Evaluating the oxidation properties of lubricants via non-isothermal thermogravimetric analysis: Estimating induction times and oxidation stability

Applications operating at high temperatures may suffer from oxidative lubricant degradation. The current test methods to evaluate thermoxidative stability and performance are resource intensive and they often provide results that are difficult to extrapolate to application conditions where the tempe...

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Bibliographic Details
Published in:Tribology international 2022-07, Vol.171, p.107569, Article 107569
Main Authors: Smook, Leon A., K. R., Sathwik Chatra, Lugt, Piet M.
Format: Article
Language:English
Subjects:
Antioxidants
Grease
High temperature
Lubricants
Lubrication oils
Oxidation
Oxidative degradation
Performance evaluation
Process parameters
Stability analysis
Thermogravimetric analysis
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Summary:Applications operating at high temperatures may suffer from oxidative lubricant degradation. The current test methods to evaluate thermoxidative stability and performance are resource intensive and they often provide results that are difficult to extrapolate to application conditions where the temperatures are lower than the test temperature. In this paper, we present a method to evaluate the thermoxidative performance of lubricants via non-isothermal thermogravimetric experiments under conditions closer to application conditions. We can provide effective kinetic parameters for the oxidation process. Based on these parameters, we can simulate mass-loss in experiments at a constant temperature, and estimates of induction times of oils with different antioxidant concentrations agree well with experimental values. Additionally, the kinetic parameters may be used in grease life models. [Display omitted] •We propose a non-isothermal method to measure oxidation stability of lubricants.•We extract kinetic parameters for the oxidative degradation of lubricants.•We simulate isothermal oxidation performance of lubricants with these kinetic parameters.•We estimate oxidation induction times with these kinetic parameters.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2022.107569