Iranian Journal of Ceramic Science & Engineering
1- Malek Ashtar University of Technology
2- Malek Ashtar University of Technology ,nnshosseini@mut.ac.ir
2- Malek Ashtar University of Technology ,
Abstract: (330 Views)
Diamond-like carbon coatings are widely used to improve the surface properties of alloys due to their excellent mechanical and tribological properties. In this study, diamond-like carbon coatings were created on 4140 steel alloy by ion beam deposition process with two gas sources, methane (CH4) and acetylene (C2H2) with different deposition times. Next, Raman and field emission electron microscopy (FESEM) tests were used to evaluate the structure of the diamond-like carbon coatings. Nano- indentation analysis was also used to investigate the mechanical behavior of the applied coatings. Raman spectroscopy data showed a lower ID/IG ratio and a larger width at half maximum of the G peak for carbon coatings formed with an acetylene gas source. FESEM images of the cross-sections of the created coatings showed a higher deposition rate of the carbon coating with an acetylene gas source. The results of the nanohardness test showed that the diamond-like carbon coating created with the acetylene gas source (C2H2) during the deposition time of 90 minutes had a higher hardness (H) and elastic modulus (E), which were respectively equal to with 20.18 and 188 GPa.
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