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    					| Effect of Ti powder activation on preparation of Ti(C,N) powder by carbothermal reduction and nitridation |  
						| XIE Junlong, LI Kaihua, YE Jinwen |  
						| College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China |  
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													    | Abstract  The kinetics and phase evolution of Ti(C,N) formation process by-carbothermal reduction and nitridation of titania (TiO2), carbon and tailing Ti powder as activator were investigated using TG/DSC, XRD. The Kissinger- Akahira-Sunose (KAS) method was used to calculate the activation energies that Ti3O5 reacted to form Ti(C,N) in the system without adding and adding tailing Ti powder, which were (5 053.34±683.64) kJ/mol and (4 485.46±687.33) kJ/mol respectively. The result indicated that tailing Ti could effectively reduce the activation energy of the carbothermal reduction and nitridation reaction; the phase evolution study of the process showed that Ti reacted with TiO2 to form Ti4O7 at 800 ℃, which directly surpassed the TinO2n-1(n>4),a series of intermediate phase transformation process, single-phase Ti(C,N) could be obtained by holding at 1 400 ℃ for 0.5 h; Finally, the oxygen content of 0.34%, the free carbon content of 0.33% and high-quality Ti(C,N) powder with a particle size of 1-2 μm was prepared at 1 750 ℃ for 4 h. |  
															| Received: 18 March 2022
																	    
															    															    															    																	Published: 15 November 2022 |  
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