J. Mater. Sci. Technol. ›› 2021, Vol. 64: 1-9.DOI: 10.1016/j.jmst.2020.01.019

• Research Article •     Next Articles

Advanced protection against environmental degradation of silver mirror stacks for space application

Rajendra Kurapatia, Vincent Mauricea,*(), Antoine Seyeuxa, Lorena H. Kleina, Dimitri Merciera, Grégory Chauveaub, Catherine Grèzes-Bessetb, Loïc Berthodc, Philippe Marcusa   

  1. aPSL Research University, CNRS-Chimie ParisTech, Institut De Recherche De Chimie Paris, Physical Chemistry of Surfaces Group, 11 Rue Pierre Et Marie Curie, 75005 Paris, France
    bCILAS MARSEILLE, 600 Avenue De La Roche Fourcade, Pole ALPHA Sud - Saint Mitre, 13400 Aubagne, France
    cCNES, Sous- direction Assurance Qualite, Service Technologies, Materiaux Et Procedes, 18 Avenue Edouard Belin, 31401 Toulouse, France
  • Received:2019-07-22 Revised:2019-09-17 Accepted:2019-09-25 Published:2021-02-20 Online:2021-03-15
  • Contact: Vincent Maurice
  • About author:* E-mail address: vincent.maurice@chimieparistech.psl.eu ( V. Maurice).


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 SiC 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 (ToF-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.

Key words: Mirror layers, Protection, Layers, Silver, Atmospheric corrosion, Accelerated aging, Surface analysis, Space applications