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

Abstract

Reducing the energy consumption and exhaust emission, and improving the combustion efficiency of internal combustion engine are important for solving the problems of climate change and environmental pollution. The piston ring-liner system is one of the most serious friction pairs in internal combustion engine, accounting for 26% of the total friction loss. Depositing strengthened coatings on the surface of piston rings is an effective method to reduce the friction coefficient and wear rate. This paper reviews the research progress of several representative technologies for preparing coatings, such as electroplating, physical vapor deposition (PVD), thermal spraying and chemical vapor deposition (CVD), and so on. Various coatings, such as Cr-Al2O3 coating prepared by representative electroplating process, CrN and DLC coatings prepared by physical vapor deposition, and Mo-based and C-based coatings prepared by thermal spraying process, are briefly discussed. Furthermore, the positive and negative aspects of commonly used piston ring coatings are compared, and their development trends are summarized.

Three-Dimensional Design and Prediction of Temperature Distribution of a Partially Ceramic Coated Piston Used in Homogeneous Charge Compression Ignition Engine

“…The results showed that CFD modeling approaches could be trusted and investigated the repercussions of diverse processes, both in detail and on a micro scale. Optimizing combustion is crucial for cutting down on fuel use and exhaust pollution [4]. More research on the consistency of these solutions inside the codes is required to allay concerns about the accuracy of findings, constraints, and dependability of codes.…”

Bionic Design and Optimization of the Wear-Resistant Structure of Piston Rings in Internal Combustion Engines

“…While electroplating coatings introduce pollution during the preparation process, thermal spray coatings tend to deform the piston ring during processing. Environmentally friendly physical vapor deposition (PVD) coatings exhibit superior performance, albeit with higher preparation costs [27]. Redesigning the end face structure to some extent also helps reduce piston ring temperatures, extending their lifespan and enhancing overall performance.…”