Abstract: In order to improve anti-friction and anti-wear performance of the titanium alloy in aerospace and aircraft area, dimple textures were prepared on TA2 titanium surface by means of laser surface texturing (LST). Then the texturing surface was nitrided by low temperature ion nitriding technology. Tribological behaviors of the texturing surfaces were investigated under lubrication with simulated lunar soil in dry sliding contact on an MS-T3000 friction and wear tester. The micro-morphologies and element content on the worn surfaces were analyzed by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), respectively. The result shows that surface nitriding treatment can greatly improve the anti-friciton and anti-wear properties of testured titanium surface by 47.1% and 79.3%, respectively. Dimple diameter and dimple density have great effect on the average friction coefficient on the untreated surface, and the influence of dimple diameter is greater. The texture parameters have no effect on the anti-wear properties. After nitriding, dimple density has greater effect on anti-friciton and anti-wear properties than dimple diameter and dimple depth.

Key words: titanium, laser surface texturing (LST), nitriding treatment, friction and wear behavior, lunar soil