Abstract
The control of lubricant migration on the various surfaces in a spacecraft is necessary in order to ensure the continued reliability of the lubricated assemblies and to limit the contamination of critical components. For this reason, the mechanics and rates of migration of thin oil films on metal surfaces have been investigated. It has previously been demonstrated that small temperature gradients cause the rapid and complete migration of oil films toward the regions of lower temperature. More recent studies of the migration of oil in the presence of geometrical and chemical barriers are now discussed. The migration was induced by capillary forces, temperature gradients and gravity. It was established that smooth sharp edges are as effective as chemical agents in preventing oil migration. Rough edges do not exhibit this effect, however.
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