Abstract
In this work, the friction and wear of a hard TiN/Si3N4 nanocomposite coating in sliding contact with Al2O3 ceramic, 100Cr6 steel, and PTFE polymer balls were analysed. The coating was deposited on Vanadis 23 high-speed steel by a new gas pulsed magnetron sputtering technique. Studies of micromechanical properties indicate very high hardness of the coating equal to 49 GPa with simultaneous very good adhesion to the substrate confirmed in the scratch test. Based on the tribological studies in an unlubricated ball-on-disk contact, the coefficient of friction and specific wear index of the coating and balls were determined. In the friction cooperation, the most advantageous pair of coating and counterpart was an association of TiN/Si3N4 coating with a ceramic Al2O3 ball. In this combination, the wear index of the coating was 5.3·10-6 mm3/Nm, whereas the value of the wear index of the ball was 0.04·10-6 mm3/Nm. According to our investigation, this is the best pair among the tested materials that can be used in friction nodes under a high load. The analysis of the wear mechanism for individual pairs was based on microscopic examination of wear tracks.
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