Biodiesel or biodiesel–diesel fuel is the current fuel used to power transportation engines. Contamination on lubricating oil is a common issue due to leakage or extensive use of engines. This study explores the lubricant oil blend’s friction and wear with the biodiesel derived from waste cooking oil, waste cooking oil blend with oil, and biodiesel–diesel​ blend. The blending of biodiesels and biodiesel–diesel blend with lubricant oil varies from 5% to 25% of biodiesels and biodiesel–diesel with 95% to 75% of lubricating oil based on volume ratio. The test was conducted using a four-ball tribotester according to the ASTM D 4172. The result showed that blending of BWCIL75 with biodiesel–diesel has the lowest friction coefficient (0.072) among tested oil. The wear scar on the ball bearing lubricated with the blending mixture showed an acceptable diameter value. The wear morphology has shown that a worn surface with black spots provides more protection to the tested ball. The result found that fatty acid contained in the biodiesel and the low viscosity of biodiesel significantly reduced the frictional coefficient of the lubricating oil and worked as wear prevention. Mechanical efficiency of machinery component favour low coefficient of friction. This study indicated that biodiesel produced from waste cooking oil blended with oil shows better lubricity and can be used as an additive to petroleum-based lubricant for better automotive engine performance.

中文翻译：

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废弃地沟油生产生物柴油、地沟油与海藻复配及其柴油复配物对润滑油的摩擦学研究

生物柴油或生物柴油-柴油燃料是当前用于为运输发动机提供动力的燃料。由于泄漏或发动机的广泛使用，润滑油污染是一个常见问题。本研究探讨了润滑油混合物与源自废弃食用油的生物柴油、废弃食用油与油的混合物以及生物柴油-柴油混合物的摩擦和磨损。生物柴油和生物柴油-柴油混合物与润滑油的混合根据体积比为5%至25%的生物柴油和生物柴油-柴油与润滑油的95%至75%。该测试是根据 ASTM D 4172 使用四球摩擦测试仪进行的。结果表明，BWCIL75 与生物柴油-柴油的混合油在测试油中具有最低的摩擦系数 (0.072)。用混合混合物润滑的球轴承上的磨痕显示出可接受的直径值。磨损形态表明，带有黑点的磨损表面为测试球提供了更多保护。结果发现，生物柴油中含有的脂肪酸和生物柴油的低粘度显着降低了润滑油的摩擦系数，起到了防磨损的作用。机械部件的机械效率有利于低摩擦系数。这项研究表明，由废弃食用油与油混合生产的生物柴油表现出更好的润滑性，可以用作石油基润滑油的添加剂，以获得更好的汽车发动机性能。