打底层对铝合金表面GLC镀层组织和摩擦学特性的影响  

EFFECT OF SUBLAYER ON THE STRUCTURES AND TRIBOLOGICAL PROPERTIES OF GLC COATING ON Al-BASED ALLOY

作　　者：时惠英[1] 龙艳妮[1] 蒋百灵[1] 陈迪春[1] 

机构地区：[1]西安理工大学材料科学与工程学院,西安710048

出　　处：《金属学报》2012年第8期983-988,共6页Acta Metallurgica Sinica

基　　金：国家重点基础研究发展计划资助项目2009CB724406~~

摘　　要：采用非平衡磁控溅射离子镀技术在铝合金表面分别制备了以Cr和Al为打底层,Cr-C和A1-Cr-C为过渡层的Cr/Cr C/类石墨碳(GLC)和Al/Al-Cr-C/GLC复合镀层,并与无打底层制备GLC镀层对比,系统研究了不同镀层微观结构、膜基结合力及摩擦学性能,结果表明,铝合金基体表面Cr打底层呈柱状晶生长,Cr/C过渡层无柱状晶特征,且随过渡层增厚,富Cr区域减少,实现了成分的梯度变化:A1打底层与铝合金基体间为一个整体,没有明显界面;Al Cr-C过渡层的成分也呈梯度变化;采用不同打底层和过渡层时.GLC层均为非晶态结构.较无打底层制备GLC镀层,Cr/Cr-C/GLC和Al/Al-Cr-C/GLC复合镀层与铝合金基底间的膜基结合力显著增强,以Al为打底层的复合镀层的失效临界载荷最大.磨损实验中,在不同载荷条件下2种复合镀层均具有低的摩擦系数.Graphite-like carbon （GLC） film is a kind of antifriction coating. Cr/Cr-C/GLC and A1/A1-Cr-C/GLC composite coatings were prepared by using an unbalanced magnetron sputtering system on Al-based alloy, where A1 and Cr layer are the sublayers, Cr-C and A1-Cr-C are the transition layers. As a comparation, the GLC coating without sublayer was also deposited on the substrate. The microstructure, binding force and tribological properties of as-deposited coatings were studied. The results show that the Cr sublayer shows a columnar growth structure, while the columnar grain is not found in the Cr-C transition layer which has a gradient composition distribution, There is a good combining interface between A1 sublayer and Al-based alloy substrate. A1-Cr-C transition layer has a gradient composition distribution also. GLC layers based on different sublayers and transition layers have amorphous structures. Compared with GLC coating without sublayer, the binding forces of Cr/Cr-C/GLC and A1/A1-Cr-C/GLC composite coatings are obviously higher, and the A1/A1- Cr-C/GLC composite coating has the maximum critical load. Under different loading conditions, the friction coeiicients of both Cr/Cr-C/GLC and A1/A1-Cr C/GLC composite coatings are low and similar to each other.

关 键 词：非平衡磁控溅射离子镀 GLC镀层 微观结构 结合力 摩擦学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]