Journal
VACUUM
Volume 94, Issue -, Pages 14-18Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2013.01.006
Keywords
Diamond-like carbon; Coatings; Tribological performance; Lubricant additives; PAO-4
Funding
- International S&T Cooperation Project of China [2010DFR50070]
- National Natural Science Foundation of China [51005218]
- Fundamental Research Funds for the Central Universities [2010ZY36]
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Understanding the reaction between lubricant additives and diamond-like carbon coatings is imperative for the improvement of the friction and wear properties of mechanical parts with diamond-like carbon coatings. Diamond-like carbon coatings were deposited with ion beam deposition and the influence of lubricant additives on the friction coefficients and wear rates of diamond-like carbon coatings under the lubricated conditions was studied. It was revealed that the wear rates of diamond-like carbon coatings under unlubricated conditions are 1.5 x 10(-14) m(3)/(Nm) while they are decreased to 3 x 10(-17) m(3)/(Nm) to 1.7 x 10(-16) m(3)/(Nm) when lubricated by PAO-4 base oil with three additives. The addition of molybdenum dithiocarbamate in PAO-4 base oil decreases the friction coefficients of diamond-like carbon coatings to 0.07, but increases the wear rate of diamond-like carbon coatings. The addition of zinc dialkyl dithiophosphate to PAO-4 can slightly decrease the friction coefficient of diamond-like carbon coatings and improve the wear resistance of diamond-like carbon coatings. The addition of amine sulfuric-phosphate diester in PAO-4 can greatly decrease the wear rate of diamond-like carbon coatings to 3 x 10(-17) m(3)/(Nm) but has a negligible effect on the friction coefficients of diamond-like carbon coatings. (C) 2013 Published by Elsevier Ltd.
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