Browsing by Author "Cakir, Muhammet"

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The Effect of Different Annealing Temperatures on the Mechanical and Tribological Properties of the Ti2aln Max Phase Films
(Sage Publications Inc, 2024) Cakir, Muhammet; Cicek, Hikmet; Duran, Semih; Yilmaz, Ahmet Melik; Gulten, Gokhan; Efeoglu, Ihsan
Ti2AlN MAX phase films produced at different N-2 flow rates and different annealing temperatures were deposited on 52100 steel substrates using the closed-field unbalanced magnetron sputtering technique. N-2 flow rates were changed to 2, 3.5, and 5 sccm. Due to the increasing N-2 flow rate, film thickness decreased from 2 to 1.3 mu m. Then the produced films were subjected to annealing at temperatures of 700, 750, and 800 degrees C. After the film produced at a flow rate of 2 sccm was annealed at 750 degrees C, the presence of the Ti2AlN MAX phase was determined. The binding energies of Ti 2p, Al 2p, and N 1s determined in the XPS analysis confirmed the existence of the Ti2AlN film. The friction coefficient measured for Ti2AlN MAX phase films was calculated as 0.53, the hardness value as 22.8 GPa, the elastic modulus as 291.4 GPa, and the wear rate as 2.96 x 10(-4) mm(3)/(Nm).
Structural and Tribological Properties of TiSin Films with Different Si Content
(Elsevier Science Sa, 2023) Cicek, Hikmet; Acar, Yunus Emre; Duran, Semih; Yilmaz, Ahmet Melik; Cakir, Muhammet
TiSiN thin films were deposited on 52100 steel and Al2024 substrates by magnetron sputtering method using Ti and Si targets in Ar+N2 atmosphere. Power values of 40 W, 60 W, and 75 W were applied to the Si target, while the voltage was constant at 370 V for the Ti target. The Si atomic ratios within the film's structure were found to vary in accordance with the increasing Si target power. The impact of varying Si atomic ratios on the structural, mechanical, and tribological properties of the films was investigated. X-ray diffraction, scanning electron mi-croscopy, hardness and wear test methods were performed. As the Si ratio increased from 10 at. % to 20 at. %, the maximum hardness value was 6.06 GPa for 52100 steel and 4.33 GPa for Al2024. With increasing Si content, the film thickness increased from 1.63 mu m to 2.05 mu m. The lowest surface roughness of the produced films was 0.069 for 52100 steel and 0.308 for Al2024. The lowest wear rate of TiSiN film was calculated at 1.63 x 10-4 mm3/(N.m).