Abstract:

Silver foils irradiated by atomic oxygen (AO) generated in a ground simulation facility were investigated by quartz crystal microbalance (QCM), scanning electron microscopy (SEM) and X-ray Diffraction (XRD). The experimental results show that the oxidation behaviour of silver foil exposed to AO exhibits two stages: forming a thick Ag2O film at first, then forming AgO in the upper layer of the oxide film by the reaction of Ag2O film with O. At the first stage, the oxide layer cracked and spalled due to the development of stresses, so that new silver surface exposed out, and the further fast oxidation happened.

Key words:atomic oxygen; silver; oxidation; space environment