Roughness and wettability of surfaces in boundary lubricated scuffing wear

L. Wojciechowski, K. J. Kubiak, T. G. Mathia

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The diversity of multidisciplinary approaches suggests that fundamentals of scuffing require systemic, complex multi-scale and multi-physics analysis of an irreversible process as it is postulated in present study. That is probably one of the reasons of lack of an unequivocal model of this irreversible transitional process from stable more or less lubricated wear to scuffing described only by one or few authors in equation(s) form. Therefore, it is useful to characterize the tribological surface properties in frame of systemic approach looking simultaneously for the optimal compromise between rheological, morphological and physicochemical features of contacting surface's layer. Hypothetical role connected to any group of features in the topological approach is elucidated and experimentally confirmed via the wettability, strongly combined with surface roughness and surface free energy. Due to the fact that the free energy is directly related to the surface wettability it can as well affect the scuffing activation process. For scientific and rhetoric reasons some selected results of limited boundary lubrication investigations under double blind trial conditions in case of gear oil with anti-wear (AW) and extreme pressure (EP) additives are elucidated here. The results issued from scuffing tests on AISI 4140 ground steel burnished under different forces in order to generate different surface roughness, residual stresses and surface energy are analyzed. It was stated and numerically correlated that the wettability by lubricating medium influences the scuffing resistance. Additionally, the dependence of wettability on selected parameters of roughness and a time to scuffing activation have been stated. On that basis, it is proposed to reinforce concept of "oleophilic" and "oleophobic" properties of metallic surfaces as autonomous invariants determining the activation of catastrophic wear process under boundary lubricated conditions.

Original languageEnglish
Pages (from-to)593-601
Number of pages9
JournalTribology International
Volume93
Issue numberPart B
Early online date22 Apr 2015
DOIs
Publication statusPublished - Jan 2016

Fingerprint

wettability
Wetting
roughness
Surface roughness
Wear of materials
irreversible processes
Chemical activation
activation
Free energy
surface roughness
free energy
boundary lubrication
Steel
Interfacial energy
surface properties
surface energy
Lubrication
residual stress
Surface properties
Gears

Cite this

Wojciechowski, L. ; Kubiak, K. J. ; Mathia, T. G. / Roughness and wettability of surfaces in boundary lubricated scuffing wear. In: Tribology International. 2016 ; Vol. 93, No. Part B. pp. 593-601.
@article{b5e71dffac534217922d32b7632e2d64,
title = "Roughness and wettability of surfaces in boundary lubricated scuffing wear",
abstract = "The diversity of multidisciplinary approaches suggests that fundamentals of scuffing require systemic, complex multi-scale and multi-physics analysis of an irreversible process as it is postulated in present study. That is probably one of the reasons of lack of an unequivocal model of this irreversible transitional process from stable more or less lubricated wear to scuffing described only by one or few authors in equation(s) form. Therefore, it is useful to characterize the tribological surface properties in frame of systemic approach looking simultaneously for the optimal compromise between rheological, morphological and physicochemical features of contacting surface's layer. Hypothetical role connected to any group of features in the topological approach is elucidated and experimentally confirmed via the wettability, strongly combined with surface roughness and surface free energy. Due to the fact that the free energy is directly related to the surface wettability it can as well affect the scuffing activation process. For scientific and rhetoric reasons some selected results of limited boundary lubrication investigations under double blind trial conditions in case of gear oil with anti-wear (AW) and extreme pressure (EP) additives are elucidated here. The results issued from scuffing tests on AISI 4140 ground steel burnished under different forces in order to generate different surface roughness, residual stresses and surface energy are analyzed. It was stated and numerically correlated that the wettability by lubricating medium influences the scuffing resistance. Additionally, the dependence of wettability on selected parameters of roughness and a time to scuffing activation have been stated. On that basis, it is proposed to reinforce concept of {"}oleophilic{"} and {"}oleophobic{"} properties of metallic surfaces as autonomous invariants determining the activation of catastrophic wear process under boundary lubricated conditions.",
keywords = "Boundary lubrication, Scuffing, Surface roughness, Wettability",
author = "L. Wojciechowski and Kubiak, {K. J.} and Mathia, {T. G.}",
note = "Published Jan 2016. HN 20/10/2017",
year = "2016",
month = "1",
doi = "10.1016/j.triboint.2015.04.013",
language = "English",
volume = "93",
pages = "593--601",
journal = "Tribology International",
issn = "0301-679X",
publisher = "Elsevier Inc.",
number = "Part B",

}

Roughness and wettability of surfaces in boundary lubricated scuffing wear. / Wojciechowski, L.; Kubiak, K. J.; Mathia, T. G.

In: Tribology International, Vol. 93, No. Part B, 01.2016, p. 593-601.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Roughness and wettability of surfaces in boundary lubricated scuffing wear

AU - Wojciechowski, L.

AU - Kubiak, K. J.

AU - Mathia, T. G.

N1 - Published Jan 2016. HN 20/10/2017

PY - 2016/1

Y1 - 2016/1

N2 - The diversity of multidisciplinary approaches suggests that fundamentals of scuffing require systemic, complex multi-scale and multi-physics analysis of an irreversible process as it is postulated in present study. That is probably one of the reasons of lack of an unequivocal model of this irreversible transitional process from stable more or less lubricated wear to scuffing described only by one or few authors in equation(s) form. Therefore, it is useful to characterize the tribological surface properties in frame of systemic approach looking simultaneously for the optimal compromise between rheological, morphological and physicochemical features of contacting surface's layer. Hypothetical role connected to any group of features in the topological approach is elucidated and experimentally confirmed via the wettability, strongly combined with surface roughness and surface free energy. Due to the fact that the free energy is directly related to the surface wettability it can as well affect the scuffing activation process. For scientific and rhetoric reasons some selected results of limited boundary lubrication investigations under double blind trial conditions in case of gear oil with anti-wear (AW) and extreme pressure (EP) additives are elucidated here. The results issued from scuffing tests on AISI 4140 ground steel burnished under different forces in order to generate different surface roughness, residual stresses and surface energy are analyzed. It was stated and numerically correlated that the wettability by lubricating medium influences the scuffing resistance. Additionally, the dependence of wettability on selected parameters of roughness and a time to scuffing activation have been stated. On that basis, it is proposed to reinforce concept of "oleophilic" and "oleophobic" properties of metallic surfaces as autonomous invariants determining the activation of catastrophic wear process under boundary lubricated conditions.

AB - The diversity of multidisciplinary approaches suggests that fundamentals of scuffing require systemic, complex multi-scale and multi-physics analysis of an irreversible process as it is postulated in present study. That is probably one of the reasons of lack of an unequivocal model of this irreversible transitional process from stable more or less lubricated wear to scuffing described only by one or few authors in equation(s) form. Therefore, it is useful to characterize the tribological surface properties in frame of systemic approach looking simultaneously for the optimal compromise between rheological, morphological and physicochemical features of contacting surface's layer. Hypothetical role connected to any group of features in the topological approach is elucidated and experimentally confirmed via the wettability, strongly combined with surface roughness and surface free energy. Due to the fact that the free energy is directly related to the surface wettability it can as well affect the scuffing activation process. For scientific and rhetoric reasons some selected results of limited boundary lubrication investigations under double blind trial conditions in case of gear oil with anti-wear (AW) and extreme pressure (EP) additives are elucidated here. The results issued from scuffing tests on AISI 4140 ground steel burnished under different forces in order to generate different surface roughness, residual stresses and surface energy are analyzed. It was stated and numerically correlated that the wettability by lubricating medium influences the scuffing resistance. Additionally, the dependence of wettability on selected parameters of roughness and a time to scuffing activation have been stated. On that basis, it is proposed to reinforce concept of "oleophilic" and "oleophobic" properties of metallic surfaces as autonomous invariants determining the activation of catastrophic wear process under boundary lubricated conditions.

KW - Boundary lubrication

KW - Scuffing

KW - Surface roughness

KW - Wettability

UR - http://www.scopus.com/inward/record.url?scp=84948712505&partnerID=8YFLogxK

U2 - 10.1016/j.triboint.2015.04.013

DO - 10.1016/j.triboint.2015.04.013

M3 - Article

VL - 93

SP - 593

EP - 601

JO - Tribology International

JF - Tribology International

SN - 0301-679X

IS - Part B

ER -