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

Tribological behaviour of an electrochemical jet machined textured Al-Si automotive cylinder liner material
Tribological behaviour of an electrochemical jet machined textured Al-Si automotive cylinder liner material
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 6 μm finish followed by immersion in 1 mol 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 220 A/cm2. An array of hemispherical dimples at 1.5 mm spacing was created, with an average diameter of 420 μm and depth of 40 μm, corresponding to an ε ratio of 0.095. Lubricated reciprocating sliding was carried out at stroke length of 25 mm in a bath of PAO (4 cSt) against a 52100 cylinder of 6mm diameter and 16mm length. Sliding frequencies were incremented at 1 Hz intervals between 1–15 Hz at 50 N load increments from 50-200 N. 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.
0043-1648
1611-1621
Walker, John
b300eafd-5b0a-4cf5-86d2-735813b04c6f
Kamps, Timothy
fde15660-4064-4ba7-96dd-7c8ba6e929d0
Lam, Jia
d3c59023-dc9f-4777-8e67-8cf99ca8f005
Mitchell-Smith, Jonathon
b756ff9c-97f4-4ec4-a4cf-90aa1064dc38
Clare, Adam
bb20eb07-54cc-4758-8404-fb8e177317b8
Walker, John
b300eafd-5b0a-4cf5-86d2-735813b04c6f
Kamps, Timothy
fde15660-4064-4ba7-96dd-7c8ba6e929d0
Lam, Jia
d3c59023-dc9f-4777-8e67-8cf99ca8f005
Mitchell-Smith, Jonathon
b756ff9c-97f4-4ec4-a4cf-90aa1064dc38
Clare, Adam
bb20eb07-54cc-4758-8404-fb8e177317b8

Walker, John, Kamps, Timothy, Lam, Jia, Mitchell-Smith, Jonathon and Clare, Adam (2017) Tribological behaviour of an electrochemical jet machined textured Al-Si automotive cylinder liner material. Wear, 376-377 (Part B), 1611-1621. (doi:10.1016/j.wear.2017.01.085).

Record type: Article

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 6 μm finish followed by immersion in 1 mol 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 220 A/cm2. An array of hemispherical dimples at 1.5 mm spacing was created, with an average diameter of 420 μm and depth of 40 μm, corresponding to an ε ratio of 0.095. Lubricated reciprocating sliding was carried out at stroke length of 25 mm in a bath of PAO (4 cSt) against a 52100 cylinder of 6mm diameter and 16mm length. Sliding frequencies were incremented at 1 Hz intervals between 1–15 Hz at 50 N load increments from 50-200 N. 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.

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More information

Accepted/In Press date: 23 January 2017
e-pub ahead of print date: 15 June 2017
Published date: 2017
Additional Information: Funded by EPSRC: In Jet Interferometry for Ultra Precise Electrolyte Jet Machining (EP/M02072X/1)
Organisations: Energy Technology Group

Identifiers

Local EPrints ID: 405079
URI: http://eprints.soton.ac.uk/id/eprint/405079
ISSN: 0043-1648
PURE UUID: 2a929aa0-273d-4542-8f78-be6deb40ef0b
ORCID for Timothy Kamps: ORCID iD orcid.org/0000-0002-6660-7070

Catalogue record

Date deposited: 26 Jan 2017 14:54
Last modified: 22 Nov 2021 05:05

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Contributors

Author: John Walker
Author: Timothy Kamps ORCID iD
Author: Jia Lam
Author: Jonathon Mitchell-Smith
Author: Adam Clare

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