Abstract
The chromium nitride coating is a hard coating used to improve the sliding friction and wear behavior and is applied to engine components in various operating conditions even at an elevated temperature. In this study, chromium nitride was deposited by a physical vapor deposition process onto the cast iron substrate. All tribological tests were performed on linear reciprocating tribometer with a stroke length of 5 mm in a dry condition at variable temperature levels of 28 °C, 100 °C, 200 °C, and of 300 °C corresponding to loads of 10 N, 20 N, 30 N, and 40 N against the cylinder liner material. The worn surfaces of chromium nitride(CrN) coatings after friction tests were analyzed by scanning electron microscope (SEM) and energy-dispersive spectroscopy (EDS). The results showed that friction coefficients (COF) ranged from 0.93 to 0.34 from room temperature to 300 °C against the cylinder liner material as a counter-body of 6 mm in diameter; higher temperature results in the positive tribological performance of CrN, with at least 0.34 COF at 300 °C. The wear mechanisms of CrN and counter-body surfaces are abrasive wear accompanied by the slight oxidation. This study guides the wear behavior of cylinder liner coatings in an environment similar to the engine.
Highlights
Thin-film coating is one of the major spheres of influence among the surafce engineering technologies
A counter-face after the wear test at room temperature showed some small grooves and transfer of nitrogen and chromium from the coating reported in Figure 12a; the dominating element is iron as it was before wear test, but the contribution of oxygen increased up to 16.66% by weight
This work presents a study of chromium nitride coating against cylinder liner material at engine operating temperature under reciprocating conditions
Summary
Thin-film coating is one of the major spheres of influence among the surafce engineering technologies. There is a critical need for appropriate solutions regarding the friction and wear behavior of the coated alloys. Different types of wear tester are widely used among the researchers mas per the applications of coatings to identify the triboligical behavior. Materials 2020, 13, 4497 characterized with help of the pin-on-disc, block-on-ring, rubber-wheel, micro-abrasion, and abrasion wear tester. Piston rings and cylinder liner combinations, along with the crankshaft and piston skirt, are primarily accountable for the frictional losses in the engine, which results in major power loss due to the piston ring-cylinder liner system. Hard thin-film coatings with superior tribological behavior are required to meet the challenges of engineering applications [1,2,3]
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