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.
谢军龙, 李开华, 叶金文. Ti粉活化对碳热还原氮化法制备Ti(C,N)粉末的影响[J]. 粉末冶金材料科学与工程, 2022, 27(5): 471-477.
XIE Junlong, LI Kaihua, YE Jinwen. Effect of Ti powder activation on preparation of Ti(C,N) powder by carbothermal reduction and nitridation. Materials Science and Engineering of Powder Metallurgy, 2022, 27(5): 471-477.
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