The effect of temperature on lubrication property with modtc-containning lubricant -Temperature dependence of friction coefficient and tribofilm structure

Masanori Komaba, Shinya Kondo, Atsushi Suzuki, Kazue Kurihara, Shigeyuki Mori

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The effect of temperature on the lubrication performance of molybdenum dithiocarbamate (MoDTC) was investigated by a ball on disk tribometer with lubricant oil containing MoDTC and calcium sulfonate (CaSU) at temperatures of 25∗C, 40∗C, 60∗C and 80°C. The behavior of friction coefficient was closely dependent on the oil temperature. Friction coefficient decreased after a certain induction period and became to be constant at a steady state. At higher temperature, the induction period became to be shorter, and the slope of decreasing friction coefficient became to be steeper. Friction coefficient at a steady state decreased at higher temperature, and was changed reversibly when the oil temperature was changed. Oscillatory change in friction was observed when the oil temperature was changed periodically. Chemical analysis of the tribofilm with X-ray Photoelectron Spectroscopy (XPS) revealed that higher content of Mo (IV) as a component of molybdenum disulfide (M0S2) observed in the tribofilm formed at higher temperature. Highly oriented M0S2 layer was observed with High Resolution Transmission Electron Microscopy (HR-TEM) in the tribofilm formed at 80"C. It was found that the structure of tribofilm is altered reversibly with oil temperature. A steady state model of tribofilm formation was proposed on the basis of observed results.

Original languageEnglish
Pages (from-to)703-710
Number of pages8
JournalToraibarojisuto/Journal of Japanese Society of Tribologists
Volume62
Issue number11
Publication statusPublished - 2017 Jan 1

Keywords

  • Friction coefficient
  • High resolution transmission electron microscopy
  • Layer structure
  • Molybdenum disulfide
  • Molybdenum dithiocarbamate
  • Temperature dependence
  • Tribochemistry
  • Tribofilm. x-ray photoelectron spectroscopy

ASJC Scopus subject areas

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

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