Diamond-like carbon coatings (DLCs) are considered to hold great promise for improvement in friction and wear resistance of engine parts. It is hence interesting to know whether conventional engine oil additives such as ZDDP can form tribofilms and reduce friction and wear in DLC contacts as effectively as they do in steel on steel contacts. This paper compares the behaviour with ZDDP of six different DLC coatings. It is seen that ta-C gives lower boundary friction than the other types while a-C:H gives better wear prevention. A ZDDP-derived tribofilm forms on all DLCs but a pad-like structure is seen only on W-DLC in DLC/DLC tribopairs.
Tribology International – Elsevier
Published: Feb 1, 2011
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