Abstract
The development of PVD coatings on pistons for internal combustion engines is described. The aim is to achieve better control of friction, wear, oxidation and corrosion in critical engine components such as pistons and cylinders in order to achieve higher energy efficiency, prolonged life and improved power output. The aim of the study was to find an optimum substrate–coating combination for aluminium piston applications. PVD CrN arc deposited coatings have been found to offer excellent properties for this application, showing improved friction and wear properties and good adhesion as measured in the scratch test. The coating process has been shown not to affect the hardness or microstructure of the LM-13 piston alloy.
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