Abstract
Ag, Mo, and Ag–Mo were respectively implanted into GH4169 alloy substrates without heating via ion-beam-assisted bombardment technology (IBAB). In addition, the wear performance under low sliding speed and applied load were researched at room temperature (RT). A small amount silver molybdate phase could be detected on the surface of the co-implanted GH4169 alloy bombarded by a high-energy ion beam. The average friction coefficients under the steady wear state had almost no change at all. Compared with the un-implanted GH4169 alloys, the wear rate of the GH4169 alloys with co-implantation of Ag and Mo was reduced by 75%. A large amount of the silver molybdate phase could be generated due to the tribo-reaction on the worn surface during sliding. It benefits the formation of continuous oxide layers as lubrication and protected layers, leading to the change in the predominant wear mechanism from abrasion and adhesion wear to oxidation wear.
Highlights
In order to achieve a low-friction coefficient and wear rate for some harsh-condition applications, numerous works on the lubrication effects about the addition of solid lubricant phases to metal matrices, such as graphite, oxides, soft metals, MoS2, and fluoride, have been carried out [1,2,3,4,5,6,7]
Double metal oxides, including titanates, tungstates, molybdate, and vanadates, are effective high-temperature solid lubricants [8,9,10,11]. Among these double metal oxides, more attention has been paid to silver molybdate, which possesses a layer-like structure, because of its excellent lubrication performance, achieving low friction at high temperatures [2,9,10,11,12,13,14,15,16,17]
The wear rate from room temperature (RT) to 700 ◦ C is reduced by an order of magnitude, and the worn surface is covered by a continuous and smooth film at 700 ◦ C
Summary
In order to achieve a low-friction coefficient and wear rate for some harsh-condition applications, numerous works on the lubrication effects about the addition of solid lubricant phases to metal matrices, such as graphite, oxides, soft metals, MoS2 , and fluoride, have been carried out [1,2,3,4,5,6,7]. Chen [2] and Aouadi [13] studied adaptive NiCrAlY–Ag–Mo coatings and nanocomposite Mo2 N/MoS2 /Ag coatings, respectively Friction coefficients for both coatings can be lowered to 0.1 at 600 ◦ C due to the formation of silver molybdate on the worn surface during sliding. Due to the large enthalpy of formation (∆Hf = +57 kJ/mol), silver molybdate usually forms during sliding at high temperatures and works as an effective high-temperature solid lubricant. A silver molybdate phase formed via the co-implanted GH4169 alloy during the preparation process in our experiments, but only a small amount was produced, which may be related to the high surface atomic activity of the.
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