| Project/Area Number |
11555190
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Metal making engineering
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| Research Institution | Muroran Institute of Technology |
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Principal Investigator |
SHIMAKAGE Kazuyoshi MIT, Faculty of Eng., Professor, 工学部, 教授 (70005346)
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| Co-Investigator(Kenkyū-buntansha) |
UEMURA Yoichiro NIR IM STA, Chief Researcher, 主任研究官
MIURA Yasutaka Showa Kyaboto LTD, Researcher, 開発部研究員
HIRAI Shinji MIT, Faculty of Eng., Associate Professor, 工学部, 助教授 (10208796)
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| Project Period (FY) |
1999 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥13,100,000 (Direct Cost: ¥13,100,000)
Fiscal Year 2001: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2000: ¥4,800,000 (Direct Cost: ¥4,800,000)
Fiscal Year 1999: ¥6,300,000 (Direct Cost: ¥6,300,000)
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| Keywords | Metallic Thermal Reduction / Tantalum Oxide / Mg Reduction / Tantalum Powder / Synthesis Process / Electrical Condennsor / Particle Distribution / Na Reduction / 金属熱還元法 / 酸化タンタル / 粒度分布、 / 比表面積、 / コンデンサー / CVD法 / 五塩化タンタル / 水素還元 / 高容量コンデンサー / プロセス / 開発 |
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| Research Abstract |
Tantalum powder is produced by Na reduction process. However, tantalum powder is cohered each other and its physical property can not be improved by the current production process. From this reason, a new production process of tantalum powder have to be developed by using new raw materials.
In the current investigation, fine tantalum powder has been synthesized by Mg reduction process, in which high purity Ta_2O_5 powder was used as raw materials. In an initial experiment, temperature and time dependences were examined for the production of tantalum powder by the following reduction reaction: Ta_2O_5 (s) + 5Mg(l,g) = 2Ta(s) + 5MgO(s). Mg reduction easily proceeded with an increase in temperature above 900℃. However, specific surface area of tantalum powder prepared was low because tantalum particles were cohered one another. Therefore, iMg reduction of tantalum oxide was carried out at the temperatures of 650℃ and 750℃, and physical properties of tantalum powder synthesized were evaluated by SEM observation, specific surface area measurement and paticle size measurement. As a result, specific surface area of tantalum powder prepared by Mg reduction was more larger than that prepared by Na reduction. Its physical property was improved.
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