Contribution of roughness parameters in the scuffing performance of metallic surfaces

Abstract

Purpose

Boundary lubrication cannot provide long-term protection against scuffing. Therefore, it is fundamental to recognise the breaking point of the boundary layer that activates scuffing. Based on this assumption, three-dimensional (3D) morphologies of surfaces were characterised, and the fundamental conditions of the scuffing process were investigated to identify the transition from boundary lubrication conditions to catastrophic wear.

Design/methodology/approach

A series of systematic tribological double-blind experiments were carried out using a poorly lubricated cylinder/plane interface to model the tribological inverse problem in a boundary lubrication situation. Areal morphological analysis was performed, with the help of an optical interferometer, on a millimetric area corresponding to the contact surface during experimental tribological investigations. The statistical correlation between scuffing and the selected morphological parameters was evaluated. This evaluation study consisted of determining the linear, logarithmic, exponential, polynomial (of degree 2) or power dependency between time to scuffing and morphological parameters.

Findings

A clear, statistically confirmed relationship was observed between selected morphological parameters of the surface (Spd, Sha, Str, Sz) and its scuffing performance.

Originality/value

3D morphological parameters that best specified the technological scuffing performance of metallic surfaces were selected and proposed.

Citation

Wojciechowski, L., Majchrowski, R. and Mathia, T.G. (2017), "Contribution of roughness parameters in the scuffing performance of metallic surfaces", Industrial Lubrication and Tribology, Vol. 69 No. 4, pp. 507-515. https://doi.org/10.1108/ILT-05-2016-0116