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Formation of Titanium Sulfide from Titanium Oxycarbonitride by CS2 Gas

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Title: Formation of Titanium Sulfide from Titanium Oxycarbonitride by CS2 Gas
Authors: Ahmadi, Eltefat Browse this author
Yashima, Yuta Browse this author
Suzuki, Ryosuke O. Browse this author →KAKEN DB
Rezan, Sheikh Abdul Browse this author
Keywords: Titanium sulfide
titanium nitride
Issue Date: Aug-2018
Publisher: Springer
Journal Title: Metallurgical and materials transactions B-process metallurgy and materials processing science
Volume: 49
Issue: 4
Start Page: 1808
End Page: 1821
Publisher DOI: 10.1007/s11663-018-1278-8
Abstract: Previously this group reported that a good quality titanium metal powder can be produced from titanium sulfides by electrochemical OS process. In this study, the sulfurization procedure was examined to synthesize titanium sulfide from titanium oxycarbonitride by CS2 gas. The experiments were carried out in the temperature range of 1173 K to 1523 K (900 A degrees C to 1250 A degrees C) in a tube reactor with continuously flowing argon (Ar) as carrier gas of CS2. The formation of titanium sulfide phases from the commercial TiN, TiC, and TiO powders was studied as the initial step. Then, TiO0.02C0.13N0.85 coming from ilmenite was sulfurized to prepare single phase of titanium sulfide. The products were characterized by X-ray diffraction, and the morphology of the sulfides was rigorously investigated, and the sulfur, oxygen, and carbon contents in the products were analyzed. The process was remarkably dependent on the temperature and time. TiN and TiO0.02C0.13N0.85 powders could be fully converted to the single phase of Ti2.45S4 (Ti2+x S-4) at 1473 K (1200 A degrees C) in 3.6 ks. The maximum weight gain of TiN sample was similar to 55.3 pct indicating a full conversion of TiN to Ti2S3 phase. The carbon and oxygen contents in this sulfide prepared from the oxycarbonitride were about 1.8 wt pct C and 1.4 wt pct O, respectively. Therefore, the titanium sulfide could be a promising feedstock for the production of commercial grade titanium powder.
Rights: This is a post-peer-review, pre-copyedit version of an article published in [Metallurgical and materials transactions B-process metallurgy and materials processing science]. The final authenticated version is available online at:[10.1007/s11663-018-1278-8].
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 鈴木 亮輔

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