氮及钛等离子体基离子注入铝合金表面改性层的摩擦磨损性能研究

研究了铝合金LY12等离子体基氮及钛离子注入层的摩擦磨损性能。用X射线光电子能谱和小掠射角X射线衍射对改性层中各元素分布及相组成进行了分析。用扫描电子显微镜对注入层形貌进行了观察和分析。结果表明：注入层由TiN、α-Ti、AlN、Al2O3和TiO2等相组成；注入后试样硬度提高了1倍以上；在低载荷下，摩擦系数处于0．10－0．14之间，注入层寿命提高了12倍以上，耐磨性提高了100倍以上；随着滑动载中增加，摩擦系数有所增大，而磨性有所降低；在注入层被磨穿以前以剥层磨损为主并伴有轻微的划伤，在注入层被磨穿以后以粘着磨损为主并伴有犁沟和粘着转移。注入改性层具有适当的梯度结构是提高铝事金表面硬度和耐磨性的主要原因。

Friction and Wear Behavior of the Modified Layer of Aluminum Alloy Implanted with Nitrogen and Titanium by Plasma Source Ion Implantation

The friction and wear behavior of the modified l ayer of aluminum alloy LY12 implanted with nitrogen and titanium by plasma sourc e ion implantation (PSII) has been investigated. The depth profile of the elemen ts in the modified layer was analyzed by means of X-ray photoelectron spectrosc opy (XPS) and the phase compositions determined by means of glancing angle X-ra y diffraction (GXRD). The morphologies of the wear tracks were observed with a s canning electron microscope (SEM). The results show that the modified layer cons ists of TiN, α-Ti, AlN, Al2O3, and TiO2. Compared with the unmodifie d LY12 sample, the mechanical properties were improved greatly, the coefficient of friction decreased considerably, and the antiwear life increased dramatically after ion implantation. The main wear mechanism of the modified sample is mild adhesion wear, while wear of the Al alloy substrate is characterized by severe a dhesion and scuffing. The great improvement in the mechanical properties and wea r resistance of Al alloy after ion implantation with Ti+ and N+ is mainly at tributed to the formation of proper graded structure in the modified layer.