| Transition metal nitride cluster have developed rapidly in the last twenty decades. TiN film was the earliest horniess film,and the second one was CrN_x film.Due to their excellent properties,such as their high hardness,wear-resisting,chemical inertness with corrosive resistance and thermal stability.TiN films and CrN_x films have found several important applications in cutting tools,die mold,decoration,microelectronics, biotechnology field and so on.For this study,TiN films and CrN_x films were prepared by Arc Ion Plating method on stainless steel and 45 steel substrates.Micro-hardness,surface roughness and adehesion strength of TiN films were compared with those of CrN_x films.Effect of parameter including velocity,load and Counterpart on tribological properties of TiN films and CrN_x films.The wear resistance of TiN films and CrN_x films were studied in different tribological conditions(in dry,water and oil lubricated) by the ball—disk wear tester.The results showed that tribological properties of TiN films were effected obviously by the friction velocity,load and Counterpart.But the tribological properties of CrN_x films were little effected by courterpart.It was verified that TiN films present abrasive pxidized wear under dry friction,fatigue wear with water's boundery lubrication under water lubricating condition and almost no wear because of oil's fluidic lubricability under oil lubricating condition.Tribological mechanism of CrN_x films were abrasion in dry,corrosion in water and little wear in oil.both the grinding crack depth and friction coefficient of TiN films and CrN_x films clearly tend to decrease under water/oil lubricating conditions in comparison under dry friction.But CrN_x films possess much better wear ressistance than TiN films under all conditions.So CrN_x films is thus a potential candidate for replacing TiN in certain applications. |
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