Temperature effects on mechanical properties of zinc dithiophosphate tribofilms

• Published in: Tribology international Vol. 39; no. 12; pp. 1558 - 1563
• Main Authors: Demmou, Karim, Bec, Sandrine, Loubet, Jean-Luc, Martin, Jean-Michel
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 01-12-2006; Elsevier
• Subjects: Applied sciences; Exact sciences and technology; Friction, wear, lubrication; Fundamental areas of phenomenology (including applications); Inelasticity (thermoplasticity, viscoplasticity...); Machine components; Mechanical engineering. Machine design; Nanoindentation; Physics; Solid mechanics; Structural and continuum mechanics; Temperature effects; Zinc dialkyl-ditihiophosphate (ZDTP) tribofilm; Zinc dialkyl-ditihiophosphate (ZDTP) tribofilm; Temperature effects; Nanoindentation; Atomic force microscopy; Plastic flow; Tribochemical reaction; Temperature effect; Mechanical properties; Nanostructure; Zinc compound; Flow point; Hardness; Experimental study; Layer thickness; Indentation; Microhardness; Modeling; Tribological coatings; Pressure effect; Antiwear additive; Dithiophosphates; Lubricant additive; Tribology
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2006.01.025

Nanoindentation tests were performed at several temperatures (24–80
°C) on one antiwear zinc dialkyl-dithiophosphate (ZDTP) tribofilm using a Nanoindenter XP
® entirely set into a climatic chamber. Mechanical properties of the tribofilm were determined using a simple model. AFM observations were conducted to estimate the order of magnitude of the film thickness. The effect of applied pressure on the elastic properties was demonstrated and taken into account in the present analysis. The use of the
F/
S
2 parameter, independent of contact geometry, revealed a hardness dependency upon temperature. Furthermore, careful AFM observations of the residual pile-up produced by plastic flow around the indents pointed out the evolution of the film deformation process with temperature.