| Summary: | 碩士 === 國立臺北科技大學 === 製造科技研究所 === 102 === This study aimed to improve the lubrication performance of lubricating oil by adding Bi and Bi/Cu nanoparticles into mineral oil SAE-30. This study carried out tribological test using a pin-on-disk tester that meets ASTM G99 standards. Focusing on Bi and Bi/Cu nanolubricants at different concentrations, this study analyzed the tribological features of the nanolubricants with additive of Bi and Bi/Cu nanoparticles, and then acquired Stribeck curves of three lubrication regions. Besides, this study tested the worn surface of sample, including appraisal of its ingredients and appearance of worn surface. The differences of fiction coefficient, wear scar diameter, morphology of worn surface and viscosity was analyzed. Experimental results show that adding Bi or Bi/Cu nanoparticles into lubricating oil can enhance wear resistance and reduce friction coefficient. Under the condition of Bi nanoparticles at concentration 0.1 wt%, the friction coefficient and wear scar diameter can be reduced by 68.9 % and 38.6 % respectively comparing to pure lubricating oil. In addition, under the condition of Bi/Cu nanoparticles at concentration 0.2 wt%Bi+0.08 wt%Cu, the friction coefficient and wear scar diameter can be reduced by 71 % and 50.95 % respectively comparing to pure lubricating oil. Furthermore, after load is applied, experimental results show that the lubricant added with Bi nanoparticles can effectively enhance the oil’s ability in wear resistance. Besides, through SEM photographs, it is proved that Bi and Cu nanoparticles produce filling and sedimentary effects on the worn surface.
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