The impact of Ni and Mo on growth-morphology and mechanical properties of arc evaporated Ti-Cr-N hard coatings

W-Ti-N thin film tribological behaviour for piston skirt properties improvement

“…The reduced grain size of the W-Ti-N film has also a significant effect on the reduction of the friction coefficient [24]. The obtained W-Ti-N thin film revealed much better friction coefficient than the other ternary nitride films such as Ti-Cr-N ( µ = 0.6) [25], Ti-Mo-N ( µ = 0.44) [10], Ti-Zr-N ( µ = 0.25) [26] and Ti-B-N ( µ = 0.2) [8]. The obtained wear rate value of W-Ti-N on stainless steel substrate is W = 2.4·10 −3 mm 3 N −1 m −1 and it increases slightly into W = 2.7·10 −3 mm 3 N −1 m −1 for W-Ti-N on piston skirt substrate.…”

“…Moreover, W-Ti-N on piston skirt substrate wear track width was about 1.5 times narrower than that of the uncoated piston skirt. Comparing the obtained wear rates with other ternary nitride films, shows that they are lower than Ti-Zr-N film (W = 3.4·10 −3 mm 3 N −1 m −1 ) [26], but higher than Ti-B-N (2.9·10 −4 mm 3 N −1 m −1 ) [8] and Ti-Cr–N (1.9·10 −6 mm 3 N −1 m −1 ) [25]. Such higher wear rate can be attributed to the low hardness of the obtained film.…”

Effect of Ar/N2 flow ratio on the microstructure and mechanical properties of Ti-Cr-N coatings deposited by DC magnetron sputtering on AISI D2 tool steels

“…The XRD reflections indicate a presence of binaries nitrides of (Ti 2 N, TiN 0.3 and Cr 2 N) and their reflections are overlapped to a single large peak. This suggests a good solubility of these binaries nitrides as the Ar/N 2 ratio was increased [27]. Furthermore, no peaks referring to the oxide phase were observed by XRD, implying that oxygen could be present in the grain boundaries and/or forming an amorphous oxide phase [28].…”