Design and characterisation of an advanced duplex system based on carbon S-phase case and GiC coatings for 316LVM austenitic stainless steel

Micro-scale impact testing - A new approach to studying fatigue resistance in hard carbon coatings

“…The nanoindentation data summarised in Table 1 show that both coatings have broadly similar hardness and elastic modulus but since the harder film (Dymon-iC) is lower modulus significant differences in H/E and H 3 /E 2 . The values of hardness are low compared to some a-C and a-C:H films but are close to reported values on other Graphit-iC and Dymon-iC films deposited by CFUBMSIP [16,17,20,21].…”

“…Plastic deformation of the substrate is followed by circumferential cracks at the edge of the indent and radial cracks underneath the indent, which can ultimately result in cohesive and adhesive failures [6,9]. Common strategies to improve the resistance to contact damage include deposition of adhesion promoting interlayers, multilayering, changing sp 3 /sp 2 through bias control, gradient layers, metal doping, deposition of load-supporting sub-layers [13][14][15][16][17][18][19][20][21][22][23][24][25]. Bernoulli and co-workers have reported that for biomedical applications deposition of a ductile -Ta interlayer with elastic properties close to that of the DLC film was able to reduce the severity of ring cracking when indented by a 10 m probe to 500 mN, which finite element analysis (FEA) suggested was due to the stress being distributed across the coating-interlayer and interlayer-substrate interfaces [6].…”

“…Duplex surface engineering has been employed to increase the load-carrying capacity of soft metallic substrates. Dong and co-workers reported plasma carburizing of stainless steel to produce a carbon-rich S-phase case layer prior to a multilayer deposition (columnar Cr interlayer, graded Cr/C multilayer, amorphous Cr doped carbon layer) [20], and boost-diffusion oxidation of Ti6Al4V prior to deposition of similar a-C coating system [21].…”

“…The coatings were deposited on a hard steel substrate (M42 tool steel) providing enhanced load support. Both of these coating systems have been shown to have high wear resistance in pin-on-disk tests in air and under lubricated conditions [14][15][16][17][19][20][21][22]. Carbon-chromium coatings produced by the unbalanced magnetron sputtering have been reported to have a graphitic structure with no long range order [14][15][16][17].…”

In vitro evaluation of physical vapor deposition coated beta titanium orthodontic archwires

“…15 In recent times, the carbon-based coatings have also attracted attention in the medical arena owing to their good biocompatibility. 16 Coatings of TiAlN were deposited using cathodic arc vapor (plasma or arc ion plating) deposition. The high ionization ratio and high deposition rate of cathodic arc process leads to the formation of a very dense and adherent coating imparting improvement in the lifetime of substrate as well as its wear and corrosion resistance.…”