Abstract
With the purpose of achieving ultra-lubricated surface on Ti6Al4V alloy, porous TiO2 layer, ultra-high molecular weight polyethylene (UHMWPE) film and hydrophilic 3-dimethyl(3-(N-methacrylamido)propyl)ammonium propane sulfonate (DMMPPS) polymer brushes were sequentially fabricated to form a composite coating. The change of surface morphology was investigated by Scanning Electron Microscope (SEM) during the preparation of composite coating. The composition and structure of modified surface were characterized by Energy Dispersive Spectrometry (EDS), X-ray Diffraction (XRD) and Fourier-transform Infrared Spectroscopy with Attenuated Total Reflection (FTIR/ATR). The surface wettability was also studied to evaluate the hydrophilicity. Friction and wear properties of modified alloys sliding against stainless steel were preliminarily tested by a ball-on-disc tribometer in physiological saline. The results revealed that the composite coating with well hydrophilicity on Ti6Al4V alloy was successfully prepared. The modified surface presented an ultra-low friction coefficient at 0.02, and simultaneously indicated favorable wear resistance. This newly developed composite coating possessed potential to improve the tribological properties of Ti6Al4V alloy.
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