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.


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    Title :

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


    Additional title:

    Sae Technical Papers


    Contributors:
    Emley, John (author) / Tung, Simon (author)

    Conference:

    Spring Fuels & Lubricants Meeting & Exhibition ; 2002



    Publication date :

    2002-05-06




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English






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