2021 Fiscal Year Final Research Report
Process development for design of functional and structural materials through directly applied current sintering method using electric current and field assistance
| Project/Area Number |
19K05098
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 26050:Material processing and microstructure control-related
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| Research Institution | Fukui University of Technology (2020-2021)
Osaka University (2019) |
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Principal Investigator |
Ito Mikio 福井工業大学, 工学部, 教授 (00294033)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | パルス通電焼結 / 通電加熱 / 緻密化 / 局所加熱 / 低消費電力 |
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| Outline of Final Research Achievements |
β-FeSi2 sintered bodies were synthesized by the directly applied current sintering method, and their densification behaviors and thermoelectric properties were compared to those of the samples prepared by the conventional process using a graphite die. The densification was significantly accelerated by this new sintering process, resulting in a densified compact with finer crystal grains. This fine microstructure effectively reduced thermal conductivity, and the figure of merit of the samples was about two times larger than the conventional sample, proving the directly applied current sintering process is quite effective for enhancing thermoelectric performance. In the case of metal powders, which are difficult to obtain the rapid densification phenomenon, rising heating rate is found to cause the local heating effect around interparticle area, leading to the densification acceleration and energy saving sintering.
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| Free Research Field |
材料合成プロセス開発
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| Academic Significance and Societal Importance of the Research Achievements |
直接通電焼結プロセスにより，β-FeSi2焼結体の低温迅速緻密化が可能となることで，従来のSPS焼結では不可能であった微細組織からなる焼結体の合成が可能となり，熱電性能を大幅に向上できた．この効果は，他の熱電材料のみならず，様々な材料において微細組織化を可能にし，それによる機能特性向上に有効であることが期待される．また，緻密化促進効果が得られにくかった金属粉末においても，高速昇温化により緻密化促進およびそれによる高効率焼結が可能となり，本プロセスが広く広範な材料系において適用可能となることを明らかにできたことは，今後の機能・構造材料デザインの可能性を大きく拡大できるものと期待される．
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