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Volume 08 Research & Reviews: Journal of Engineering and Technology
ISSN: 2319-9873 Automobile Europe 2019
July 08-09, 2019
6th International Conference and Exhibition on
July 08-09, 2019 | Zurich, Switzerland
Automobile & Mechanical Engineering
Friction effect of chromium carbon nitride coating on engine cylinder liner surface
Veli Uysal and Hakan Kaleli
Yıldız Technical University, Turkey
The automotive industry is under great pressure to meet the legislative demands for producing environmentally
friendly vehicles with reduced resource utilisation as well as to satisfy customer demands. In terms of improving
the performance of the engine components and forming very demanding, high strength materials, the contact
surfaces must show reduced friction, anti-adhesive properties and increased wear resistance. Therefore, the
automotive, tool and forming industries are keenly interested in various surface-engineering techniques, especially
hard physical vapour deposition (PVD) coatings. The motivation for the choice of hard coatings is mainly based on
their superior mechanical properties, such as high hardness and excellent galling and wear resistance.Chromium
Carbon Nitride (CrCN) Coating is deposited with PVD method by KAPCO Coating Industry and Trade ltd.
Simulation and measurement of friction and wear were conducted using a reciprocating tribometer. The tribometer
tests were carried out with 1st piston ring rubbing on uncoated and CrCN coated cylinder liner using 5w40 synthetic
engine oil, under boundary lubrication conditions. The liner material is a spheroidal graphite cast iron. Surface
analysis was performed using a 3D digital optical microscope, Scanning Electron Microscope (SEM)/X-Ray and 2D-
3D roughness profilometer. Chromium (Cr) from CrCN coating is well detected on the surface and it is found mixed
with other elements of additives protecting the surface under boundary lubrication conditions. The results indicated
that CrCN protected the cylinder liner worn the piston ring surface. Although the CrCN coating eliminated the wear
of the coated liner, the restricted tribofilm formation and the high coating hardness led to more intense wear of the
piston ring. CrCN coating showed slightly higher friction value between piston ring and coated cylinder liner pairs
related non-coated the end of the tests, while abrasive wear lines-grooves occured on the rubbed surface of
non coated liner, a good protection of wide hills with full of the asperities (of the honed surface) formed on the wear
track of CrCN coated cylinder liner which protected the surface.
Biography
Mechanical Engineer, PhD. Student in Yıldız Technical University.
Veli Uysal et al., JET 2019, Volume 08