Study of the Lubrication State of Nano-porous Anodic Aluminum Oxide Template Based on Stribeck Curves
HU Ning-ning
GE Shi-rong
Abstract：For researching the effect of porous structure of anodic aluminum oxide template on its lubricating properties,the porous alumina membranes with pores of 40 nm and 90 nm diame-ter, and the alumina with smooth surfaces were prepared. The contact angle with water and engine oil of the three specimens were investigated by a contact angle analyzer. The lubricating states of a GCrl5 steel pin-disc plane contact pair were tested using an UMT-2 tester. The re-sults show that the surface of porous alumina membrane possesses better wettability than the smooth alumina, alumina with 90 nm pores owns super-oleophilic property of oil. Under the water or engine oil lubricant, when the speed is increased from 0. 016 m/s to 0.32 m/s, only boundary lubrication is founded for the smooth alumina, while the boundary lubrication, mixed lubrication and elastohydrodynamic lubrication are all found for the porous alumina. Under the engine oil lubricant, for the Stribeck curve of porous alumina with 40 nm pores, the critical speed to the lowest friction coefficient is 0.28 m/s and the lowest friction coefficient is 0. 083, while for 90 nm pores, with the critical speed to the lowest friction coefficient 0.2 m/s, and the lowest friction coefficient is decreased to 0.023. The Stribeck curve for porous alumina with 90 nm pores shows a broader frictional coefficient valley and mix lubrication zone.
Keywords：Stribeck curvecontact angleporous structurefriction coefficient
Publication Date：2009-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 851-855 )