NDLI: Reaction of perfluoroalkylpolyethers (pfpe) with 440c steel in vacuum under sliding conditions at room temperature

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Reaction of perfluoroalkylpolyethers (pfpe) with 440c steel in vacuum under sliding conditions at room temperature

Content Provider	NASA Technical Reports Server (NTRS)
Author	Mori, Shigeyuki Morales, Wilfredo
Copyright Year	1989
Description	Reactions of perfluoroalkylpolyethers (PFPE: Fomblin, Demnum and Krytox) were studied during the sliding contact of stainless steel specimens under ultrahigh vacuum conditions. All three fluids reacted with the steel specimens during sliding. Fomblin, which has acetal linkages, decomposed under the sliding conditions generating gaseous products, (COF2 and fluorinated carbons) which were detected by a quadrupole mass spectrometer. Gaseous products were not detected for the Demnum and Krytox fluids. The amount of gaseous products from Fomblin increased with increasing sliding speed. At the end of the sliding experiments, the wear scar and deposits on the specimens were examined by small spot size XPS. The oxide layer on the specimen surface was removed during sliding, and metal fluorides were formed on the worn surface. The surface of the wear scar and deposits were covered with adsorbed PFPE. Based on these results, it was concluded that the decomposition reaction on Fomblin was initiated by contacting the fluid with a fresh metal surface which was formed during sliding.
File Size	2274422
Page Count	11
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19890016720
Archival Resource Key	ark:/13960/t3zs7n937
Language	English
Publisher Date	1989-01-01
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Perfluoro Compounds Polymer Chemistry Metal Surfaces Gas Evolution Wear Alkyl Compounds Polyether Resins Ultrahigh Vacuum Room Temperature Sliding Friction Stainless Steels Vacuum Effects Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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