Tribological Mechanism of Friction and Wear Reduction Using Oil-Based ZnO Nanofluid Applied on Brass

  • Chuanlin Tao Automotive Tribology Center, School of Engineering and Computer, Oakland University, Rochester, MI, USA School of Mechanical Engineering Qingdao Technology University, Huangdao Campus, Qingdao
  • Bingxu Wang Automotive Tribology Center, School of Engineering and Computer, Oakland University, Rochester, MI, USA School of Mechanical Engineering Qingdao Technology University, Huangdao Campus, Qingdao
  • Gary C. Barber Automotive Tribology Center, School of Engineering and Computer, Oakland University, Rochester, MI, USA School of Mechanical Engineering Qingdao Technology University, Huangdao Campus, Qingdao
  • J. David Schall Automotive Tribology Center, School of Engineering and Computer, Oakland University, Rochester, MI, USA School of Mechanical Engineering Qingdao Technology University, Huangdao Campus, Qingdao
  • Qian Zou Automotive Tribology Center, School of Engineering and Computer, Oakland University, Rochester, MI, USA School of Mechanical Engineering Qingdao Technology University, Huangdao Campus, Qingdao
  • Jing Wang Automotive Tribology Center, School of Engineering and Computer, Oakland University, Rochester, MI, USA School of Mechanical Engineering Qingdao Technology University, Huangdao Campus, Qingdao

Abstract

In this research, friction and wear characteristics of oil-based ZnO nanofluid applied on brass disk specimens using a flat-on-flat reciprocating sliding test were studied. Oleic acid was used as surfactant to improve the stability and dispersibility of the ZnO nanofluid. Metallurgical optical microscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy were utilized to understand the mechanisms. A 2wt% ZnO nanofluid resulted in 61.1% reduction in coefficient of friction. Good wear resistance was achieved using low concentrations of 0.5wt% and 1wt% ZnO nanofluid. A tribo-film mainly composed of carbon was found inside the wear track, which enhanced the wear resistance and lowered the interface shear strength. This tribo-film was produced by oleic acid which was chemically adsorbed to the brass materials.

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Published
2019-01-31
How to Cite
Tao, C., Wang, B., Barber, G. C., Schall, J. D., Zou, Q., & Wang, J. (2019). Tribological Mechanism of Friction and Wear Reduction Using Oil-Based ZnO Nanofluid Applied on Brass. European Scientific Journal, ESJ, 15(3), 223. https://doi.org/10.19044/esj.2019.v15n3p223