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A shaft with a low oil-wettable surface was found to show lower friction than one with a highly oil-wettable surface when used in oil-impregnated sintered bearings. Both the highly wettable shaft and the low wettable shaft were made of hardened stainless steel, with the latter also being coated with PTFE transfer film. A projector was used to observe bearing clearances where a large amount of oil droplets was observed on the low wettable shaft as compared to the highly wettable shaft. This suggested an oil-rich environment in the sliding area, resulting in low friction of the low wettable shaft. The large stability of droplets on the low wettable surface—stemming from a large contact-angle hysteresis between the oil and the low wettable surface—is probably responsible for the abundance of oil droplets in the bearing clearance for the low wettable shaft.

Effects of Shaft Surface Wettability on the Friction of Oil-Impregnated Sintered Bearings -Effect of Contact Angle Hysteresis-