XPS analysis of 440C steel surfaces lubricated with perfluoropolyethers under sliding conditions in high vacuum
This work presents the results of the X-Ray Photoelectron Spectroscopy (XPS) analysis of AISI 440C ball surfaces lubricated with perfluoropolyether (PFPE) oils after friction experiments under sliding conditions at high load in air and vacuum environments. The PFPE lubricants tested were Demnum S100, Fomblin Z-25, and Krytox 143AB. It was found that all the PFPE lubricants were degraded by sliding contact causing the formation of inorganic fluorides on the metallic surfaces and a layer of organic decomposition products. KRYTOX 143AB was the least reactive of the three lubricants tested. It was also found that metal fluoride formed at off-scar areas. This suggests the formation of reactive species, such as COF2 or R[sub f]COF, during sliding experiments, which can diffuse through the lubricant film and react with the metallic surfaces away from the contact region. Comparison of reference specimens before sliding with those that had undergone the sliding tests showed that the amount of non-degraded PFPE remaining on the surface of the balls after the sliding experiments was greater than that of the balls without sliding.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
- OSTI ID:
- 7198856
- Report Number(s):
- N-94-30177; NASA-TM-106548; E-8699; NAS-1.15:106548; CNN: RTOP 505-63-5A
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SOLID LUBRICANTS
DECOMPOSITION
STAINLESS STEEL-440
SLIDING FRICTION
POLYETHYLENE GLYCOLS
REACTIVITY
ALCOHOLS
ALLOYS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CORROSION RESISTANT ALLOYS
FRICTION
GLYCOLS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
HYDROXY COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
LUBRICANTS
MARTENSITIC STEELS
MATERIALS
MOLYBDENU
MOLYBDENUM ADDITIONS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYMERS
STAINLESS STEELS
STEEL-CR17MO
STEELS
360103* - Metals & Alloys- Mechanical Properties
360603 - Materials- Properties