Tribological performance of three surface-modified piston rings matched with chromium-plated cylinder liner

Abstract

Purpose The paper aims to investigate the friction and wear properties of three surface-modified piston rings matched with a chromium-plated cylinder liner. Design/methodology/approach Samples were taken from the chromium-plated cylinder liner, Cr-Al2O3 ring, CrN ring and Mo ring. Tribo-tests were conducted on a reciprocating sliding tribometer under fully formulated engine oils. Friction coefficients and wear depths of three friction pairs were tested. Surface morphologies of cylinder liners and piston rings before and after test were analyzed. Findings Experimental results show that in the Cr-Al2O3 piston ring, scuffing occurred easily when matched with the chromium-plated cylinder liner; compared with the Mo ring, the CrN ring could decrease the wear depth of the piston ring from 2.7 to 0.2 μm, and the wear depth of cylinder liner remained; however, the friction coefficient increased from 0.113 to 0.123. The tribological performances of three surface-modified piston rings were significantly different when they matched with chromium-plated cylinder liner. Originality/value Chromium-plated cylinder liner and the three kinds of surface-modified piston rings have excellent friction and wear properties, respectively. However, according to the systematic characteristics of internal combustion (IC) engine tribology, only the appropriate cylinder liner–piston ring can improve the tribological performance of the IC engine. This paper reports the tribological performance of three surface-modified piston rings matched with a chromium-plated cylinder liner. The results can be used as reference for the design of high-power-density diesel engine.

The Effect of Honing Angle and Roughness Height on the Tribological Performance of CuNiCr Iron Liner

“…As the normal load was high, the reciprocating sliding also seemed to be a rolling process, resulting in the plastic flow of material on the edge of the platforms (see Figure 16b). Then, the platforms further deformed plastically due to the increase of the sliding distance, causing the growth of the flakes on the edge, which can be observed in Figure 12f, and the increase of the direct contact between the friction pair, as illustrated in Figure 16c [36]. Subsequently, the flakes debonded from the platforms and became debris.…”

A review on preparation process and tribological performance of coatings for internal combustion engine piston ring

“…The influence factors of load, temperature and speed on the wear loss of piston ring were 58.12%, 16.35%, and 2.19%, respectively. Zhu et al 47 compared the tribological properties of Cr-Al 2 O 3 , CrN, and sprayed Mo coatings deposited on piston rings. The results showed that the Cr-Al 2 O 3 coating was easier to be scratched than other coatings when the piston ring matched with the chromium plated cylinder liner.…”

Friction Performance of Aluminum-Silicon Alloy Cylinder Liner after Chemical Etching and Laser Finishing

“…Conventional chrome-plated, molybdenum-impregnated piston rings exhibit scuffing and severe wear under high power density conditions. The chromium-based ceramic composite plating named Chrom-Keramik-Schicht (CKS) adopts a layer-by-layer deposition method, and the current is periodically commutated, and the ceramic particles, such as Al 2 O 3 , SiC, and TiO 2 , are embedded in the microcracking texture in the chrome plating layer [25][26][27]. The piston ring prepared by the process has outstanding wear resistance and excellent high temperature bearing performance [28,29].…”