中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 34 No. 2 February 2024 |
（1. College of Mechanical and Electrical Engineering, Shaanxi University of Science &Technology, Xi’an 710021, China;
2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China）
Abstract: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 °C 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.
Key words: core-shell structure; Ag@Ni; Ni-based composite coating; tribological properties; multiple thermal cycles
