Wear mechanisms of steel roller bearings protected by thin, hard and low friction coatings

Fatigue-like failure of thermally oxidised titanium in reciprocating pin-on-plate wear tests

“…Spallation of coatings from substrates during tribological testing has been observed for a range of tests and coating-substrate combinations at one institution alone [17][18][19]. While other research groups have reported similar behaviour (for example [20,21]) this type of failure may be even more prevalent but can only identified by careful interrupted tests where the interruption intervals are suitably chosen.…”

“…For rolling contact tests most groups have adopted an Amsler (disc-on-disc) machine apparatus [22][23][24]. Due to the length of time required for Amsler tests however thrust-washer-type rolling contact fatigue tests have also been used [19,25]. Impact testing of surface engineered materials has been investigated by a number of authors [22,[26][27][28] in particular for tribological applications where high shock loads are encountered (in interrupted cutting for instance [26]).…”

Finite element analysis of frictional contact of elastic solids with thin and moderately thick coatings

“…Numerical techniques, such as the finite element method (FEM) and boundary element method (BEM), are also widely used in the analysis of contact mechanic problems with thin coating (Komvopoulos, 1988;Hong and Saka, 1991;Djabella and Arnell, 1993;Sun et al, 1995;Njiwa et al, 1998;Diao and Kandori, 2006). The thin-coating technique is generally used in structural components such as gears, bearings, machine tools, and artificial hip joints to improve their surface mechanical properties (Sen et al, 1989;Liu et al, 2003;Yonekura et al, 2005;Bruno et al, 2006;Martins et al, 2006). Therefore, in this paper, thin-coated joints such as ball and socket, ball on a flat plate, roller on a guide, and spur gear are analysed by FEM.…”

Tribological properties of non‐ferrous coating lubricated with rapeseed oil containing lubricant additives

“…Chromium nitride (CrN) coatings are well known to the tooling and forming industries due to their low friction, high thermal stability, low deposition temperatures, high hardness, good wear resistance and high corrosion resistance properties . This coating is basically used for multiple machining and parts applications such as on cutting tools and automotive components, especially for shims and piston rings where the components operate in lubricated condition . At present, the magnetron sputtering has been used to deposit CrN coatings.…”