Diamond-like carbon (DLC) is well known as amorphous material which shows excellent mechanical properties such as hardness, wear resistance, low friction, and also chemical stability. It can also provide an ultra-low friction state to the friction system when it is combined with some specific lubricants, together with or without additives. Many researchers have studied the lubrication performance of DLC coating using conventional and some special experimental techniques. Typically, the tribology-related studies on DLC film has confirmed that it inherently lubricates by itself and inhibits abrasive, adhesive and corrosive wear because of their high chemical inertness. Furthermore, Erdemir reported that the lowest friction coefficient was measured on DLC films when the surface was covered by atomic hydrogens. However, a detailed friction reduction and ultra-low friction mechanism has not yet been unveiled. In the present study, to address such tribological problem, we investigated the atomistic friction mechanism of DLC using our own computational chemistry methods.
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