Investigation on sol–gel boehmite-AlOOH films on Kapton and their erosion resistance to atomic oxygen |
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Authors: | Xin Zhang Yiyong Wu Gang Liu Shiyu He Dezhuang Yang |
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Affiliation: | aSchool of Material Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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Abstract: | To improve the atomic oxygen (AO) erosion resistance of Kapton, boehmite-AlOOH films were deposited on it by sol–gel method and AO exposure experiments were performed in a ground-based AO simulator. The results indicate that the AlOOH-coated samples show an improved AO resistance and their erosion yield is one order of magnitude less than that of pristine Kapton. Furthermore, the AlOOH-coated Kapton remained optically stable under AO exposure. The AlOOH film structure before and after AO exposure was analyzed by scanning electronic microscope, atomic force microscopy, X-ray photoelectron spectroscopy and X-ray diffraction. It was found that after AO exposure, the film structure tends to transfer from an octahedral coordination for AlOOH to an octahedral and tetrahedral mixed-coordination for γ-Al2O3. This implies that a more stable γ-Al2O3 structure could be formed in AlOOH film during AO exposure. The AO erosion mechanism of the coated Kapton was discussed. |
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Keywords: | Bohemite Sol–gel Kapton Erosion X-ray photoelectron spectroscopy X-ray diffraction |
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