Search

Purpose: This study aims to improve the tribological performance of Babbitt alloy under oil lubricant condition. Thus, the surface was treated into oleophobic state by modifying with low surface energy fluorosilane (1H,1H,2H,2H-perfluorodecyltriethoxysilane). It is believed that the oleophobic surface offered excellent wear resistance of Babbitt-based tribo-pairs. Design/methodology/approach: By modifying the Babbitt alloy with low surface energy fluorosilane and measuring the oil contact angle, the wetting behavior was evaluated. Using Pin on Disk tribometer, the tribological properties of bare Babbitt and modified Babbitt were quantified. The samples after the friction test were characterized by scanning electron microscope (SEM) and the anti-wear performance was evaluated under dry and oil lubrication conditions. Findings: Results showed that oil contact angle of modified Babbitt was109° which was tripled compared to that of prime surface, which indicates the oleophobic behavior was greatly improved. Under dry conditions, the friction coefficient of the modified surface with different load conditions is slightly lower than that of the bare surface, while the friction coefficient of the modified surface under lubrication conditions is significantly decreased compared to that of the bare surface. Interestingly, under low load and high load, the wear rate of the modified Babbitt alloy surface is only 1/4 and 1/3 of that of the bare surface, respectively. Originality/value: The work proposed an effective method to improve the Babbitt tribological performances and will lighten future ideas for the Babbitt alloy bearing with high wear resistance, which is beneficial to improve the service life of sliding bearings and has huge promotion and application value in the manufacture of sliding bearings. [ABSTRACT FROM AUTHOR]

MXene, a two-dimensional (2D) material consisting of Ti 3 C 2 T x , has demonstrated significant potential for numerous applications, particularly in the areas of corrosion and wear resistance to protect metals. In this study, we reported the facile preparation of MXene/epoxy resin (EP) coatings through blending, which was successfully confirmed by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). With the lubrication of oleic acid (OA), an EP coating containing 1 wt% MXene exhibited superlubricity with a remarkably low coefficient of friction (COF) of 0.008. Furthermore, compared to the pristine substrate, the coating achieved an impressive reduction in the wear rate of 99.73 %. Under simulated seawater conditions, the coating demonstrated an exceptional corrosion protection efficiency (PE) of 99.38 %, which was attributed to the corrosion inhibition effect of MXene. The observed superlow friction was primarily attributed to the synergistic effects of a tribo-film of OA, the presence of the MXene film, and the improved mechanical properties of the EP coating due to the incorporation of MXene. Our study highlighted the potential of MXene as a protective material in long-term marine applications. • Coatings with both wear resistance and corrosion resistance were prepared. • The prepared coatings could enter the superlubricity regime. • MXene in E51 coating effectively improved the corrosion resistance. • Investigated the potential of MXene as a protective material for long-term marine applications. [ABSTRACT FROM AUTHOR]

The maintenance cost of a heavy truck increases due to the severe damage of thrust washer in the differential. The wear was usually related to the contact stress concentration. In the study, the finite element analysis (FEA) was performed for identifying the source of the abnormal wear of thrust washer. An improved approach of modifying the surface profile of spider gear back was proposed. FEA simulations were further conducted to investigate the effect of different spider gear back parameters on the tribological behavior of thrust washer. The FEA simulation results were verified by tribological experiments. Results showed that: (i) the abnormal wear of thrust washer pairing the original gear was caused by the local stress concentration; (ii) the local stress concentration could be eliminated by modifying the surface profile of spider gear back; (iii) using the modified spider gear back, the wear mass loss of the thrust washer was reduced significantly; (iv) the promising surface radius of spider gear back was 73.15 mm. [ABSTRACT FROM AUTHOR]

Nanoparticles are extensively utilized as effective lubrication additives. In a novel approach, one-dimensional nanoparticles undergo self-assembly, transforming into two-dimensional nanochains for use as additives, thereby enabling varied lubrication effects. We involved synthesizing Fe 3 O 4 nanoparticles via a solvothermal method, followed by their self-assembly into magnetic Fe 3 O 4 @SiO 2 nanochains under a magnetic field. These NCs, measuring 57.8 µm in length and 0.2 µm in diameter, were dispersed in deionized water. This study explored the influence of various orientations on the tribological properties of the lubricant through the manipulation of nanochains' alignment using a magnetic field. The results indicate a 48.51% reduction in coefficient of friction and a 73.56% decrease in wear rate when the NCs were aligned perpendicular to the direction of friction. [Display omitted] • Self-assembly forms Fe 3 O 4 @SiO 2 nanochains with good interfacial bonding. • The vertically aligned nanochains greatly reduce the coefficient of friction. • The vertically aligned nanochains act as rolling bearings. • The main forms of wear include adhesive, abrasive, and three-body abrasion. [ABSTRACT FROM AUTHOR]