Dry Sliding Friction and Wear Behavior of Flame Sprayed Nickel-Based Composite Coatings

Nickel-based alloy coatings containing wear-resistant additives were prepared on the surface of nodular cast iron by flame spraying.The friction and wear behavior of the nodular cast iron substrate and the Ni-based coatings was examined with a pin-on-disk friction and wear tester.The morphology of worn surfaces was observed with a digital microscope,and the wear mechanism of the Ni-based coatings was discussed.Results indicated that,under heavy load condition,the nodular cast iron substrate was liable to severe wear,and the Ni-based coatings doped with wear-resistant additives showed good wear resistance.In the meantime,the wear mass loss of the Ni-based coatings under a load of 20~100 N significantly varied with varying type and dosage of the additives.Moreover,under dry sliding condition,the nodular cast iron substrate was mainly dominated by fatigue and adhesion wear,and the Ni-based coatings were dominated by fatigue wear,accompanied by a certain degree of plastic deformation.