| Project/Area Number |
18F18054
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 外国 |
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| Research Field |
Metal making/Resorce production engineering
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| Research Institution | Hokkaido University |
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Principal Investigator |
鈴木 亮輔 北海道大学, 工学研究院, 特任教授 (80179275)
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| Co-Investigator(Kenkyū-buntansha) |
AHMADI ELTEFAT 北海道大学, 工学研究院, 外国人特別研究員
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| Project Period (FY) |
2018-10-12 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2020: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 2019: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2018: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | Titanium metal powder / sulfides / oxycarbonitride / ilmenite / molten salt electrolysis / tantalum / Ti metal powder / sulfide / molten salt |
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| Outline of Annual Research Achievements |
A new processing concept for production of Ti metal powder via TiSx (1<x<2) and TiN from ilmenite (FeTiO3) has been proposed. TiN or TiOxCyNz was synthesized by carbothermal reduction and nitridation (CTRN) of FeTiO3.
The preparation of clean TiS2 from TiN plays a key role in production of high-purity Ti powders. Either CS2 or S2 gas could be used for synthesis of titanium sulfides from TiOxCyNz or FeTiO3. However, CS2 gas stream leads to contamination of the samples. A dual-zone furnace specially manufactured gradually evaporated the sulfur and could control the partial pressure of S2 gas. The carbon contamination was remarkably suppressed using S2 gas.
TiN was thus transformed to the single phase of Ti2.45S4 and TiS2 at 1473 K for 3.6 and 10.8 ks, respectively. Nitrogen content of the sulfide was reduced to <0.005 mass% N when the sample was sulfurized at 1473 K for 10.8 ks. Then, the sulfide was reduced to Ti metal powder by the electrochemical OS process in molten CaCl2 with a small addition of CaS. The carbon impurity decreased to 0.01 mass% C for the sulfide and <0.1 mass% C for the Ti powder samples.
Sulfidation of TiC was also studied and pure TiS2 samples with carbon content of <0.025 mass% C were prepared at 1473 K for 18 ks, which is applicable for producing Ti powder. We successfully produced Ti powders with spherical morphology consisted of the foil-like Ti sheets with < 0.15 wt% O from TiN or TiC by the electrochemical reduction in molten CaCl2-0.5 mol% CaS. Using this proposal, Ta and Nb powders could be prepared via their sulfides.
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| Research Progress Status |
令和2年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
令和2年度が最終年度であるため、記入しない。
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