QI Wenyan, LI Tian, FU Siwei, YE Fang, Guan Sensen, CHEN Shaoyu, ZHANG Xunda

(Tianjin Electric Power Corporation, Electric Power Research Institute, Tianjin 300384, China)

Abstract: The TiCN coatings were successfully prepared by means of reactive plasma with spraying self-made composite powder in the paper. Cane sugar was used as a carbon source, using the means of Precursor body carbon, sucrose and titanium powder mixing at high temperature after the heat treatment furnace for carbonization. Finally the titanium powder was wrapped by the carbon, so the composite powder was mixed more uniform and could react more fully. TiCN coatings could not be synthesized with the composite powder prepared the temperatures of 150 ℃ and 250 ℃, because the sucrose was not carbonized totally and could not carbonize to synthesize TiCN with Ti and N₂ in the process of spraying. TiCN coatings were successfully prepared by spraying the composite powder under heat treatment at 350 ℃ and which composed of Ti and C at a ratio of 1︰3. The phase compositions, the morphologies, the hardness and the microstructures were analyzed. The results showed that TiCN coatings were consisted of TiC_0.2N_0.8 phase and a few of TiN, the wear resistance of TiCN coatings was lower because of the looser structure and the lower hardness.
key words: reactive plasma spray; TiCN coating; microstructure; mechanical properties