Friction and Wear Testing of Ion Beam Modified Ceramics for High Temperature Low Heat Rejection Diesel Engines

TL;DRAbstract

This paper describes an experimental program that investigated the friction and wear behavior of ceramic materials considered for use for piston rings and cylinder liners in high-temperature, low-heat rejection diesel engines. Candidate materials include silicon carbide, silicon nitride, titanium carbide, nickel-molybdenum bonded titanium carbide cermets, and partially stabilized zirconia (PSZ); and ceramics whose surfaces have been modified by the ion beam mixing of several oxide-forming metal ions including chromium, cobalt, nickel, and a double layer of nickel and titanium. Friction and wear testing is performed in two stages. Various material couples are tested using laboratory bench tests (pin-on-disk) in simulated diesel environments at 800°C, in order to determine those couples most likely to be successfully applied to actual engine operating conditions. Cylinder liners and piston rings are produced from those materials, and tested under actual operating conditions in one of two

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