Abstract: Anonaqueous sol-gel route is introduced to prepare polyamide-imide bonded MoS2/SiOx dry film lubricant, so as to improve the tribological performances of the lubricants which were used on the components of the spacecraft. The sol-gel process was started from tetraethoxysilane (TEOS) and KH-560 hydrolyzing in N,N-dimethylacetamide. After the solution mixing with polyamide-imide and MoS2, the paint of the dry film lubricant was sprayed onto the G95Cr18 substrate. The dry film lubricants were obtained by the curing of polyamide-imide and polycondensation of the sol-gel. The chemical composition of the dry film lubricants were studied by Fourier transform infrared spectroscopy. The thermal properties of the dry film lubricants were characterized by thermogravimetric analysis and differential scanning calorimetry. A vacuum ball-on-disk friction and wear tester was used to evaluate the tribological behavior. The wear tracks were characterized by scanning electron microscope. Results show that some of the epoxy groups in the silica gel have reacted with the PAI binder. The silica element in the dry film lubricants showed uniform distribution. The SiOx grafted with PAI during the film lubricants curing, which increases the compatibility of the two phases. The thermal stability and the glass transition temperature of the film lubricants increased with increasing SiOx content. The wear resistance property was evidently enhanced when the amount of SiOx reached to 2.0wt%. The friction coefficient and worn rate in vacuum decreased profiting from the rolling effect of the SiOx and high strength of the film lubricants when the SiOx was introduced into the film.
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2022, Vol. 36 
