Vacuum tribological behavior of the non-hydrogenated diamond-like carbon coatings against aluminum: Effect of running-in in ambient air

E. Konca; Y. T. Cheng; A. M. Weiner; J. M. Dasch; A. T. Alpas

doi:10.1016/j.wear.2005.02.034

Vacuum tribological behavior of the non-hydrogenated diamond-like carbon coatings against aluminum: Effect of running-in in ambient air

E. Konca, Y. T. Cheng, A. M. Weiner, J. M. Dasch, A. T. Alpas

Research output: Contribution to journal › Article › peer-review

42 Scopus citations

Abstract

Magnetron sputtered non-hydrogenated diamond-like carbon (DLC) coatings have been tested against 319 Al alloy (Al-7% Si) pins in ambient air (52% RH), and under vacuum (1.07 × 10^-2 Pa). When tested at 4.9 N applied load and 0.12 m/s sliding speed, DLC coatings showed high coefficient of friction (COF = 0.52 ± 0.06) and high wear rates (4.05 × 10 ^-4 mm³/m) in vacuum compared to ambient air (COF = 0.16 ± 0.04, wear rate = 4.05 × 10^-4 mm³/m). A very low COF regime (0.006-0.02) was observed under vacuum when the tribopair was first run in ambient air for some sliding distance at the same load. Longer running-in periods and slower sliding speeds in ambient air extended the duration of the subsequent very low COF regime in vacuum. A model that considers the formation of a tribolayer on the counterface during running-in period was proposed. Formation of this tribolayer together with adsorption and dissociation of the atmospheric water on the sliding surfaces were suggested as the possible mechanisms that minimize the COF.

Original language	English
Pages (from-to)	795-799
Number of pages	5
Journal	Wear
Volume	259
Issue number	1-6
DOIs	https://doi.org/10.1016/j.wear.2005.02.034
State	Published - Jul 2005

Bibliographical note

Funding Information:
The authors would like to thank T.A. Perry, C.C. Ang, and M.J. Lukitsch of GM R&D Center (Warren, MI) for valuable discussions. Financial support from NSERC and GM of Canada through the Industrial Chair Program at University of Windsor is gratefully acknowledged.

Keywords

319 Al
DLC
Friction
Pin-on-disc
Transfer
Vacuum

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/j.wear.2005.02.034

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title = "Vacuum tribological behavior of the non-hydrogenated diamond-like carbon coatings against aluminum: Effect of running-in in ambient air",

abstract = "Magnetron sputtered non-hydrogenated diamond-like carbon (DLC) coatings have been tested against 319 Al alloy (Al-7% Si) pins in ambient air (52% RH), and under vacuum (1.07 × 10-2 Pa). When tested at 4.9 N applied load and 0.12 m/s sliding speed, DLC coatings showed high coefficient of friction (COF = 0.52 ± 0.06) and high wear rates (4.05 × 10 -4 mm3/m) in vacuum compared to ambient air (COF = 0.16 ± 0.04, wear rate = 4.05 × 10-4 mm3/m). A very low COF regime (0.006-0.02) was observed under vacuum when the tribopair was first run in ambient air for some sliding distance at the same load. Longer running-in periods and slower sliding speeds in ambient air extended the duration of the subsequent very low COF regime in vacuum. A model that considers the formation of a tribolayer on the counterface during running-in period was proposed. Formation of this tribolayer together with adsorption and dissociation of the atmospheric water on the sliding surfaces were suggested as the possible mechanisms that minimize the COF.",

keywords = "319 Al, DLC, Friction, Pin-on-disc, Transfer, Vacuum",

author = "E. Konca and Cheng, {Y. T.} and Weiner, {A. M.} and Dasch, {J. M.} and Alpas, {A. T.}",

note = "Funding Information: The authors would like to thank T.A. Perry, C.C. Ang, and M.J. Lukitsch of GM R&D Center (Warren, MI) for valuable discussions. Financial support from NSERC and GM of Canada through the Industrial Chair Program at University of Windsor is gratefully acknowledged.",

year = "2005",

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doi = "10.1016/j.wear.2005.02.034",

language = "English",

volume = "259",

pages = "795--799",

number = "1-6",

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TY - JOUR

T1 - Vacuum tribological behavior of the non-hydrogenated diamond-like carbon coatings against aluminum

T2 - Effect of running-in in ambient air

AU - Konca, E.

AU - Cheng, Y. T.

AU - Weiner, A. M.

AU - Dasch, J. M.

AU - Alpas, A. T.

N1 - Funding Information: The authors would like to thank T.A. Perry, C.C. Ang, and M.J. Lukitsch of GM R&D Center (Warren, MI) for valuable discussions. Financial support from NSERC and GM of Canada through the Industrial Chair Program at University of Windsor is gratefully acknowledged.

PY - 2005/7

Y1 - 2005/7

N2 - Magnetron sputtered non-hydrogenated diamond-like carbon (DLC) coatings have been tested against 319 Al alloy (Al-7% Si) pins in ambient air (52% RH), and under vacuum (1.07 × 10-2 Pa). When tested at 4.9 N applied load and 0.12 m/s sliding speed, DLC coatings showed high coefficient of friction (COF = 0.52 ± 0.06) and high wear rates (4.05 × 10 -4 mm3/m) in vacuum compared to ambient air (COF = 0.16 ± 0.04, wear rate = 4.05 × 10-4 mm3/m). A very low COF regime (0.006-0.02) was observed under vacuum when the tribopair was first run in ambient air for some sliding distance at the same load. Longer running-in periods and slower sliding speeds in ambient air extended the duration of the subsequent very low COF regime in vacuum. A model that considers the formation of a tribolayer on the counterface during running-in period was proposed. Formation of this tribolayer together with adsorption and dissociation of the atmospheric water on the sliding surfaces were suggested as the possible mechanisms that minimize the COF.

AB - Magnetron sputtered non-hydrogenated diamond-like carbon (DLC) coatings have been tested against 319 Al alloy (Al-7% Si) pins in ambient air (52% RH), and under vacuum (1.07 × 10-2 Pa). When tested at 4.9 N applied load and 0.12 m/s sliding speed, DLC coatings showed high coefficient of friction (COF = 0.52 ± 0.06) and high wear rates (4.05 × 10 -4 mm3/m) in vacuum compared to ambient air (COF = 0.16 ± 0.04, wear rate = 4.05 × 10-4 mm3/m). A very low COF regime (0.006-0.02) was observed under vacuum when the tribopair was first run in ambient air for some sliding distance at the same load. Longer running-in periods and slower sliding speeds in ambient air extended the duration of the subsequent very low COF regime in vacuum. A model that considers the formation of a tribolayer on the counterface during running-in period was proposed. Formation of this tribolayer together with adsorption and dissociation of the atmospheric water on the sliding surfaces were suggested as the possible mechanisms that minimize the COF.

KW - 319 Al

KW - DLC

KW - Friction

KW - Pin-on-disc

KW - Transfer

KW - Vacuum

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Vacuum tribological behavior of the non-hydrogenated diamond-like carbon coatings against aluminum: Effect of running-in in ambient air

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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