Structure and tribological properties of Si/a-C:H(Ag) multilayer film in stimulated body fluid

doi:10.1088/1674-1056/ab9c10

Abstract

Si/a-C:H(Ag) multilayer films with different modulation periods are prepared to test their potential applications in human body. The composition, microstructure, mechanical and tribological properties in the simulated body fluid are investigated. The results show the concentration of Ag first decreases and then increases with the modulation period decreasing from 984 nm to 250 nm. Whereas the C content has an opposite variation trend. Notably, the concentration of Ag plays a more important role than the modulation period in the properties of the multilayer film. The a-C:H sublayer of the film with an appropriate Ag concentration (8.97 at.%) (modulation period of 512 nm) maintains the highest sp³/sp² ratio, surface roughness and hardness, and excellent tribological property in the stimulated body fluid. An appropriate number of Ag atoms and size of Ag atom allow the Ag atoms to easily enter into the contact interface for load bearing and lubricating. This work proves that the Ag nanoparticles in the a-C:H sublayer plays a more important role in the tribological properties of the composite-multilayer film in stimulated body fluid condition.

Keywords: Si/a-C:H(Ag) multilayer film modulation periods Ag concentration tribological properties

Received: 21 April 2020
Revised: 25 May 2020
Accepted manuscript online: 12 June 2020

Fund: the National Natural Science Foundation of China (Grant Nos. 51801133, 51505318, and 51671140), the Science and Technology Major Project of Shanxi Province, China (Grant No. 20181102013), the Shanxi Provincial Youth Fund, China (Grant No. 201801D221135), and the “1331 Project” Engineering Research Center of Shanxi Province, China (Grant No. PT201801).

Corresponding Authors: ^†Corresponding author. E-mail: yushengwang@tyut.edu.cn ^‡Corresponding author. E-mail: wyc@tyut.edu.cn

Cite this article:

Yan-Xia Wu(吴艳霞), Yun-Lin Liu(刘云琳), Ying Liu(刘颖), Bing Zhou(周兵), Hong-Jun Hei(黑鸿君), Yong Ma(马永), Sheng-Wang Yu(于盛旺), and Yu-Cheng Wu(吴玉程) Structure and tribological properties of Si/a-C:H(Ag) multilayer film in stimulated body fluid 2020 Chin. Phys. B 29 116101

Fig. 1.

Typical cross-sectional FESEM images of multilayer films with different modulation periods.

Table 1.

Chemical compositions of multilayer films with different modulation periods.

Fig. 2.

XPS spectra of Ag 3d in multilayer film.

Fig. 3.

XPS spectra of C 1s peaks in multilayer film fitted by deconvoluted peaks.

Fig. 4.

XRD pattern of A1 (highest C content) and A3 (lowest C content) sample.

Fig. 5.

Raman spectra, including deconvolution peaks, obtained from Si/a-C:H(Ag) multilayer films.

Table 2.

I_D/I_G ratios and G peak positions of multilayer film.

Fig. 6.

(a) Curves for FTIR information of multilayer film and (b) their partial amplification.

Fig. 7.

AFM images of 3 μm × 3 μm area of multilayer films.

Fig. 8.

Hardness and elastic modulus of multilayer films.

Fig. 9.

Frictional curves of multilayer films, measured by tribometer on reciprocating ball-on-disk tribometer in simulated body fluid against Al₂O₃ steel ball at room temperature.

Fig. 10.

The 3D optical profile images of worn track on film.

Fig. 11.

SEM images of the corresponding Al₂O₃ ball surfaces.

Fig. 12.

Schematic illustration of tribological mechanism of A2 sample in stimulated body fluid.

Table 3.

Chemical compositions of transfer film on Al₂O₃ ball.

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