Tribological performance of DLC/DLC and steel/DLC contacts in the presence of additivated oil
by Abdul Mannan; M.F.M. Sabri; Md. Abul Kalam; Masjuki H. Hassan
International Journal of Surface Science and Engineering (IJSURFSE), Vol. 12, No. 1, 2018

Abstract: In this study, the tribological properties of ta-C DLC were largely influenced by the counter surfaces and additives. The DLC/DLC contact showed approximately 60% lower wear when tested with additivated oil compared to that of base oil and this result was 66% in steel/DLC contact. Friction coefficient in DLC/DLC contact was lower than in steel/DLC contact under both oils. But however, both contacts showed slightly higher friction coefficient under additivated oil compared to that of base oil. In steel/DLC, the thermo-chemical reaction between carbon and iron and/or the fusion of the transferred particles were prevented by additives which were present under base oil. The fracture found on DLC surface in steel/DLC contact under additivated oil indicates that the tribolayer formed on the steel surface would be of brittle nature. The passivation of surfaces in DLC/DLC contact by additives prevented the damage which was observed under base oil.

Online publication date: Tue, 27-Feb-2018

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