Effect Of Substrate Surface Roughness On Adhesion Of Titanium Nitride Coatings Deposited By Physical Vapour Deposition Technique

Medium carbon steel (EN8) substrates with different Surface Roughness (SR) were deposited by Titanium Nitride (TiN). The research work was carried out to investigate the effect of SR and thickness of the thin film coating on substrate structure and tribological properties. EN8 rectangular blocks (60...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2020-12, Vol.981 (4), p.42022
Main Authors: Bhushan, TVSMR, Chandrashekhar, A, Venkat Prasat, S, Rajasri Reddy, I
Format: Article
Language:English
Subjects:
Adhesive strength
Adhesive wear
Coefficient of friction
Machining
Mechanical properties
Medium carbon steels
Morphology
Optical microscopy
Physical vapor deposition
Protective coatings
Scratch tests
Substrates
Surface roughness
Thickness
Thin film coatings
Thin films
Titanium nitride
Traction force
Tribology
Wear mechanisms
Wear resistance
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Summary:Medium carbon steel (EN8) substrates with different Surface Roughness (SR) were deposited by Titanium Nitride (TiN). The research work was carried out to investigate the effect of SR and thickness of the thin film coating on substrate structure and tribological properties. EN8 rectangular blocks (60x10x10mm) were used as substrate materials. The variations in SR were achieved by using emery paper on one side and by machining the other side. Scratch tests were conducted and they showed that TiN coatings on substrate with higher SR (1.2 µm) exhibited less adhesion strength compared to TiN coatings on substrate with a lower SR (0.4 µm). Scratch tests also indicated poor adhesion with an increase in the SR of the substrate. The traction force and Coefficient of Friction (COF) were measured during the dry scratch tests under different normal loads, sliding speeds and ramp load conditions. To examine the morphologies of coated substrates and worn surfaces after the scratch test, optical microscopy was utilized. It was found out that TiN coating with a substrate roughness of 0.4 µm exhibited a lower COF and its wear mechanism was adhesive wear. It was experimentally found out that by decreasing the SR of the substrate coatings, wear resistance could be improved.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/981/4/042022