Multi-layer compound coating on cast iron piston ring by multi-arc and magnetron sputtering ion compound plating technique

The Ti–TiN multi-layer compound coating on a cast iron piston ring utilizing the authors’ improved ‘multi-arc and magnetron sputtering ion compound plating device’ has been investigated by measuring the total thickness, fractography morphology, phases, micro-Vickers hardness, critical load, internal stress and wear resistance. The experimental results show that a Ti–TiN multi-layer compound coating thicker than 4 μm can be obtained on a cast iron piston ring, and the wear resistant properties of the cast iron piston ring-cylinder pair of an internal-combustion engine can be appreciably improved utilizing this technique.