Study on the precursor for atomic oxygen resistant coating

Computer Science – Performance

Scientific paper

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Space Environment, Materials, Atomic Oxygen, Precursor, Coating, Sol-Gel, Organic-Inorganic Hybrids

Scientific paper

A coating of atomic oxygen resistant was obtained through sol-gel method, and the precursors for the coating were synthesized and analyzed. The precursor liquid was prepared using methacryloxypropyltrimethoxysilane (MAPTMS) and tetraethylorthosilicate (TEOS). In order to get a stable and clear liquid, different procedures of synthesis, different stirring time, different synthesis temperature, water amount, and other additives were considered. IR spectra and experiments of DSC of different precursor liquids were compared, and the effect of Si-O and O-H groups was discussed. The results demonstrated that the amount of TEOS additions has greater effects on the bond strength. It is agreed with greater Si-O ratio in a single molecule TEOS than in silane. SEM experiment gives that they also possess the good performance on the atomic oxygen (AO) exposed resistant. The SEM pictures showed almost no change between the coatings with and without AO exposure. Necessary heat treat time for the precursor depends on the silane to silica sol ratio, and the heat treatment temperature, heat-treatment time.

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