期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 35, 期 12, 页码 2957-2965出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2019.08.011
关键词
Carbon/Carbon; CVD SiC coating; Low earth orbit; Atomic oxygen; Exposure; Stress
资金
- National Natural Science Foundation of China [51632007, 51672218, 51821091]
- National Key R&D Program of China [2017YFB1103500]
In this work, samples of carbon/carbon (C/C) and chemical vapor deposited (CVD) SiC-coated C/C samples were investigated to understand the AO damage mechanism in low Earth orbit (LEO) environment. The ground-based simulated atomic oxygen (AO) generator was employed. Results indicate that the CVD SiC coating exhibited improved radiation resistance properties against AO radiation as evidenced by a 16% better strength retention ratio, 60% less mass ablation, and increased strength stability. The magnitude of these influences affected the surface morphology, as observed by scanning electron microscopy (SEM) and surface resistance meter test results. The variations in the surface constituents were confirmed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) results. The main products left on surface after AO exposure are SiO2 and SiCxOy film. Additionally, Si atoms are found to be the preferential reacting element in the SiC coating, and this process is accompanied by graphite precipitation, grain growth, and crack necking. Also, the damage mechanism of the AO-exposed SiC coating was revealed and is discussed. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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