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Experimental study on the tribological behaviour of CeO2‐diesel blends on the injector body

This paper aims to evaluate the impact of different qualities of nano‐cerium dioxide (CeO2) as the diesel additives on the friction and wear performance of the fuel injection system. Two different qualities of nano‐CeO2 were selected to prepare stably dispersed CeO2‐diesel blends. Their effects on the tribological behaviour of the injector body were studied on the RTEC friction tester. The results showed that the friction and wear properties of diesel blend with 10 ppm of CeO2 (whether CeO2‐1 or CeO2‐2) were all improved compared with pure diesel. With the increase of CeO2 addition (>10 ppm), the friction coefficient, wear width, and maximum wear depth of the wear scar increased. Compared with the blocky CeO2, adding spherical CeO2 into diesel had better friction and wear properties. Adding 10 ppm of CeO2 to diesel has no negative impact on the friction and wear performance of the injector body, especially the spherical CeO2.