Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Preparation and Characterization of Lubricating Oil-based Nanofluids Containing Carbon Nanoparticles

탄소 나노소재를 이용한 윤활유 기반 나노유체의 제조 및 평가

  • Choi, Cheol (Advanced Materials Research Group, Strategic Technology Laboratory, KEPRI) ;
  • Jung, Mi-Hee (Advanced Materials Research Group, Strategic Technology Laboratory, KEPRI) ;
  • Oh, Jae-Myung (Advanced Materials Research Group, Strategic Technology Laboratory, KEPRI)
  • 최철 (한국전력 전력연구원 전략기술연구소 전력소재그룹) ;
  • 정미희 (한국전력 전력연구원 전략기술연구소 전력소재그룹) ;
  • 오제명 (한국전력 전력연구원 전략기술연구소 전력소재그룹)
  • Published : 2009.03.27
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Abstract

Lubricant-based nanofluids were prepared by dispersing carbon nanoparticles in gear oil. In this study, the effects of the particle size, shape and dispersity of the particles on the tribological properties of nanofluids were investigated. Dispersion experiments were conducted with a high-speed bead mill and an ultrasonic homogenizer, and the surfaces of the nanoparticles were simultaneously modified with several dispersants. The effective thermal conductivity of the nanofluids was measured by the transient hot-wire method, and the tribological behaviors of the nanofluids were also investigated with a disk-on-disk tribo-tester. The results of this study clearly showed that the combination of the nanoparticles, the deagglomeration process, the dispersant and the dispersion solvent is very important for the dispersity and tribological properties of nanofluids. Lubricant-based nanofluids showed relatively low thermal conductivity enhancement, but they were highly effective in decreasing the frictional heat that was generated. For nanofluids containing 0.1vol.% graphite particles in an oil lubricant, The friction coefficient in the boundary and fluid lubrication range was reduced to approximately 70% of the original value of pure lubricant.

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