Atomic oxygen erosion resistance of sol–gel oxide films on Kapton
Silica, alumina and silica-alumina composite films were deposited on Kapton substrate via sol–gel method and their atomic oxygen (AO) erosion resistance was test in a ground-based AO simulator. The surface morphology and the structure of as-deposited films were investigated by scanning electronic microscope, X-ray photoelectron spectroscopy, and Fourier transformed infrared spectroscopy. After AO exposure, more cracks and micro-pores appear on the surface of silica and alumina films, respectively. For the silica-alumina composite films, their toughness and densification are good, and the stable interface is formed between the alumina and silica phases. Therefore, the silica-alumina composite-coated Kapton shows the best AO resistance and the erosion yield is two orders of magnitude less than that of pristine Katpon. Moreover, the composite-coated Kapton remains optically stable under AO exposure.
KeywordsSol–gel Silica Alumina Atomic oxygen erosion Structure
This study was supported by the Hebei Education Department Project of China (QN20131015).
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