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Titolo:
In situ studies of the lubricant chemistry and frictional properties of perfluoropolyalkyl ethers at a sliding contact
Autore:
Cheong, CUA; Stair, PC;
Indirizzi:
Northwestern Univ, Dept Chem, Evanston, IL 60208 USA Northwestern Univ Evanston IL USA 60208 Dept Chem, Evanston, IL 60208 USA
Titolo Testata:
TRIBOLOGY LETTERS
fascicolo: 1-2, volume: 10, anno: 2001,
pagine: 117 - 126
SICI:
1023-8883(200101/03)10:1-2<117:ISSOTL>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
OXIDATIVE-DEGRADATION REACTIONS; RAY PHOTOELECTRON-SPECTROSCOPY; AMORPHOUS-CARBON FILMS; PERFLUOROALKYL ETHERS; RAMAN-SPECTROSCOPY; TEMPERATURE; SURFACES; SCATTERING; FLUIDS; VACUUM;
Keywords:
UV Raman spectroscopy; lubricant chemistry; perfluoropolyalkyl ether; Krytox; Fomblin; coefficient of friction;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Cheong, CUA Northwestern Univ, Dept Chem, 2145 Sheridan Rd, Evanston, IL 60208 USA Northwestern Univ 2145 Sheridan Rd Evanston IL USA 60208 8 USA
Citazione:
C.U.A. Cheong e P.C. Stair, "In situ studies of the lubricant chemistry and frictional properties of perfluoropolyalkyl ethers at a sliding contact", TRIBOL LETT, 10(1-2), 2001, pp. 117-126

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 thecontact 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.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 12:54:54