期刊
SURFACE AND INTERFACE ANALYSIS
卷 45, 期 8, 页码 1283-1290出版社
WILEY
DOI: 10.1002/sia.5269
关键词
diamond-like carbon films; PAO oil lubrication; nano boron nitride additive; superlubricity; transfer films
资金
- National Natural Science Foundation of China [51175406, 51275381]
- China Postdoctoral Science Foundation [2012M511993]
- Chinese Ministry of Education [20120201120040]
The tribological properties of Si3N4 ball sliding against diamond-like carbon (DLC) films were investigated using a ball-on-disc tribometer under dry friction and oil lubrications, respectively. The influence of nano boron nitride particle as lubricant additive in poly--olefin (PAO) oil on the tribological properties of Si3N4/DLC films was evaluated. The microstructure of DLC films was measured by Raman spectroscopy and X-ray photoelectron spectroscopy. The experimental results show coefficient of friction (COF) of Si3N4/DLC films was as low as 0.035 due to the formation of graphite-like transfer films under dry friction condition. It also indicates that the tribological properties of Si3N4/DLC films were influenced significantly by the viscosity of oil and the content of nano boron nitride particle in PAO oil. COF increases with the viscosity of PAO oil increasing. Si3N4/DLC films exhibit the superlubricity behaviors (=0.001 and nonmeasurable wear) under PAO 6 oil with 1.0 wt% nano boron nitride particle lubrication, indicating that the improved boundary lubrication behaviors have indeed been responsible for the significantly reduced friction. Nano boron nitride additive is used as solid lubricant-like nano scale ball bearing to the pointlike contact and a soft phase bond with the weak van der Waals interaction force on the contact surface to improve the lubrication behaviors of Si3N4/DLC films. The potential usefulness of nano boron nitride as lubricant additive in PAO oil for Si3N4/DLC films has been demonstrated under oil lubrication conditions. The present work will extend the wide application of nano particle additive and introduce a new approach to superlubricity under boundary lubrication in future technological areas. Copyright (c) 2013 John Wiley & Sons, Ltd.
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