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Materials Science and Engineering of Powder Metallurgy  2022, Vol. 27 Issue (5): 471-477    DOI: 10.19976/j.cnki.43-1448/TF.2022026
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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.
Key wordstailing Ti powder      carbothermal reduction and nitridation      Ti(C      N)      activation energies      phase evolution     
Received: 18 March 2022      Published: 15 November 2022
ZTFLH:  TB332  
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XIE Junlong
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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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