1116 Effect of atmosphere gas on ultra low friction properties of CNx coating

Effect of Transfer Layer on Ultra Low Friction of CNx Coating under Blowing Dry Ar

“…On the other hand, friction coefficient did not decrease with the increasing of the thickness of transfer layer in the case under ambient gas [3]. These results show the transfer layer from CN x to mating surface has the essential role in the ultra low friction mechanism of CN x .…”

“…Phase transition of CN x coating at sliding contact interfaces Like DLC, CN x is a material with a combination of sp 3 and sp 2 carbon bonds, which the nitrogen substitutes into the sp 2 -bonded ring to a saturation level of about one nitrogen to every three carbon atoms. This CN x structure provides good tribological properties, such as low friction, high hardness, and high wear resistance.…”

“…CN x graphitization occurred when desorption of nitrogen atoms from the CN x matrix was caused by raising the annealing temperature. Generally, the transition temperature of CN x is about 200ºC, which corresponds to a sp 3 -sp 2 transition temperature [8]. However, during sliding, the transition temperature can be decreased to a lower value, due to the high contact stress [9,10].…”

“…8 shows that the phase transition temperature of CN x coatings decreased with an increase of Herztian's contact pressure at the sliding interface. Hence, a high contact pressure results in a lower transition temperature sp 3 -sp 2 of CN x , to as low as 20°C. This explains that the graphitization process possibly occurred under high contact stress at room temperature, since the experiment was performed under room temperature (about 24°C).…”

“…Carbon Nitride (CN x ) is expected as excellent materials with excellent tribological properties. CN x is a hybridized material that is composed of sp 3 and sp 2 Carbon-Nitrogen (C-N) bonding. CN x showed ultra low friction that is less than 0.01 of friction coefficient in dry Nitrogen gas [1].…”