MoS2-based dry film lubricants are widely used in aerospace mechanisms that have different contact geometries. Standard tribotests for dry film lubricants simplify real geometries as either point or line contact to facilitate comparison of different materials or operating and environmental conditions. However, it remains unclear whether the results of a tribotest with one contact geometry can be generalized to tests or mechanisms with different contact geometries. To assess the effect of contact geometry, we measured friction and wear of three MoS2-based dry film lubricants using reciprocating block-on-ring and pin-on-disk tests with the same initial Hertzian contact pressure and linear velocity. Friction and wear magnitudes, as well as some comparative trends between the dry film lubricants, differed for the two contact geometries. These findings encourage future studies to consider more than just point contact tribotests when evaluating MoS2-based dry film lubricants. Graphical Abstract
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