Impacts of Bore Surface Finish and Coating Treatment on Tribological Characteristics of Engine Cylinder Bores



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Authors Abstract
The impacts of cylinder bore surface finish and coating treatment on the tribological characteristics of engine components were determined by using a modified Cameron-Plint Friction and Wear Tester. The friction and wear behavior of several honed cylinder bores was compared using plateau-honed and brush-honed bores in a normal, lubricated sliding wear mode. Several experimental thermal sprayed aluminum bores, prepared following a water jet cleaning process, were compared to production cast iron plateau-honed bores. For the cast iron bores, it was observed that most of the wear occurred within the first 2 hours of the run-in stage. In general, the combination of a cast iron bore sliding against molybdenum sprayed piston rings showed lower friction and wear compared to the thermal spayed aluminum bore samples sliding against the same rings. The rough-honed bore samples demonstrated much higher wear than the plateau-honed or brush-honed bores. After initial break-in, the wear rate slowed down and asymptotically approached a constant value.
Wear mechanisms for cast iron bores include progressive oxidation, micro-attrition, and micro-abrasion. Wear modes for thermal sprayed aluminum bores are dominated by oxidation, abrasive wear, and splat delamination. A wear model using an organic-iron compound and oxide metal mixture was found to be useful in explaining the effects of surface treatments, additive interaction, surface finish, and tribological characteristics.
Meta TagsDetails
Tung, S., and Emley, J., "Impacts of Bore Surface Finish and Coating Treatment on Tribological Characteristics of Engine Cylinder Bores," SAE Technical Paper 2002-01-1638, 2002,
Additional Details
May 6, 2002
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Technical Paper