| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 99 === In this thesis, effects of engine oils containing biodiesel and diesel on the performance are discussed. Wear test engine oils can be divided into two types. The first type oils through field test (using B1 or B5 asfuel). The second type is the mixture of diesel (D100) and biodiesel (B100, B50, B5) for different concentration. Wear tests are performed under ball-on-plate contact type under different test temperature conditions by Cameron-Plint TE77 reciprocating wear test rig. After wear tests, the morphology of wear specimens are observed by scanning electron microscopy (SEM). The compositions of the chemical films are identified using an energy dispersive spectrometer (EDS) and an auger electron spectroscopy / electron spectroscopy for chemical analysis (AES/ESCA).
Results show that in the same fuel dilution rate, whether at a low or high temperature, the anti-wear ability of engine oils with biodiesel is better than that of engine oils with diesel oil. At room temperature, engine oils with biodiesel have better physical adsorption capacity; at high temperature biodiesel tends to have catalytic effects with ZDDP additives. This phenomenon would help increase the growth rate of chemical films. However, concentration of the biodiesel should be controlled because engine oil with B100 causes tribochemical wear. Among three different concentration biodiesels, anti-wear ability of engine oil with B5 is higher.
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