Perhydropolysilazane derived silica coating protecting Kapton from atomic oxygen attack

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• 作者：Longfei  ; Hu^b ; Meishuan  ; Li^a ;   ; ^{mshli@imr.ac.cn} ; Caihong  ; Xu^c ; Yongming  ; Luo^c
• 关键词：Perhydropolysilazane ; Kapton ; Atomic oxygen ; Sol&ndash ; gel ; Erosion yield
• 刊名：Thin Solid Films
• 出版年：2011
• 出版时间：30 November 2011
• 年：2011
• 卷：520
• 期：3
• 页码：1063-1068
• 全文大小：1172 K

文摘

By using surface sol¨Cgel method with perhydropolysilazane (PHPS) as a precursor, a silica coating was prepared on a Kapton substrate as an atomic oxygen (AO) protective coating. The AO exposure tests were conducted in a ground-based simulator. It is found that the erosion yield of Kapton decreases by about three orders of magnitude after the superficial application of the coating. After AO exposure, the surface of the coating is smooth and uniform, no surface shrinkage induced cracks or undercutting erosion are observed. This is because that during AO exposure the PHPS is oxidized directly to form SiO₂ without through intermediate reaction processes, the surface shrinkage and cracking tendency are prohibited. Meanwhile, this PHPS derived silica coating also presents self-healing effect due to the oxidation of free Si. Compared with other kinds of silica or organic polymer coatings, this PHPS derived silica coating exhibits a superior AO erosion resistance.