Investigation of ultra-low friction between self-mated Si3N4 in water after running-in

The aim of this work was to determine the mechanism of ultra-low friction between a self-mated Si3N4 pair lubricated with water after running-in. The key to solving this problem was to determine the lubrication regime of the interface under ultra-low friction conditions. According to the Stribeck cu...

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Bibliographic Details
Published in:Tribology international 2017-11, Vol.115, p.365-369
Main Authors: Guo, Fei, Wang, Zixi, Liu, Ying, Wang, Yuming, Tian, Yu
Format: Article
Language:English
Subjects:
Coefficient of friction
Friction
Hydrodynamic effect
Lubricants & lubrication
Lubricating oils
Self-mated Si3N4
Silicon nitride
Tribology
Ultra-low friction
Viscosity
Water
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Summary:The aim of this work was to determine the mechanism of ultra-low friction between a self-mated Si3N4 pair lubricated with water after running-in. The key to solving this problem was to determine the lubrication regime of the interface under ultra-low friction conditions. According to the Stribeck curve, the variations of friction coefficient with load and velocity were measured to evaluate the hydrodynamic effect; and the variation under different lubricating oils was examined to investigate the influence of viscosity and eliminate the influence of any tribochemical reaction between Si3N4 and water. Surface wear after a long-duration friction test under ultra-low friction conditions was also evaluated. It was found that the ultra-low friction mechanism was attributed to a pure hydrodynamic effect. •Effect of hydrodynamic on ultra-low friction coefficient between a self- mated Si3N4 pair in water has been investigated.•Surface wear has been measured after a long-duration test under ultra-low friction conditions.•The mechanism of ultralow friction is determined, attributing to a pure hydrodynamic effect.•A two-step running-in method is presented to rapidly achieve ultralow friction.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2017.06.006