Abstract
Nitrogen-doped diamond-like carbon films were deposited on tool steel substrate througha plasma electrolytic technique. These coatings were fabricated using the hydrocarbons containing nitrogen vapor as a nitrogen and source. The formation of films was proved by Raman spectroscopy, X-ray diffraction patterns, and cross-section scanning electron microscopy. According to the results, by increasing the urea content, the highest amount of Raman intensity ratio for graphite/disordered graphite (ID/IG) was obtained 3.57. On the other hand, N-doped DLC, graphite and nitride phases in X-ray diffraction patterns were observed. The N-doped films had better tribological properties because of significant nitride phases and less surface roughness with an optimum amount of 1.229 μm for the sample with 4 wt. % urea. The friction coefficient of films was obtained as about 0.1–0.25. Subsequently, the sample with 4 wt. % urea indicated the maximum wear resistance by 70 m compared with 10 m resistance for the sample with 0 wt. % urea.
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