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Influence of temperature on the tribochemical reactions of hexadecane
Author(s) -
Kajdas Czeslaw,
Makowska Monika,
Gradkowski Marian
Publication year - 2003
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.3010150405
Subject(s) - hexadecane , decane , x ray photoelectron spectroscopy , chemistry , mass spectrometry , carbide , fourier transform infrared spectroscopy , gas chromatography , chemical reaction , lubrication , chemical engineering , organic chemistry , materials science , chromatography , composite material , engineering
This paper investigates the tribochemical reactions of n‐hexa‐decane proceeding in a tribosystem lubricated by n‐hexadecane at ambient and elevated temperatures. It is hypothesised that, at ambient temperature, reactions are mostly initiated by the mechanical action of the system, and at elevated temperature (200°C) thermochemical reactions should be dominant. An experimental study was performed using a ball‐on‐disc machine with steel‐on‐steel mating elements. To analyse wear tracks, Fourier transform infrared microspectrophotometry (FTIRM) and electron spectroscopy for chemical analysis (ESCA/XPS) were used. To investigate chemical changes in the bulk lubri cant, gas chromatography coupled with mass spectrometry (GC/ MS) was applied. The results provide clear evidence for the hypothesis that two types of oxygenation processes of n‐hexa ‐decane under boundary lubrication conditions should be considered. The first, at ambient temperature, is controlled by the mechanical action and the second is clearly controlled by temperature. The analytical techniques applied gave evidence of the formation of some reaction products from hexadecane under boundary lubrication conditions. These products include compounds having Fe‐O bonding (salts and chelates), carbonyl compounds, and iron carbide.