In situ studies of the lubricant chemistry and frictional properties of perfluoropolyalkyl ethers at a sliding contact

Cheng U Amanda Cheong, Peter C Stair

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

In situ analyses of lubricated sliding contacts were performed by interfacing an ultraviolet Raman spectrometer to a ball-on-flat tribotester. The sliding contact was simulated by rotating a sapphire window that is transparent to ultraviolet radiation against a stationary ball. Various loads were transmitted to the contact center through the ball. A branched perfluoropolyaklyl ether (Krytox 479) and two linear perfluoropolyalkyl ethers (Fomblin 491 and Fomblin 497) have been studied under various loads at a 10 cm/s sliding speed. Krytox and a Fomblin of lower viscosity, Fomblin 497, decomposed to amorphous carbon upon sliding on a chrome steel ball but no amorphous carbon was detected from Fomblin 491. The amount of amorphous carbon at the contact area during sliding was a balance of formation and removal rates. It is postulated that surface activity of the chrome steel ball was the main cause for the lubricant degradation. The lubricant degradation at the chrome steel/sapphire interface was found to slightly increase the kinetic coefficient of friction at the contact center. However, catastrophic scuffing was not observed.

Original languageEnglish
Pages (from-to)117-126
Number of pages10
JournalTribology Letters
Volume10
Issue number1-2
DOIs
Publication statusPublished - 2001

Fingerprint

sliding contact
Ethers
Steel
Amorphous carbon
lubricants
Lubricants
balls
ethers
Aluminum Oxide
chemistry
Sapphire
sliding
chromium
steels
Degradation
carbon
sapphire
Ultraviolet radiation
Ether
Spectrometers

Keywords

  • Coefficient of friction
  • Fomblin
  • Krytox
  • Lubricant chemistry
  • Perfluoropolyalkyl ether
  • UV Raman spectroscopy

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanical Engineering

Cite this

In situ studies of the lubricant chemistry and frictional properties of perfluoropolyalkyl ethers at a sliding contact. / Cheong, Cheng U Amanda; Stair, Peter C.

In: Tribology Letters, Vol. 10, No. 1-2, 2001, p. 117-126.

Research output: Contribution to journalArticle

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