Ti粉活化对碳热还原氮化法制备Ti(C,N)粉末的影响

doi:10.19976/j.cnki.43-1448/TF.2022026

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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 Ti_nO₂_n_-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.

Key words： tailing Ti powder carbothermal reduction and nitridation Ti(C N) activation energies phase evolution

Received: 18 March 2022 Published: 15 November 2022

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	XIE Junlong
	LI Kaihua
	YE Jinwen

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XIE Junlong,LI Kaihua,YE Jinwen. Effect of Ti powder activation on preparation of Ti(C,N) powder by carbothermal reduction and nitridation[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(5): 471-477.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2022026 OR http://pmbjb.csu.edu.cn/EN/Y2022/V27/I5/471

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