Friction and wear behavior of Al-Si alloy cylinder liner prepared by surface shaping treatments

In order to improve the friction and wear behavior of Al-Si alloy cylinder liner, the surfaces of cylinder liner samples were prepared by three kinds of surface shaping treatments (chemical etching shaping, mechanical honing shaping, and laser ablation shaping). All the three kinds of surface shaping treatments can expose the silicon particles on the surface of Al-Si alloy cylinder liner, which prevents the contact aluminum from the counterface (piston ring). The area between the two protruding silicon particles can be stored for enhanced lubrication and reduce friction. These shaping surfaces were different. The edges of the silicon particles are made sharp by the chemical etching shaping treatment. The edges of the silicon particles are round but with burr by the mechanical honing shaping treatment. The edges of silicon particles are round but without burr by the laser ablation shaping treatment. The friction coefficient and weight loss are lowest by the laser ablation shaping in three kinds of surface shaping treatments. There are two reasons. On the one hand, the edges of silicon particles are round but without burr, which reduce the stress concentration. On the other hand, the silicon particles combine well with aluminum, which reduce the probability of falling off.