Tribological behaviour of an electrochemical jet machined textured Al-Si automotive cylinder liner material

Walker, J.C. and Kamps, T.J. and Lam, J.W. and Mitchell-Smith, Jonathon and Clare, Adam T. (2017) Tribological behaviour of an electrochemical jet machined textured Al-Si automotive cylinder liner material. Wear . ISSN 1873-2577 (In Press)

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Abstract

This paper investigates the use of Electrochemical Jet Machining to surface texture a hyper-eutectic Al-Si cylinder liner material. Samples were lapped to a 6μm finish followed by immersion in 1mol NaOH to expose the primary silicon colonies above the aluminium surface. Texturing was carried out using a NC system comprising of a fine gauge nozzle (cathode) jetting a solution of 2.3 mol NaCl on the surface (anode) whilst applying a current density of 220A/cm2. An array of hemispherical dimples at 1.5mm spacing was created, with an average diameter of 420μm and depth of 40μm, corresponding to an ε ratio of 0.095. Lubricated reciprocating sliding was carried out at stroke length of 25mm in a bath of PAO (4cSt) against a 52100 cylinder of 6mm diameter and 16mm length.

Sliding frequencies were incremented at 1Hz intervals between 1-15Hz at 50N load increments from 50-200N. Stribeck curves indicated a reduction of the friction coefficient due to texturing of up to 0.05 in the mixed lubrication regime, representing a decrease of 38.5%. Optical profilometry and SEM indicated that abrasion and formation of a surface tribo-layer was mitigated in regions of the Al-Si surface where textured features were present parallel to the sliding direction.

Item Type: Article
Keywords: Surface Texturing; Automotive; Al-Si; Friction; Wear; Electrochemical Jet Machining
Schools/Departments: University of Nottingham, UK > Faculty of Engineering
Depositing User: Hatton, Mrs Kirsty
Date Deposited: 27 Jan 2017 10:58
Last Modified: 18 Oct 2017 18:55
URI: http://eprints.nottingham.ac.uk/id/eprint/40140

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