Study on Tribological Properties of NiCrAlY-Ag@Ni-MoS2@Ni Plasma Sprayed Coatings Over a Wide Temperature Range
Using MoS2@Ni,Ag@Ni,and NiCrAlY as raw materials,NiCrAlY-MoS2@Ni and NiCrAlY-Ag@Ni-MoS2@Ni composite coatings with different contents of MoS2@Ni were prepared by plasma spraying.The effect of different MoS2@Ni content on the mechanical and tribological properties of composite coatings was investigated.The formation mechanism of MoS2 lubricating film during the friction process was explored,and the influence of the addition of Ag@Ni and MoS2@Ni on the tribological properties of composite coatings over a wide temperature range was discussed.Results show that compos-ite coatings exhibit a typical layered organizational structure and the distribution of various phases is uniform.The Vickers hardness of the composite coatings decreases slightly with the increase of the addition amount of MoS2@Ni.During the fric-tion process,MoS2 inside the composite coating is diffused to the surface of the composite coatings by the combined action of load and temperature,and then forms a MoS2 lubricating film.NiCrAlY-Ag@Ni-MoS2@Ni composite coatings have ex-cellent medium to low temperature tribological properties by the effect of MoS2 lubricating film.During the high-tempera-ture friction process,the high-temperature lubricating phases are formed on the surface of the composite coatings by the high-temperature frictional chemical reaction between Mo and Ag,which improve the high-temperature tribological proper-ties of NiCrAlY-Ag@Ni-MoS2@Ni coatings.
plasma sprayingcomposite coatingsolid lubricantwide temperature rangetribological properties
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