Search Results

Piston rings are used to seal the cavity formed between the piston and the cylinder in order to allow the engine to operate efficiently. The piston rings wear out due to constant rubbing action with cylinder wall and also have to withstand high temperature. This has lead to the development of new piston ring coatings with good wear properties under increasingly challenging running conditions. To improve the wear resistance of the piston rings several coating techniques are employed. One such technique is Ni-P composite coating which is widely used in the automotive industry. Reinforcement of ceramic particles enhances the tribological and mechanical properties of the coating. The base material of the piston ring used in this study is hardened carbon steel. The main objective is to develop an optimum Ni-P composite coating on piston ring to improve wear and friction resistance.

Piston rings are used to seal the cavity formed between the piston and cylinder in order to allow the engine to operate efficiently. The Piston rings wear out due to constant rubbing action with cylinder wall and also have to withstand very high temperature. The top compression ring is the closest to combustion gases and is exposed to the greatest amount of chemical corrosion and highest operating temperature. This has lead to development of new coatings to piston ring with good wear and corrosion resistance. One such coating is Nickel Phosphorus (Ni-P) and Nickel Phosphorus composite coating (Ni-P SiC) used in automotive industry. Reinforcement of ceramic particle not only enhances the tribological property but also the corrosion resistance behavior. The electroplated Ni-P & Ni-P metal matrix with ultra-fine SiC particles of 0.6 microns to a coating thickness of 30 microns minimum.