✦ LIBER ✦

Degradation of carbon-based materials due to impact of high-energy atomic oxygen

✍ Scribed by Koji Fujimoto; Tadashi Shioya; Katsuhiko Satoh

Publisher: Elsevier Science
Year: 2003
Tongue: English
Weight: 737 KB
Volume: 28
Category: Article
ISSN: 0734-743X
DOI: 10.1016/s0734-743x(02)00057-x

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✦ Synopsis

Spacecraft structures in low earth orbit encounter a degradation problem caused by the impact of atomic oxygen (AO) in the space environment. This paper presents an experiment of impact degradation on the ground. The experiment was carried out in a vacuum space chamber. AO produced at a plasma torch was accelerated fluid-dynamically with argon (Ar) working gas. As the target materials, several carbon-based materials were employed; i.e., graphite, carbon fiber/carbon composite (C/C composite) and silicon impregnated C/C composite (Si-C.C.). The degradation was analyzed in the aspect of macroscopic mass loss per unit area and the microscopic degradation modes. The temperature effect and the exposure time effect are investigated and the comparison among the target materials is developed. The mass loss per unit area is approximately proportional to the exposure time and depends on the temperature of material surface. The eroded surfaces of materials were observed with a scanning electron microscope and an electron probe micro-analyzer.

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