In Vitro Evaluation of the Tribological Response of Mo-Doped Graphite-like Carbon Film in Different Biological Media

Abstract

Complicated tribochemical reactions with the surrounding media often occur at the prosthesis material, which is a dominant factor causing the premature failure in revision surgery. Graphite-like carbon (GLC) film has been proven to be an excellent tribological adaption to water-based media, and this work focused on the friction and wear behavior of Mo-doped GLC (Mo-GLC)-coated poly(aryl ether ether ketone) sliding against Al2O3 counterpart in physiological saline, simulated body fluid, and fetal bovine serum (FBS), which mainly emphasized the interface interactions of the prosthetic materials/lubricant. Results showed different tribological responses of Mo-GLC/Al2O3 pairs strongly correlated with the interfacial reactions of the contacting area. Particularly, a transfer layer was believed to be responsible for the excellent wear reduction of Mo-GLC/Al2O3 pair in FBS medium, in which graphitic carbon and protein species were contained. The wear mechanisms are tentatively discussed according to the morphologies and chemical compositions of the worn surfaces examined by scanning electron microscope as well as X-ray photoelectron spectroscopy.

Mechanism of contact pressure-induced friction at the amorphous carbon/alpha olefin interface

“…In recent years, amorphous carbon (a-C) films have become increasingly popular in both the scientific and engineering communities because of their impressive combination of high hardness, low friction coefficient, and chemical inertness. [1][2][3][4] These properties can provide effective protection against serious mechanical or chemical damage of moving mechanical components, such as tools, 5 automobile engines, 6 aerospace components, 7 and artificial joints. 8,9 However, a-C films inevitably undergo self-consumption, which severely limits their lifetime and reliability and ultimately leads to the catastrophic failure of the coated surface.…”

Understanding the run-in tribological behavior of amorphous carbon films against Al2O3balls under high vacuum

“…[37][38][39] And Al 2 O 3 wear particles produced during the friction test also could lead to high friction coefficient. 40 Importantly, the Al 2 O 3 sliding against Al 2 O 3 exhibited high friction coefficient under vacuum. 41 Thus, the high friction coefficient at the second stage ("B") may be attributed to the amorphous carbon and Al 2 O 3 wear particles.…”

Synergistic improving of tribological properties of amorphous carbon film enhanced by F–Si-doped multilayer structure under corrosive environment

“…In our own study, it is believed to be the result of the formation of solidlike film resulting from the tribochemical reaction among HCl, film and the corresponding counterpart. In the our previous study,[43] such a lubricating effect of solidlike film would reduce wear as well as friction between the contacting surfaces under boundary lubrication regimes.From Fig. 8, the thin hydrogenated amorphous carbon film was easily worn out in 0.1 M HCl, indicating poorly adhesion to steel substrate.…”

“…The specific parameters are listed in Table 1. Huang et al reported that the lubrication regions could be well divided into three regions accodingto the  ratio [43]. They pointed out that 0s -1 , the viscosity value of 0.1 M HCl of 1.205 × 10 -3 μPa s at 25 °C.…”