Sliding wear of a-C:H coatings against alumina in corrosive media

Abstract

is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. This paper reports the results obtained from the study of friction and sliding wear in two corrosive solutions of an a-C:H coating deposited on 316L stainless against an alumina ball, employed as static counterpart. Calculations of the values of the von Mises stresses developed at the coating-substrate interface, as soon as the ball touches the coated sample, and how this state of stress influences the response of the coated system under the corrosion environment, are presented and discussed. The results obtained from these calculations, as well as from the experiments conducted in the present research, are compared with other experiments published in the literature, where a-C:H coatings deposited on different substrates and with different coating architectures were tested in similar corrosive media. It has been determined that in those systems, where the von Mises stress in the coating, found in the vicinity of the interface, exceeds the threshold value of approximately 370 MPa, coating failure with spallation will take place, regardless of the substrate nature on which this coating has been deposited. From this analysis it has been concluded that the coating yield strength is of utmost importance in conferring the a-C:H coated system the required stability in a corrosive solution.

Tribological Properties of Si-Doped Graphite-Like Amorphous Carbon Film of PEEK Rubbing with Different Counterparts in SBF Medium

“…Li et al [35,36] indicated that the formation of oxide on the counterpart could influence the formation of transfer film and affect the wear behavior of DLC films. Staia et al [37] indicated the effect of the SBF and 3.5 % NaCl solutions on the sliding wear of an a-C:H coating. From the view of the interfacial tribo-chemistry, the corrosive oxidation of 100Cr6 steel tribo-pair occurs as follows [33]:…”

Corrosion fatigue in DLC-coated articulating implants: an accelerated methodology to predict realistic interface lifetime

“…Xie et al [21] showed that under indentation loads, lateral cracking at the interface occurs, and proposed the nucleation and propagation of ring and radial cracks as the main mechanism of coating fracture. Even more, Staia et al [22] quantified a threshold stress value of 370 MPa at the vicinity of the interface, from which the nucleation and propagation of cracks will lead to the DLC-coating failure.…”

A description of the composite elastic modulus of multilayer coated systems

“…However, as indicated in Appendix 1, the model requires some knowledge of the Poisson ratio of the materials, which constitute the different layers of the multilayer coating. In the present case, it has been assumed that ν (DLC) = 0.30 [41], ν (CrC) = 0.33 [42], ν (CNiPCr) = 0.31 [43] and ν (NiP) = 0.30 [44].…”