Du Fengming, Li Chengdi, Mi Zetian, Shen Yan, Huang Ruoxuan, Han Xiaoguang, Dong Yong, Xu Jiujun
College of Marine Engineering, Dalian Maritime University, Dalian 116026, China.
Xinyu Key Laboratory of Materials Technology and Application for Intelligent Manufacturing, Xinyu University, Xinyu 338004, China.
Materials (Basel). 2019 Apr 18;12(8):1273. doi: 10.3390/ma12081273.
To enhance the anti-wear property of aluminum-silicon (Al-Si) alloy, three processing technologies-chemical etching, mechanical honing and laser finishing-were compared in terms of their effects on anti-wear performance. The treated Al-Si alloy cylinder liner samples were worn against a piston ring by a reciprocating sliding tribotester; the anti-wear performance was represented by the friction coefficient and wear loss; and the wear mechanism was determined by establishing stress contact models. The results showed that the best time for both the chemical etching and mechanical honing treatments was 2 min, and the optimal laser power was 1000 W for the laser finishing treatment. The three processing technologies could all remove the aluminum layer and make the silicon protrude on the surface to avoid the plastic flow of aluminum during the friction process. The laser finishing could not only protrude the silicon particle but also make its edge rounded and smooth, which decreased the stress concentration. Therefore, the Al-Si alloy cylinder liner treated with laser finishing had the best anti-wear performance.
为提高铝硅（Al-Si）合金的抗磨损性能，对化学蚀刻、机械珩磨和激光精整三种加工工艺在抗磨损性能方面的影响进行了比较。通过往复滑动摩擦磨损试验机使经过处理的Al-Si合金气缸套样品与活塞环发生磨损；抗磨损性能用摩擦系数和磨损量表示；通过建立应力接触模型确定磨损机制。结果表明，化学蚀刻和机械珩磨处理的最佳时间均为2分钟，激光精整处理的最佳激光功率为1000W。这三种加工工艺都能去除铝层，使硅在表面突出，避免摩擦过程中铝的塑性流动。激光精整不仅能使硅颗粒突出，还能使其边缘圆润光滑，降低应力集中。因此，经激光精整处理的Al-Si合金气缸套具有最佳的抗磨损性能。
