Bio-based lubricant with additives: tribological performances in hydrodynamic journal bearing
Abstract
Purpose
The purpose of this paper is to investigate the performance of bio-based lubricants (BBL), namely, palm mid-olein (PMO) enriched with an antioxidant agent, tertiary-butylhydroquinone (TBHQ) and a viscosity improver, ethylene-vinyl acetate (EVA), in journal bearing (JB) applications.
Design/methodology/approach
Samples of the BBL were prepared by blending it with TBHQ and EVA at various blending ratios. The oxidative stability (OS) and viscosity of the BBL samples were examined using differential scanning calorimetry and a viscometer, respectively. Meanwhile, their performance in JB applications was evaluated through the use of a JB test rig with a 0.5 length-to-diameter ratio at various operating conditions.
Findings
It was found that the combination of PMO + TBHQ + EVA demonstrated a superior oil film pressure and load-carrying capacity, resulting in a reduced friction coefficient and a smaller attitude angle compared to the use of only PMO or VG68. However, it was observed that the addition of TBHQ and EVA to the PMO did not have a significant impact on the minimum oil film thickness.
Practical implications
The results would be quite useful for researchers generally and designers of bearings in particular.
Originality/value
This study used PMO as the base stock, and its compatibility with TBHQ and EVA was investigated in terms of its OS and viscosity. The performance of this treated BBL was evaluated in a hydrodynamic JB.
Peer review
The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-11-2023-0363/
Keywords
Acknowledgements
This research was supported by the Ministry of Higher Education of Malaysia and Universiti Teknologi Malaysia (UTM) through the Encouragement Research Grant (31J31) and Fundamental Research Grant (23H32).
Credit authorship contribution statement: Amanda Maisarah Norazman and Zulhanafi Paiman: Conceptualization, experimentation, data analysis and writing – original draft. Syahrullail Samion: Supervision, validation and funding acquisition. Muhammad Noor Afiq Witri Muhammad Yazid: Co-supervision, validation and data analysis. Zuraidah Rasep: Reviewing, editing and proofreading.
Declaration of competing interest: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Data availability: Data will be made available on request.
Citation
Norazman, A., Paiman, Z., Samion, S., Muhammad Yazid, M.N.A.W. and Rasep, Z. (2024), "Bio-based lubricant with additives: tribological performances in hydrodynamic journal bearing", Industrial Lubrication and Tribology, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/ILT-11-2023-0363
Publisher
:Emerald Publishing Limited
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