“…In the same context, Grun [17] reported in his study that a good adhesion for coatings could be obtained when using pulse bias. Ali et al [18] studied the effects of substrate bias; temperature, nitrogen flow rate, and metal ion etching in surface roughness mainly depend on the conditions of sample preparation, surface treatment and other parameters. Akkaya et al [19] have shown in their study the effects of pulse bias in structure and mechanical properties of TiN coatings, that i) the crystal prefers orientation changing from (111) to (220) accompanied by structural transition and ii) there is significant improvement of tribological properties with the application of pulse bias.…”