Advanced protection against environmental degradation of silver mirror stacks for space application
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第5期
论文作者：Rajendra Kurapati Vincent Maurice Antoine Seyeux Lorena H.Klein Dimitri Mercier Philippe Marcus
摘 要：Protection of silver mirror stacks from environmental degradation before launching is crucial for space applications. Hereby, we report a comparative study of the advanced protection of silver mirror stacks for space telescopes provided by SiO2 and Al2O3 coatings in conditions of accelerated aging by sulfidation. The model silver stack samples were deposited by cathodic magnetron sputtering on a reference silica substrate for optical applications and a surface-pretreated Si C substrate. Accelerated aging was performed in dry and more severe wet conditions. Optical micrographic observations, surface and interface analysis by Time-of Flight Secondary Ion Mass Spectrometry（To F-SIMS） and reflectivity measurements were combined to comparatively study the effects of degradation. The results show a lower kinetics of degradation by accelerated aging of the stacks protected by the alumina coating in comparable test conditions.
Rajendra Kurapati1，Vincent Maurice1，Antoine Seyeux1，Lorena H.Klein1，Dimitri Mercier1，Philippe Marcus1
1. PSL Research University, CNRS-Chimie Paris Tech, Institut De Recherche De Chimie Paris, Physical Chemistry of Surfaces Group
摘 要：Protection of silver mirror stacks from environmental degradation before launching is crucial for space applications. Hereby, we report a comparative study of the advanced protection of silver mirror stacks for space telescopes provided by SiO2 and Al2O3 coatings in conditions of accelerated aging by sulfidation. The model silver stack samples were deposited by cathodic magnetron sputtering on a reference silica substrate for optical applications and a surface-pretreated Si C substrate. Accelerated aging was performed in dry and more severe wet conditions. Optical micrographic observations, surface and interface analysis by Time-of Flight Secondary Ion Mass Spectrometry（To F-SIMS） and reflectivity measurements were combined to comparatively study the effects of degradation. The results show a lower kinetics of degradation by accelerated aging of the stacks protected by the alumina coating in comparable test conditions.
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