The effect of model compounds on load-carrying capacity of a-C:H:W coated elements. Part II. Selected organic sulphur and phosphorus compounds
Journal Title: Tribologia - Year 2009, Vol 223, Issue 1
Abstract
This paper is the continuation of previous research and reflects the results of sulphur and phosphorus containing tribological compounds considered as potential anti-wear additives for heavy-loaded a-C:H:W coated machine parts. In Part I [L. 1] the results focused on CHO and CHNO model compounds were presented. In the present work four kinds of organic sulphur compounds and two kinds of organic phosphorus compounds were investigated. The compounds were added at 0.1% wt. and 1% wt. concentration in PAO-8 base oil. The a-C:H:W coating was deposited on bearing steel (100Cr6) balls using PVD reactive sputtering. The loadcarrying capacity was measured as scuffing load using the T-02 four-ball apparatus. Similarly as in [L. 1], both uncoated steel balls and the steel aC:H:W coated balls were investigated, and the method with continuously increasing load was applied. For a-C:H:W coated balls using 0.1% wt. and 1% wt. concentration of organic sulphur compounds, in the base oil, only 1-adamantanethiol showed a slight increase in the scuffing load value. The increase in concentration of benzyl disulphide (BDS) up to 1% wt. increased the scuffing load values for the uncoated steel tribosystem, but the increase in concentration of this compound is harmful for coated balls. Also the both organic phosphorus compounds at the treat rate of 0.1% and 1% wt. in the base oil did not show any improvement in scuffing load values for the coated balls. On the other hand, the increasing concentration of these phosphorus containing compounds in the base oil, improved the loadcarrying capacity of the steel tribosystem. Thus, this work also aims at accounting for the action mechanism difference of BDS interaction with steel and the coating. The same is due to the tested phosphorus containing model compounds. This paper contributes to better understanding the interaction of sulphur and phosphorus containing compounds and shows that such kind of compounds are not effective for increasing the load-carrying capacity of a-C:H:W coated machine parts. Presently the research is being continued with focus on commercial additives and new materials.<br/><br/>
Authors and Affiliations
Mihaela Vlad, Czesław Kajdas, Remigiusz Michalczewski
Keywords
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