The Effect of Orienting Carbon Coatings Alloyed with Carbide-Forming Elements on the Antifriction Properties of Lubricants

Doping Diamond-Like Carbon Coatings on Rubbing Parts as a Method for Improving Antifriction Properties of Lubricants

“…Below we consider the effect on the antifriction properties of two model lubricants (inactive polyalphaolefin PAO-4 oil + 1% zinc dialkyldithiophosphate ZnDTP and PAO-4 + 1% molybdenum dithiocarbamate MoDTC) exerted by doping monocrystalline carbon m-C with tungsten, and with another refractory transition metal such as molybdenum [12], as well as for comparison, m-C doped with silicon. Both the additives under comparison are sulfur-containing.…”

“…Silicon is widely used as an element for doping diamond-like coatings. There are not many special studies on the effect of DLCs doped with silicon for the working surfaces in lubricated friction units [4,5,12]. According to [12], the doping of the m-C coating with silicon almost does not affect the friction coefficient.…”

“…There are not many special studies on the effect of DLCs doped with silicon for the working surfaces in lubricated friction units [4,5,12]. According to [12], the doping of the m-C coating with silicon almost does not affect the friction coefficient. The authors of [12] have concluded that, in the case of this material, the antifriction effects originating from the coating and from the doping of the coating are not summarize.…”

“…According to [12], the doping of the m-C coating with silicon almost does not affect the friction coefficient. The authors of [12] have concluded that, in the case of this material, the antifriction effects originating from the coating and from the doping of the coating are not summarize. Of great interest are the studies presented in [5], in which the authors have analyzed the mechanism of an increase in the oil lubricity under doping DLCs with silicon and its difference from the mechanism for increasing oil lubricity by means of doping carbon coatings with W and Mo.…”

“…Friction coefficient depending on the test duration (a) under lubrication with PAO-4 oil + 1% ZnDTP and (b) under lubrication with PAO-4 oil + 1% MoDTC. (1) steel/steel friction pair; (2) steel/m-C friction pair; (3) steel/W-m-C friction pair; (4) steel/Si-m-C friction pair; (5) steel/Mo-m-C friction pair (according to[12]).…”