Model scale generation and microscopic characterisation of tribofilms formed on Fe and Cu alloys

Abstract

The layer-forming properties of different lubricants on technically used tribosystems were investigated. The experiments were carried out on a ring-on-disc test set-up on Fe/Fe-and Fe/Cu-based systems. Three different lubricants were used viz. base oil with detergents (Oil-A), oil with ZnP-based additives (Oil-B) and oil with P-based additives (Oil-C). We measured the electrical resistance between the rubbing surfaces. Surface characterisation (light microscopy, SEM/EDX and XPS) and tribometric results show differences in wear and friction properties. Oil-B showed profound layer formation on steel counterparts and correlation in the amount of Zn and S, P and O, respectively; whereas, none of the above was observed with Oil-A. Oil-C, however, showed thin but tribologically effective layer formation on ferrous system and a superior performance for the Fe/Cu system.

Tribological study of crankshaft bearing systems: Comparison of forged steel and cast iron counterparts under start–stop operation

“…The wear of the softer bearing material was measured gravimetrically. Further details of the used test methodology are given in previous works of the authors [8][9][10][11].…”

Applicability of ring‐on‐disc and pin‐on‐plate test methods for Cu–steel and Al–steel systems for large area conformal contacts

“…The tests were carried out in accordance to ASTM D 3702 standard on a rotary tribometer TE92, also from Phoenix Tribology. A detailed account of the test setup has been described in Grün et al . The steel ring, polished to R a ~0.03 µm perpendicular to the polishing direction, is mounted in the bottom part of the test cell.…”