本文目的在於探討蓖麻油酯與生質柴油對引擎機油抗磨耗性能之影響。利用全新機油與不同濃度的蓖麻油酯及生質柴油做混合，並使用TE77往復磨耗試驗機進行滑動磨耗試驗以評估油品之磨潤性能。設計不同的試驗溫度、試驗週期等條件下進行磨耗試驗。此外，利用SEM、EDS、EPMA、AES與XPS等儀器用以分析表面磨耗型態、化合膜的化學組成，以及化合膜的生長行為。
試驗結果顯示，混合油在往復磨耗試驗中，無論是在室溫或是高溫試驗，含蓖麻油酯之機油其抗磨耗能力，均較含生質柴油的機油佳。室溫時，其抗磨耗能力由引擎機油中物理吸附膜與微液動壓效應的強弱所主導；而在高溫時，則由引擎機油中ZDDP添加劑的分解及反應速率所主導。此外，將磨耗試驗週期增加至六小時，含蓖麻油酯之機油磨耗量大幅上升，證明蓖麻油對於機油的抗磨耗能力衰退較為顯著，並在高溫試驗時產生膠狀物質，若添加至車輛中行駛恐會造成引擎的積污。

This study aims to investigate the effects of castor oil ester and biodiesel on the tribological performance of engine components. Wear test oil can be divided into two types. The first type is engine oil mixture of castor oil ester. The second type is the mixture of biodiesel for different concentration. Sliding tests are performed under different test temperature and operating hours conditions by Cameron-Plint TE77 reciprocating. In addition, use scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) and an auger electron spectroscopy / x-ray photoelectron spectroscopy (AES/XPS) separately to characterize the morphology of worn surface and indentify the composition of the surface films.
Results show that reciprocating wear tests of blending engine oil whether at a low or high temperature, the anti-wear ability of engine oils with castor oil ester is better than that of engine oils with biodiesel oil. At room temperature, the anti-wear ability of engine oil is dominated by the physical adsorption capacity and hydrodynamic effects; while at high temperature , the anti-wear ability of engine oil is depend on the moment of decomposition of ZDDP additives and their chemical reaction rate. In addition, the wear test period increases to six hours , we can find wear volume in the amount of engine oil blended with castor oil ester obviously increase, Castor oil ester for anti-wear capabilities more significant decline and produce a gelatinous substance at high temperature wear test, If add to a vehicle driving, it will lead to the problem of the engine deposition.

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