Tribology of Diamond and Diamond‐Like Carbon Films

Engineering-scale superlubricity of the fingerprint-like carbon films based on high power pulsed plasma enhanced chemical vapor deposition

“…Previous studies have shown that superlubricity can be achieved by the hydrogenated and sulfur-doped hydrogenated carbon lms, where the ultralow friction originates from the passivation species in the test environment, such as H or S-H bonding. 61,62 However, for FP-C:H lms, there is no highly passive H bonds due to the oxygen enrichment 41 and though O-H has a higher bond energy than that of S-H 63 because the oxidation of carbon is preferred. Therefore, it seems reasonable to surmise that the special nanostructure in the FP-C:H lms greatly enhanced the tribological properties.…”

Low Friction at the Nanoscale of Hydrogenated Fullerene-Like Carbon Films

“…It is proposed that the phenomenon of opposite friction properties with roughness is stemmed from the variable hydrogen concentrations in the precursor gas. As it is known that hydrogen makes an important effect on the lubrication of the hydrogenated DLC films in the inert atmosphere, which is attributed to the large amount of hydrogen-terminated dangling bonds extending from the amorphous carbons [38]. Even so, there is also a maximum threshold of hydrogen to avoid the formation of hydrocarbon polymers [39,40].…”

Thermal effects influencing stability and performance of coatings in automotive applications

“…However, for the ceramic counterpart the maximum wear rate is shifted to a lower temperature of 135°C and the wear rate itself is smaller. In general, the increase of the wear rate with increasing temperature is a well-known effect [9]. For both counterpart materials debris were found in the contact zone which is attributed to graphitized DLC acting as a solid lubricant.…”