The study of the tribological properties of TiAgN/W2N coatings in a wide temperature range. (3rd May 2019)

• Record Type: Journal Article
• Authors: Duan, Jiahao; Ye, Fuxing; Zhao, Hongjian
• Is Part Of: Materials research express. Volume 6:Number 8(2019)
• Publication Date: 2019-05-03
• Subjects: TiAgN/W2N coatings -- magnetron sputtering -- wide temperature -- hardness -- wear; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/ab15ef
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: TiAgN/W2 N nanoscale multilayered coatings with modulation periods (Λ) ranging from 2 to 7 nm were deposited by magnetron sputtering. The mechanical and wide-temperature tribological properties of the coatings were investigated. All the multilayer coatings exhibited enhanced hardness as compared with TiAgN nanolayer, which was attributed to the decrease in the disclination dipole motion and the grain boundary sliding. With the increase of the modulation period, the hardness decreased due to the reduced stress-accumulated interfaces. The maximum hardness of 27.6 GPa was revealed in TiAgN/W2 N multilayer (Λ = 2 nm). In the temperature range of 25 °C–500 °C, compared with TiAgN nanolayer, all the multilayer coatings exhibited improved friction properties due to the formation of lubricated oxides on the wear track. The lowest friction coefficient of 0.26 was revealed at 500 °C in TiAgN/W2 N multilayer (Λ = 2 nm), whereas the wear rate was 6.7 × 10 −6 mm 3 ·N −1 mm −1 . With the increase of the sliding temperature, the reduced friction coefficient and the increased wear rate for multilayer coatings were due to the more lubricative oxides. Sliding against A2 O3 ball, the main wear mechanism of the coatings was considered to be abrasive wear at room temperature, change to abrasive and oxidation wear at high temperature.