Tribology performance of polyol-ester based TiO2, SiO2 and their hybrid nanolubricants

Hamisa, Abdul Hamid and Wan Hamzah, Wan Azmi and Mohd Farid, Ismail and Rosminazuin, Ab Rahim and Ali, Hafiz Muhammad (2023) Tribology performance of polyol-ester based TiO2, SiO2 and their hybrid nanolubricants. Lubricants, 11 (18). pp. 1-20. ISSN 2075-4442 (Online). (Published)

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The tribology properties of TiO2/POE, SiO2/POE and TiO2-SiO2/POE nanolubricants were investigated for an automotive air-conditioning system with an electrically-driven compressor (EDC). A two-step preparation method was used in dispersing TiO2 and SiO2 nanoparticles into Polyol-ester (POE)-based lubricant at different volume concentrations of 0.01 to 0.1%. The coefficient of friction (COF) and wear scar diameter (WSD) were investigated using a Koehler four-ball tribo tester and microscopes. For the TiO2/POE, SiO2/POE and TiO2-SiO2/POE nanolubricants, respectively, the lowest COFs with maximum reduction were attained at 37.5%, 33.5% and 31.6% each at volume concentrations of 0.05%, 0.01% and 0.03%. The highest WSD reduction for the TiO2/POE and SiO2/POE mono nanolubricants were attained at 12.5% and 26.4%, respectively, at the same volume concentration of 0.01%. Meanwhile, the maximum reduction of WSD for the TiO2-SiO2/POE hybrid nanolubricant was reached at 12.4% at 0.03% volume concentration. As a conclusion, mono and hybrid nanolubricants with volume concentrations of less than 0.05% are suggested for use in air-conditioning systems with EDC because of their outstanding tribology performances. Further performance investigation of nanolubricants in the air-conditioning system is required to extend the present work.

Item Type: Article
Additional Information: Indexed by Scopus
Uncontrolled Keywords: Coefficient of friction; Four ball tribo tester; Nanolubricants; Polyol-ester; Tribology; Wear scar diameter
Subjects: T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TJ Mechanical engineering and machinery
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Faculty/Division: Institute of Postgraduate Studies
College of Engineering
Faculty of Mechanical and Automotive Engineering Technology
Depositing User: Mr Muhamad Firdaus Janih@Jaini
Date Deposited: 05 Sep 2023 06:53
Last Modified: 05 Sep 2023 06:53
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