Effect of copper nanoparticle concentration on tribological performances of cylinder liner piston ring

Abstract

The performance of cylinder liner piston ring (CLPR) that worked under harsh conditions significantly affected the reliability of diesel engines. Nano‐copper lubricant additives have recently been introduced due to their good anti‐wear properties. This study aims to gain insights into the interactions between concentrations of nano‐copper lubricant additives and the tribological performance of CLPR. Tests are performed on a reciprocating sliding test rig under different operating conditions, and the tribological performances are characterized by the friction coefficient, wear mass losses, and morphologies of worn surface. The experimental results indicated that the optimal concentration of nano‐copper additives is 2 wt%. Additionally, deposition of the Cu nanoparticles on the worn surface during the friction process facilitates the formation of the mending layer. These findings would aid to provide a technical reference for the application of nano‐copper additives in diesel engines.

Insight into the tribological properties of cylinder liner-piston ring under the nano BNNs/Cu composite additive lubrication

“…To comprehensively understand and analyze the tribological properties of nano BNNs/Cu composite, an oleic acid reagent was employed to modify the surface of BNNs/Cu, enhancing its dispersion stability in the base oil. The modification method was based on the literature [24]. Subsequently, various concentrations of powder (including 0.25 wt%, 0.5 wt%, 1 wt%, 2 wt%, and 4 wt%) were uniformly dispersed in 70 N base oil through ultrasonic and magnetic agitation, with base oil devoid of additives serving as the control.…”

“…These parameters were employed to investigate the friction and wear behavior of the cylinder liner-piston ring friction pair. The experiments were conducted within a laboratory setting, with each group lasting for 1 h [24].…”

“…In the realm of soft metal materials, copper nanoparticles are recognized as promising candidates for use as lubricant additives due to their large specific surface area, low melting point, low shear strength, and wide availability [23]. Additionally, based on our previous investigations, the deposition of copper nanoparticles on the worn surface during friction facilitates the formation of a reparative layer [24]. Furthermore, the tribological characteristics of h-BN/Cu composite have been explored by other researchers.…”