Title: Improving the wear resistance of vehicle gear oil by oil soluble LaF₃ nanoparticles and typical additives of gear oil

Authors: Di Hou; Haibo Wu

Addresses: School of Automotive Engineering, Hunan Electrical Polytechnic, Xiangtan Hunan, 411101, China ' Department of Mechanical Engineering, Ma'anshan Technical College, Ma'anshan, 243041, China

Abstract: This study aims to explore the synergistic effect of oil soluble LaF₃ nanoparticles and typical gear oil additives on the anti-wear performance of vehicle gear oil. The effects of three additives, namely sulphurised olefin (T321), sulphurised phosphoric acid replicating ammonium salt (T307), and top-level isooctyl phosphate dodecyl ammonium salt (T308B), on the wear resistance of gear oil were evaluated by measuring key indicators such as friction coefficient, wear spot diameter, and maximum non-seizure load. Furthermore, the composite effect of oil soluble LaF₃ nanoparticles with these additives was further studied. The results showed that T308B additive performed the best in reducing friction coefficient and wear spot diameter, while significantly increasing the maximum non-seizure load. Therefore, this study provides experimental basis and theoretical guidance for the development of efficient anti-wear gear oil.

Keywords: oil soluble LaF₃ nanoparticles; gear oil; typical additives; vehicle gears; wear resistance.

DOI: 10.1504/IJMMP.2025.150842

International Journal of Microstructure and Materials Properties, 2025 Vol.18 No.3, pp.139 - 150

Received: 03 Jun 2024
Accepted: 04 Dec 2024
Published online: 24 Dec 2025 *

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