Friction and wear properties of TiCN coatings sliding against SiC and steel balls in air and water

Wang, Qianzhi, Zhou, Fei, Chen, Kangmin, Wang, Meiling and Qian, Tao (2010) Friction and wear properties of TiCN coatings sliding against SiC and steel balls in air and water. 5th International Conference on Technological Advances of Thin Films & Surface Coatings, Harbin, China. 10 - 13 Jul 2010.

Abstract

The TiCN coatings were deposited on WC cemented carbides using enhanced cathodic arc magnetron sputtering. The topography of TiCN coatings were observed using scanning electron microscopy (SEM), the composition and structure of TiCN coatings were analysed by energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The friction and wear properties of TiCN coatings sliding against SiC and steel balls in air and water were investigated using ball-on-disk tribometer. The results showed that the TiCN coatings had a strong (111) preferred orientation. The friction coefficient and the specific wear rates of the TiCN/SiC tribopairs in air were higher than those in water under the same conditions. When the TiCN coatings slid against SiC balls in water, the friction coefficient and the specific wear rates first decreased, and then increased with an increase in the normal load, but decreased linearly with sliding velocity. The lowest friction coefficient of 0.171 was obtained at 3N and 0.4m/s, while the lowest specific wear rate of the TiCN coatings was 2.25×10-6mm3/Nm at 6N and 0.1m/s. The TiCN coatings were worn out when the normal loads were higher than 6N. When the TiCN coatings slid against the SUJ2 and SUS440C balls in water, the friction coefficient increased to 0.271 and 1.026 respectively. The EDS analysis showed that Fe and O elements existed on the wear track.This indicated that the tribochemical reaction occurred at the friction contact area.

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