高温素材プロセッシング

[2501-10-05] CS₂ガスを用いた酸炭窒化チタンからの硫化チタン製造法

○八島 悠太¹、アフマディ エルテファト^2,1、夏井 俊悟¹、菊地 竜也¹、鈴木 亮輔¹、レザン シャイフ² (1. 北海道大学、2. マレーシアサインズ大学)

司会：永井 崇（千葉工業大学）

キーワード：硫化チタン、窒化チタン、硫化、酸炭窒化物、二硫化炭素

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.