Abstract
Titanium carbonitride (TiCN) coatings were successfully fabricated by reactive plasma spraying (RPS) from agglomerated Ti-graphite feedstock. The effect of Ti particle size on the microstructure and phase composition of plasma sprayed TiCN coatings was investigated. The Vickers microhardness of coatings was measured by a Microhardness Test and the corresponding Weibull distribution were also analyzed. In addition, a pin-on-disk tribometer was employed to determine the trobological properties of coatings. Results show that all the coatings consist of TiCxN1−x (0 ≤ x ≤1) and minor Ti2O phases, and the amount of Ti2O increases with the increase of Ti particle size. The Weibull distribution of Vickers microhardness of all the coatings shows apparent scattering, while the coating sprayed with Ti particle size of 28µm exhibits a relatively even distribution. Compared with the coating sprayed with Ti particle size of 14µm or 48µm, the coating sprayed with Ti particle size of 28µm exhibits improved mechanical and tribological properties, which are attributed to the high microhardness and strong bonding strength.
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