Abstract
TiO2-12wt% Al2O3 coating was deposited on engine cylinder surface by internal plasma spraying to optimize the cylinder-piston tribosystem. The tribological tests were conducted under lubricated conditions on SRV4® reciprocating tribometer. To simulate engine acceleration from cruise to full power, friction parameters of load, frequency and temperature were designated to change over a wide variation, namely 53–157N, 35–45Hz and 85–197.5°C respectively. Accordingly, triboscopic 4D-maps were plotted originally to exhibit the evolution of friction coefficient. Results also showed that cylinders after coating had significant improvement of tribological properties compared with the uncoated specimens, which can be attributed to the great chemical stability to oil, smooth surface roughness during friction, high hardness and H/E of the ceramic coating.
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