Tribological properties of Ni-based composite coatings with addition of Ag@Ni core-shell particles over multiple thermal cycles
In order to inhibit the diffusion of Ag,Ag@Ni core-shell structure particles were prepared by the electroless plating,and then the NiCrAlY-Mo-Ag@Ni coatings were prepared by atmospheric plasma spraying.The effects of core-shell structure design on the mechanical and tribological properties of the coatings over multiple thermal cycles were researched in detail.The results show that the core-shell structure design of Ag could enhance the interfacial bonding strength between Ag and NiCrAlY by the Ni-coated layer,and then improve the hardness of the coating obviously.The Ni-coated layer inhibits the diffusion and dissipation of Ag effectively in the friction process at high temperatures.The friction coefficient and wear rate of the NiCrAlY-Mo-Ag@Ni coating tested at 800 ℃ are only about 0.25 and 1×10-5 mm3/(N·m),respectively,which are obviously lower than those of the NiCrAlY-Mo-Ag coating.Meanwhile,the core-shell structure design of Ag endows the coating with excellent self-lubricating and wear resistance over multiple thermal cycles.
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