Abstract

To improve the tribological properties and suppress the friction-induced noise of Ti-6Al-4V alloys (TC4), TC4 with smooth surfaces (TSs), groove antifriction surfaces (GAs), Sn-Ag-Cu coating surfaces (SCs), and composite self-lubricating surfaces (CSs) with grooves and Sn-Ag-Cu coating were prepared. Experimental studies on the tribological properties and friction-induced noise were carried out. The results showed that TSs produced high-frequency scream for adhesive wear. GSs suppress the scream noise but induce low-frequency chattering. CSs with uniform profiles and smaller wrinkles showed tribochemical wear characteristics, which produced the various intermetallic compounds and oxides, improving the surface profiles and suppressing the microdefects. The synergistic effects of grooves and Sn-Ag-Cu coating on CSs reduce the high contact stresses of groove edges and suppressed the adhesive wear and friction-induced noise. The friction and noise reduction mechanisms of CSs are beneficial to obtain surfaces with the best antifriction performance and bearing capacity by improving the profiles.

摘要

为改善Ti-6Al-4V合金（TC4），具有光滑表面（TSs），沟槽减摩表面（GAs），Sn-Ag-Cu涂层表面（SCs）的TC4的摩擦学性能并抑制摩擦引起的噪声制备了具有沟槽和Sn-Ag-Cu涂层的复合自润滑表面（CSs）。进行了摩擦学特性和摩擦噪声的实验研究。结果表明，TSs产生了高频率的尖叫，以引起胶粘剂的磨损。GS抑制了尖叫声，但引起了低频震颤。具有均匀轮廓和较小皱纹的CS表现出摩擦化学磨损特性，产生了各种金属间化合物和氧化物，改善了表面轮廓并抑制了微缺陷。凹槽和Sn-Ag-Cu涂层对CS的协同作用降低了凹槽边缘的高接触应力，并抑制了粘合剂的磨损和摩擦引起的噪音。CS的摩擦和降噪机制有利于通过改善轮廓来获得具有最佳减摩性能和承载能力的表面。