Abstract
The surface coating is one of the novel approaches to enhance the performance and durability of the mechanical components by decreasing the wear and friction among two interacting bodies. In this study, tribological and mechanical properties of titanium nitride (TiN) coatings were investigated on the AISI 52100 bearing steel deposited by low-temperature physical vapor deposition system. Surface morphology and elemental composition of the TiN coating were analyzed by scanning electron microscope and energy-dispersive X-ray spectrum, respectively. Substrate surface roughness and coating thickness of TiN were varied for correlative analysis among adhesion, mechanical, and tribological properties. Scratch and tribo tests were performed for evaluating the adhesion and tribological properties, respectively. Samples having the substrate surface roughness (0.2 ± 0.05 µm) and the coating thickness of more than 2.83 µm presented relatively better adhesion, wear resistance, and lower coefficient of friction of the TiN coating.
Highlights
Friction and wear are considered to be the most important factors for assessing the performance and functionality of the mechanical components
Our results present maximum of 20.81 N adhesion strength of titanium nitride (TiN) coating on AISI 52100 bearing steel substrate at ’ 2.830 mm coating thickness and 130°C deposition temperature
We have demonstrated the values of the mean coefficient of friction (COF) comparable and in some cases even lesser than the conventional high-deposition-temperature TiN physical vapor deposition (PVD) coatings
Summary
Friction and wear are considered to be the most important factors for assessing the performance and functionality of the mechanical components. Besides the substrate surface roughness, the thickness of the coatings is considered to be an important parameter which may affect the tribo-mechanical performance of TiN coatings.[21,22]
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