Method and surface roughness aspects for the design of DLC coatings

Diamond like carbon coatings for tribology: production techniques, characterisation methods and applications

“…148 One of the main reasons for incorporating silicon into DLC is that it has been found to reduce the dynamic friction coefficient in ambient humidities (>2%RH) 140,145,149,150 where the tribological properties of conventional Si-free DLC deteriorate. 130,131 The associated wear rate of Si-DLC films is generally higher, sometimes only slightly, 145,151 but increases of as much as a factor of 4 have been seen. 149 The reduction in friction coefficient has been attributed to both the formation of SiO 2 at the frictional interface, 140,141 and an increase in the sp 3 content to give a less graphitic film.…”

The influence of carbon based coatings and surface finish on the tribological performance in high-load contacts

“…High surface roughness generates similar contact spots and the high tensional stresses can enhance the crack generation and delamination of the coating. It has also been reported that for the coatings with more compliant nature compared to the substrate, will experience lower tensional stresses [32,33]. The plastic deformation of the substrate material and the tensional stresses generated in coatings have the major effect on the delamination of coatings deposited on the ground surfaces.…”

“…As the plastic deformation occurs in the substrate the load carrying capacity is lost and the coating easily delaminates from the substrate surface. By FEM modelling Lindholm et al [32] have also shown that the surface roughness and material properties have a significant effect on the tensional stress level in the coating. Particularly small, closely packed, sharp asperities give small and dense contact spots that result in high tensional stress in the coating.…”

X-Ray Photoelectron Spectroscopy for Characterization of Engineered Elastomer Surfaces

“…PTFE is commonly used as a coating on metallic substrates and it has been recently optimised for use on elastomers yielding low friction coefficient and enhancing other properties [75,76]. Diamond like carbon (DLC) is another very promising candidate for coatings due to its excellent tribological properties and chemical inertness [6]. DLC coatings h a v e b e e n w i d e l y u s e d o n d i f f e r e n t s u b s trates including metals, ceramics and other inorganic materials.…”

“…Among various coatings, amorphous diamond-like carbon (DLC) is considered by various authors as a good candidate for application on elastomer surfaces [5]. Such coatings have excellent tribological behaviour, i.e., low friction coefficient and wear rate [6].…”