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

Abstract

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.

A Self-Powered High-Responsivity, Fast-Response-Speed Solar-Blind Ultraviolet Photodetector Based on CuO/β-Ga2O3 Heterojunction with Built-In Potential Control

“…First, the adhesion between CuO and the Ag film was affected by the rough surface morphology of the CuO film induced by increasing the postannealing temperature. A rough film surface has a lower bonding strength than a smooth and homogeneous film [34]. Second, the film adhesion decreased, owing to the different thermal stresses of the Ag and CuO films.…”

“…The value of R on increases with the postannealing temperature, which is related to the condition of the interface between the Ag electrode and the CuO film. The low adhesion and interfacial defects were caused by the surface roughness of the CuO film caused by the excessive annealing temperature and different thermal stresses of the Ag electrode and CuO film [34,35]. These defects and low stability in the film interfaces can capture or restrain the movement of charge carriers, increasing the resistance [40].…”

Thin TiN coating on NiTi substrate through PVD method: Improvement of the wear resistance

“…There was a reduction in applied force at the end of the curves, especially for the TN1 coating. This phenomenon can be attributed to the complete coating removal from the sample [14]. Figure 6 indicates that the failure of the TN1 coating occurred at a lower critical load (50 μN) compared to the TN2 sample (90 μN).…”

“…Because of the favourable characteristics of Titanium nitride (TiN), such as its high hardness, high corrosion resistance and excellent wear resistance, it exhibits excellent tribological properties; therefore, TiN films have been studied as a coating in recent decades [9,10]. TiN coatings have been applied to dental instruments [11,12], steel [13,14], Ti and Ti alloys [15,16] to improve their properties.…”

Measurement of Interfacial Adhesion Force with a 3D-Printed Fiber-Tip Microforce Sensor

“…Under general environmental conditions, the joint contributions of the capillary force, the electrostatic attractive force, hydrogen bonding and the van der Waals force constitutes the adhesion force [ 4 , 5 , 6 ]. Study of the adhesion forces and their molecular dynamics at interfaces is highly important in various fields, including materials science [ 7 , 8 , 9 ], biomedicine [ 10 , 11 , 12 ], aerospace [ 13 ], and micromechanics [ 14 , 15 ]. For example, adhesion can determine cell differentiation or enable a gecko to crawl easily on a smooth glass plate [ 16 , 17 , 18 ].…”