Analysis demonstrates reduced power loss and wear behavior in spur gears with CrAlN+Mo:W:S coatings under dry lubrication.
<pc:p>Cylindrical gears are coated with CrAlN+Mo:W:S using High Power Pulsed Magnetron Sputtering and direct current Magnetron Sputtering. Their power loss, bulk temperature, and wear behavior are analyzed on the FZG gear efficiency test rig under dry lubrication. Coated and uncoated gears are examined using laser microscopy, energy-dispersive spectroscopy, and Raman spectroscopy. For operating points with low gear power loss, a tribofilm containing MoS2 as well as Mo and W oxides is detected on the pinion and wheel tooth flank, resulting in a stable tribosystem for several thousands load cycles. Cylindrical gear pairs with CrAlN+Mo:W:S coated wheels exhibit reduced power loss and lower bulk temperatures compared to uncoated gears.</pc:p>
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Farrenkopf et al. (2025) studied this question.
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