Fretting wear of micro-arc oxidation coating prepared on Ti6Al4V alloy

来源期刊:中国有色金属学报(英文版)2010年第4期

论文作者:林修洲 朱旻昊 郑健峰 罗军 莫继良

文章页码:537 - 546

Key words:titanium alloy; micro-arc oxidation; friction and wear; fretting wear

Abstract:

Micro-arc oxidation (MAO) coating was prepared on Ti6Al4V alloy surface and its characterizations were detected by Vickers hardness tester, profilometer, scanning electric microscope (SEM), energy dispersive X-ray spectrometer (EDX) and X-ray diffractometer (XRD). Fretting wear behaviors of the coating and its substrate were comparatively tested without lubrication under varied displacement amplitudes (D) in a range of 3-40 μm, constant normal load (Fn) of 300 N and frequency of 5 Hz. The results showed that the MAO coating, presenting rough and porous surface and high hardness, mainly consisted of rutile and anatase TiO2 phases. Compared with the substrate, the MAO coating could shift the mixed fretting regime (MFR) and slip regime (SR) to a direction of smaller displacement amplitude. In the partial slip regime (PSR), lower friction coefficients and slight damage appeared due to the coordination of elastic deformation of contact zones. In the MFR, the friction coefficient of the coating was lower than that of the substrate as a result of the prevention of plastic deformation by the hard ceramic surface. With the increase of the displacement amplitude, the degradation of the MAO coating and the substrate increased extremely. The fretting wear mechanisms of the coating were abrasive wear and delamination with some material transfer of specimen. In addition, the coating presented a better property for alleviating fretting wear.

基金信息:the National Natural Science Foundation of China
the National Basic Research Program of China
the Foundation of the Author of National Excellent Doctoral Dissertation of China

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