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In this work, the distilled biodiesel of waste cooking acids methyl esters (WCME) was blended with petroleum diesel as testing fuels (D100/DB2/DB5/DB20/DB100). The tribological performance of the biodiesel was evaluated using a reciprocating cylinder-on-flat wear test rig (Cameron-Plint TE-77) at various temperatures (room temperature and 80℃). After the wear test, the worn surface of each tested specimen was observed using a scanning electron microscope (SEM). The compositions of the chemical films on each worn surface were determined using an energy dispersive spectrometer (EDS). The experimental results demonstrate that the tribological behavior of the DB100 was superior to that of the other testing fuels. Lubricity of the test sample was increased as a consequence of increasing biodiesel concentration, which caused by the quantity of the methyl esters in the test sample.

Evaluation of Biodiesel Tribological Performance under Reciprocating Sliding Conditions