Laser-assisted structuring of ceramic and steel surfaces for improving tribological properties
Laser-assisted structuring of ceramic and steel surfaces for improving tribological properties
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DOI：
10.1016/j.apsusc.2005.01.173
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发表时间：
2005-07
影响因子：
6.7
通讯作者：
S. Schreck;K. Gahr
中科院分区：
文献类型：
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作者：
S. Schreck;K. Gahr
系统的摩擦学性能对于节能和延长使用寿命具有重要意义。众所周知，磨损和摩擦行为受到配合表面形貌的强烈影响。在润滑滑动接触的情况下，可以通过产生以小通道或孤立凹坑形式的限定表面结构来改善摩擦学性能。取决于结构，它可以用作润滑剂的储存器并且阻碍润滑剂的排出。此外，可以从接触区域去除磨损颗粒，并且可以将其收集在结构内部。本文采用Nd：YAG激光器在陶瓷（Al_2O_3）和钢（100Cr_6）表面产生不同的结构。通过激光烧蚀工艺在原本平坦的表面上产生微通道和微坑。由于激光系统的高度灵活性，可以通过改变激光参数轻松改变尺寸、密度和方向等结构特征。使用圆柱/平板摩擦试验机进行润滑和反向滑动接触，研究了不同形貌对摩擦磨损行为的影响。激光结构化100Cr 6和氧化铝表面配合100Cr 6气缸表明，减少摩擦，可以实现相比，抛光表面。根据表面结构的种类，摩擦系数可以降低高达30%，特别是在摩擦学实验的初始阶段。结果表明，激光技术是优化摩擦学表面形貌的有效工具。
Tribological properties of a system are very important for saving energy or increasing service life as in automotive industry. It is known that wear and friction behaviour is strongly influenced by the topography of the mated surfaces. In case of lubricated sliding contact the tribological properties can be improved by generating a defined surface structure in form of small channels or isolated pits. Depending on the structure it may act as a reservoir for the lubricant and hampers the drain of the lubricant. In addition, wear particles can be removed from the contact area and can be collected inside the structures. In the present paper, a Nd:YAG-laser was used to generate different structures on ceramic (Al2O3) and steel (100Cr6) surfaces. Microchannels and micropits were generated onto an otherwise flat surface by a laser ablation process. Due to the high flexibility of the laser system, structural features such as size, density and orientation could be varied easily by changing the laser parameters. The effects of different topographies on friction and wear behaviour were examined using a cylinder/plate tribometer for lubricated and reversed sliding contact. Laser structured 100Cr6 and alumina surfaces mated to 100Cr6 cylinders showed that a reduction of friction could be achieved in comparison to the polished surfaces. Dependent on the kind of the surface structure the coefficient of friction could be reduced up to 30%, especially in the initial period of the tribological experiment. The results show that the laser technique is an effective tool to optimise the topography of tribological surfaces.