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The antiwear and extreme pressure action mechanism of CeF 3 in grease
Author(s) -
Yafeng Lain,
Qunji Xue,
Xushou Zhang
Publication year - 1996
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.3010080406
Subject(s) - grease , materials science , lubricant , tribology , thermogravimetry , chemical engineering , x ray photoelectron spectroscopy , composite material , engineering
Cerium (III) fluoride as an antiwear or extreme pressure additive has been used in grease and bonded solid film lubricant, but its action mechanism has not been clarified. In this paper, the tribological characteristics of lithium grease containing CeF 3 , CaF 2 , SbF 3 , CeO 2 and graphite fluoride ((CF) n ) were evaluated with an SRV tester. The results show that pastes containing CaF 2 and (CF) n give good antiwear and anti‐friction performance, but do not possess extreme pressure properties. Adding CeO 2 to grease offers no benefit to the antiwear and anti‐friction performance of the paste. Paste containing SbF 3 has poor lubricating properties. XPS analysis shows that the good antiwear and extreme pressure properties of paste containing CeF 3 can be attributable to the formation of a physically adherent film and a chemical reaction film on the rubbing surface. Thermogravimetry shows that CeF 3 acts as an agent for the slow release of the fluorine element.