Development Of The New Protection Coatings Against Atomic Oxygen In China
- Paper number
IAC-07-C2.6.04
- Author
Prof. Jingyu Tong, Beijing institute of satellite environment engineering, China
- Year
2007
- Abstract
Atomic oxygen (AO) in the low earth orbit (LEO) has shown to cause severe damage to organic-based materials on orbiting spacecrafts. By modifying the material surface, space-related polymer may maintain their durability and performance in LEO missions. The traditional protection method against AO is to deposit SiO2 film or Al2O3 film on substrate with PVD or CVD. Both films have good protection performance against AO, but these methods have two shortcoming: 1. It is very difficult to protect the large and complex surface of spacecrafts against AO with these methods. 2. The film may have pin-hole and crack defects because of process weakness or space environment damage. AO will result in the “undercutting” at the defects. It may make protection films peeling and failure of protection. To overcome above-mentioned problem, the development of new protection films against AO have been carried out and made large progress during last 5 years in China. This paper describes the evaluation results of two new protection coatings against space environment effects in ground-based test. The new protection method is organosilicon resin/ SiO2 hybrid coating produced with Sol-gal process. When the coating contains about 30The other method is a SiO2 film deposited on the substrate surface with ion implantation/deposition. There is not clear interface between SiO2 film and substrate surface. The coating has very good binding force and does not easy of flaking. When coating has some pin-hole and crack defects, AO will react on silicon ions under the defects and SiO2 can be produced. It can self-repair the defects and retard “undercutting” damage of substrate by AO. The radiation tests and temperature shock tests of these both coatings have been completed in our laboratory. The tests results reveal that these both coatings have good environment durability.
- Abstract document
- Manuscript document
IAC-07-C2.6.04.pdf (🔒 authorized access only).
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