高温素材プロセッシング

[2501-10-05] Formation of Titanium Sulfide from Titanium Oxycarbonitride by CS₂ Gas

○Yuta Yashima¹, Eltefat Ahmadi^2,1, Shungo Natsui¹, Tatsuya Kikuchi¹, Ryosuke O. Suzuki¹, Sheikh A. Rezan² (1. Hokkaido University, 2. Universiti Sains Malaysia)

司会：永井 崇（千葉工業大学）

Keywords:Titanium Sulfide, Titanium Nitride, Sulfurization, Oxycarbonitride, Carbon Sulfide

Sulfurization procedure was examined to synthesize titanium sulfide from titanium oxycarbonitride by CS₂ gas. The experiments were carried out at 1173 - 1523 K in a tube reactor with continuously flowing Ar as carrier gas of CS₂. The formation of titanium sulfide phases from the commercial TiN, TiC and TiO powders were studied. Then, TiO_0.02C_0.13N_0.85 coming from ilmenite was sulfurized to prepare single-phase of titanium sulfide. The process was remarkably dependent on the temperature and time. TiN and TiO_0.02C_0.13N_0.85 powders could be fully converted to the single phase of Ti_2.45S₄ (Ti_2+xS₄) at 1473 K in 3.6 ks. The maximum weight gain of TiN sample was ~55.3% indicating a full conversion of TiN to Ti₂S₃ phase. The carbon and oxygen contents in the sulfide prepared from TiO_0.02C_0.13N_0.85 were about 1.77 wt.%C and 1.40 wt.%O, respectively. Therefore, it could be a promising feedstock for the production of cost-affortable titanium powder.