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- W4362677067 abstract "Fretting wear during launch operation is a well-known cause of anomalies in spacecraft. In this study, a CubSat satellite stayed stuck in its dispenser during the final preflight qualification test. So close to launch date, not a single part of the satellite could be replaced. A fretting test campaign has been carried out at tribometer scale to propose a solution to lubricate the damaged contacts. In depth expertise of the satellite allowed to determine the contact parameters. Damages and particles observed on the rail surfaces were successfully reproduced. The tests showed the appearance of a continuous flow of loose particles that either leave the contact or agglomerate inside it. Those agglomerating induced high friction and high adhesion. After contact opening and cleaning off the particles, lubrication was applied on the resulting damaged surfaces. Sprayed alkyl-phosphonic acid molecules and grease containing PTFE were selected to be tested as lubricant because they could be applied manually. PTFE accumulated in the damaged regions, protecting the surfaces from further damage while ensuring good lubrication. Sprayed alkyl-phosphonic acid molecules performed less. They however demonstrated in-situ tribochemical formation of a suspected graphene-oxide based lubricious 3rd body. Grease has been eventually chosen and the satellite successfully launched." @default.
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- W4362677067 date "2023-07-01" @default.
- W4362677067 modified "2023-09-26" @default.
- W4362677067 title "Fretting wear_lubrication of initially worn parts through tribo-induced anchorage of PTFE in wear scars, and tribochemical creation of graphene oxide" @default.
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- W4362677067 doi "https://doi.org/10.1016/j.wear.2023.204882" @default.
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