Measurement of oil film thickness and wear of nanometer scale under pure sliding conditions with ultrathin film interferometry

Hiroshi Shiomi, Sho Makino, Joichi Sugimura

Research output: Contribution to journalArticle

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, gap in static contact, and loss of spacer thickness in ultrathin film interferometry are introduced. Sliding experiments are conducted in which double-spacer layers for minimizing wear are used; 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, 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)635-647
Number of pages13
JournalJapanese Journal of Tribology
Volume52
Issue number6
Publication statusPublished - Dec 1 2007

Fingerprint

Ultrathin films
Interferometry
Film thickness
Oils
Wear of materials
Elastohydrodynamics
Sputter deposition
Lubricating oils
Point contacts
Silicon Dioxide
Lubrication
Lenses
Surface roughness
Silica
Viscosity
Glass
Geometry
Experiments
Temperature

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Measurement of oil film thickness and wear of nanometer scale under pure sliding conditions with ultrathin film interferometry. / Shiomi, Hiroshi; Makino, Sho; Sugimura, Joichi.

In: Japanese Journal of Tribology, Vol. 52, No. 6, 01.12.2007, p. 635-647.

Research output: Contribution to journalArticle

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