Tribological contact analysis of a rigid ball sliding on a hard coated surface

Effect of a hard sublayer on contact interaction and wear behavior of electrodeposited gold-based coatings

“…Therefore, the coatings deposited on the Ni-B sublayer are assumed to be intensively strain hardened that provides for their plastic resistance under multipass scratching. Wear of the Au-Ni coatings on conditions of dry friction is caused by their macroscopic elastoplastic deformation due to the action of the rider, interaction of microasperities on the friction pair surfaces as well as adhesive interaction [9][10][11]. Contact interaction between a hard rider and a rather soft coating under the only applied normal force is considered in terms of the classical Hertzian contact theory.…”

“…When applying the tangential force to the rider, combination of normal and tangential loads causes the area of maximum compressive stresses to displace towards the surface ahead of the rider [10]. Because the maximum stress was shown to exceed the coating yield strength, ploughing of the Au-Ni coating occurs with formation of the pileup regions along the wear track ( Fig.…”

Nanoscratch test — A tool for evaluation of cohesive and adhesive properties of thin films and coatings

“…Another important factor is a magnitude of residual stresses stored in coating-substrate system during deposition process. Extensive analysis of these contributions can be seen in Holmberg [2].…”

“…In the field of optical technology, single or multi-layered thin films can modify the optical properties of components to desired quality. Disc drives in computer industry, cutting tools and artificial joints also fully rely on special coatings and their performance [1,2].…”

Mechanical and high pressure tribological properties of nanocrystalline Ti(N,C) and amorphous C:H nanocomposite coatings

“…Such cracks result from high compressive stresses building up directly under the contact region and high tensile stresses developing outside the contact zone under load, leading to elastic/plastic deformation of the ncTi(N,C)/a-C:H layer and the substrate [20]. As the a-C:H content increases the elastic modulus is reduced, leading to an increase in the compressive stresses and a drop in the coating resistance to counterface ploughing [21], so the friction force increases. Furthermore, on a microstructural level, the following mechanism is probably operating: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 the increasing total C content of the coating leads to the crystallite size of the 'hard' Tibased phase to progressively decrease and tend to an amorphous state.…”