Measurement of oil film thickness and wear of nanometer scale under pure sliding conditions with ultra-thin film interferometry

Hiroshi Sihomi, Sho Makino, Joichi Sugimura

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1 Citation (Scopus)

Abstract

This paper describes an experimental study on pure sliding elastohydrodynamic point contact between surfaces having nanometer scale roughness. Equations for film thickness of lubricating oil, the gap in static contact and the spacer thickness loss in the ultra-thin film interferometry are derived. Sliding experiments are conducted in which double spacer layers for minimizing wear are employed; both glass disc and convex lens specimens are coated with silica by sputter deposition, Preliminary tests confirm the applicability of the technique under pure sliding conditions where progressive wear occurs, and it is possible to measure oil film thickness and spacer thickness loss simultaneously. The results also show that, in the mixed lubrication regime, the oil film thickness and amount of wear vary under the same sliding velocity, viscosity and temperature. The variation is due to differences in the initial gap, and in turn in the initial surface geometry.

Original languageEnglish
Pages (from-to)818-826
Number of pages9
JournalToraibarojisuto/Journal of Japanese Society of Tribologists
Volume52
Issue number11
Publication statusPublished - 2007

Fingerprint

Ultrathin films
Interferometry
Film thickness
sliding
Oils
interferometry
film thickness
oils
Wear of materials
spacers
thin films
Elastohydrodynamics
Sputter deposition
Lubricating oils
Point contacts
lubricating oils
elastohydrodynamics
Silicon Dioxide
surface geometry
Lubrication

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

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abstract = "This paper describes an experimental study on pure sliding elastohydrodynamic point contact between surfaces having nanometer scale roughness. Equations for film thickness of lubricating oil, the gap in static contact and the spacer thickness loss in the ultra-thin film interferometry are derived. Sliding experiments are conducted in which double spacer layers for minimizing wear are employed; both glass disc and convex lens specimens are coated with silica by sputter deposition, Preliminary tests confirm the applicability of the technique under pure sliding conditions where progressive wear occurs, and it is possible to measure oil film thickness and spacer thickness loss simultaneously. The results also show that, in the mixed lubrication regime, the oil film thickness and amount of wear vary under the same sliding velocity, viscosity and temperature. The variation is due to differences in the initial gap, and in turn in the initial surface geometry.",
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