J Mater Sci Technol ›› 2009, Vol. 25 ›› Issue (04): 483-488.

• Articles • Previous Articles     Next Articles

Effects of Vacuum Ultraviolet Radiation on Atomic Oxygen Erosion of Polysiloxane/SiO2 Hybrid Coatings

Longfei Hu1,2), Meishuan Li1)†, Yanchun Zhou1)   

  1. 1) Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
    2) Graduate School of Chinese Academy of Sciences, Beijing 100039, China
  • Received:2008-05-16 Revised:2008-10-15 Online:2009-07-28 Published:2009-10-10
  • Contact: Meishuan LI

Abstract:

Polysiloxane/SiO2 hybrid coatings have been prepared on Kapton films by a sol-gel process. The erosion resistance of polysiloxane/SiO2 (20 wt pct) coating was evaluated by exposure tests of vacuum ultraviolet radiation (VUV) and atomic oxygen beam (AO) in a ground-based simulation facility. The experimental results indicate that this coating exhibits better AO resistance than pure polysiloxane coating. The erosion yield (Ey) of the polysiloxane/SiO2 (20 wt pct) hybrid coating is about 10¡27 cm3/atom, being one or two orders of magnitude lower than that of polysiloxane. VUV radiation can affect the erosion process greatly. Under simultaneous AO and VUV exposure, the value of Ey of the polysiloxane/SiO2 (20 wt pct) hybrid coating increases by 39% compared with that under single AO exposure.

Key words: Atomic oxygen, Vacuum ultraviolet radiation, Erosion yield, Hybrid coating