The tribological properties of a gradient layer prepared by plasma-based ion implantation on 2024 aluminum alloy
The tribological properties of a gradient layer prepared by plasma-based ion implantation on 2024 aluminum alloy
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DOI：
10.1016/j.surfcoat.2003.10.003
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发表时间：
2004-05-24
影响因子：
5.4
通讯作者：
Xue, QJ
中科院分区：
文献类型：
--
作者：
Liao, JX;Xia, LF;Xue, QJ
DLC薄膜对铝合金的摩擦学性能起着重要的作用。采用等离子体离子注入法在2024铝合金上先注入N，再注入Ti，再注入N和Ti，最后注入C，制备了AlN/Ti/TiN/DLC梯度层。重点讨论了梯度层的摩擦学性能。利用x射线光电子能谱（XPS）表征了其成分、深度轮廓和化学结构，利用激光拉曼光谱分析了表面c层和磨损痕迹。采用原子力显微镜（AFM）观察了c层的形貌，用力学性能微探头测量了梯度层的硬度，并利用球盘式磨损试验机对AISI钢球进行了不同滑动载荷下的干磨损试验。结果表明，由于梯度结构的存在，梯度层的硬度逐渐变化，表面形貌致密，具有良好的摩擦学性能。随着滑动循环次数或载荷的增加，DLC薄膜的摩擦学性能会因石墨化而下降。同时，可以通过PBII工艺参数控制梯度层，从而获得优化的梯度层，为特定工程应用的铝合金和其他软合金的合格候选材料提供可能。(C) 2003 Elsevier B.V.版权所有
DLC films can play an important role in tribological properties of Al-alloys. A gradient layer of AlN/Ti/TiN/DLC film has been prepared by plasma-based ion implanted N, followed by Ti, and N and Ti, and finally C on 2024 Al-alloy. Emphasis has been placed on the tribological properties of the gradient layer. Its composition depth profile and chemical structure were characterized using X-ray photoelectron spectroscopy (XPS), the surface C-layer and the wear tracks were analyzed by laser Raman spectroscopy. The morphologies of the C-layer were observed by atomic force microscopy (AFM), the hardness of the gradient layer was measured with the mechanical property microprobe and the dry wear tests against AISI steel ball at different sliding loads were performed with a ball-on-disk wear tester in ambient environment. The results indicate that the gradient layer shows a gradual change in hardness, compact surface appearance and good tribological properties owing to the gradient structure. As the number of the sliding cycles or the load is increasing, the tribological properties decrease due to the graphitization of the DLC films. Meanwhile, the gradient layer can be controlled by PBII processing parameters, thus an optimized gradient layer can be obtained to offer the possibility of making aluminum alloys and other soft alloys qualified candidates for particular engineering applications. (C) 2003 Elsevier B.V. All rights reserved.