Abstract
In this study, the effect of nano-TiN layer obtained by PVD method on tribological behaviour of X210Cr12 (1.2080, AISI D3) cold work tool steel was investigated. Coating process was carried out by cathodic-arc PVD method using 200 V voltage, 350 °C temperature, 4x10-4 mbar pressure, and 50 A current application conditions. The characterization of the coating was carried out by FESEM and SEM-EDS analysis. The coated and uncoated samples were subjected to abrasive wear test against to 220 mesh sandpaper under 3 different loads (5, 10, and 20 N). The tests were applied at three different sliding distances (100 m, 200 m, and 600 m) keeping the sliding speed as constant at 2,6 m/s. 
 For uncoated samples, while the applied load increased from 5 N to 20 N, the approximate wear loss increased by 10 and 8.5 times, respectively. The approximate wear loss increased by 2.2 and 12.2 times, respectively in nano-TiN coated samples. When compared to the coated and uncoated samples, the wear loss values obtained in the coated samples at sliding distances of 100 m and 200 m differed greatly from uncoated samples, under same conditions almost 100%. However, when the sliding distance reached 600 m, the gap started to close and the gap decreased to 30%.
Highlights
Thin films are preferred for parts or tool surfaces that are subject to wear and corrosion, and reduce thermal and mechanical loads on the tool by reducing the coefficient of friction between the tool and the workpiece and affecting the thermal flow in the contact zone [1]
Thin films can be formed on metal surfaces by many different methods, such as PVD, CVD, plasma spray, plasma nitridation, ion implantation, and diffusion-based methods [2]
The most important variables affecting the structure of the thin film obtained by PVD method can be listed as the structure of the part to be coated, coating thickness, coating temperature, and application pressure [2], [3], [4]
Summary
Thin films are preferred for parts or tool surfaces that are subject to wear and corrosion, and reduce thermal and mechanical loads on the tool by reducing the coefficient of friction between the tool and the workpiece and affecting the thermal flow in the contact zone [1]. It can be as various combinations of these ((TiAl)N and Ti(C, N)), and multilayer compositions (TiC/Al2O3/TiN), [5] Since it has a combination of high hardness, very good thermal and chemical resists, titanium nitride (TiN) coatings are most commonly applied especially for coating of tools by PVD [5,6,7,8]. The acceleration of the researches on nanotechnology and obtained extraordinary features it provides, are increased the capacity of the machinery-manufacturing sector to meet specific requirements in that subject in the world These requirements include increasing the resistance of the products against chemical and physical environment and loading conditions, making them more environmentally compatible and longer lasting, and increasing their quality properties. This study investigated the abrasive wear behaviour of nano-TiN coated by cathodic-arc PVD method on X210Cr12 (1.2080, AISI D3) cold work tool steel. Characterization of coated and uncoated samples was performed by FESEM and SEM-EDS analysis
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