2023 Fiscal Year Final Research Report
Development of a Wideband Microwave Absorber - Contributing to the Internet of Things Society Through Dual-phase Engineering
| Project/Area Number |
19H05620
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| Research Category |
Grant-in-Aid for Scientific Research (S)
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| Allocation Type | Single-year Grants |
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| Review Section |
Broad Section D
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
松浦 昌志 東北大学, 工学研究科, 講師 (00633942)
渡邉 雅人 公益財団法人電磁材料研究所, その他部局等, 研究員 (40249975)
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| Project Period (FY) |
2019-06-26 – 2024-03-31
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| Keywords | 電磁波吸収体 / 微粒子 / 透磁率 / 反射損失 / 伝送減衰率 / 二相分離組織 / 飽和磁化 / 保磁力 |
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| Outline of Final Research Achievements |
In this research, we created a modified powder consisting of a dual phase of a soft magnetic phase with high magnetic permeability and a hard magnetic phase with a high anisotropic magnetic field, and aimed to develop a broadband electromagnetic wave absorber that can function in the Early 5G band by controlling the microstructure. We created resin composites consisting of various modified powders by using process technologies based on materials science, such as mechanical mixing, spinodal decomposition, crystallization from amorphous, hydrogen reduction and nitriding, powder coating, and aerosol deposition. These resin composites showed good microwave absorption properties (ex. reflection loss less than -20dB) and good noise suppression effect in the Early 5G band. It suggested that these resin composites from modified powders have a possibility to become an excellent electromagnetic wave absorber, expecting greatly contribution for the creation of an advanced information society.
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| Free Research Field |
磁性材料学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究成果は，デュアルフェーズを基とした材料複合化により，電磁波吸収体における特性向上の可能性を示唆した。中でもFe-Cr-Co系合金におけるスピノーダル分解と塑性加工の利用によって高性能が得られた結果は，世界初の研究となり，新たな材料開発の指針を示した。グラフェンと磁性粉末からなる複合膜における結果も，磁気損失のみで考えていた電磁波吸収特性の制御が，導電損失も含めた制御によって可能であることを示唆し，材料設計の多様化にも貢献した。一方，本研究で開発した種々の電磁波吸収体は，今後の高速通信社会におけるICTデバイスの動作安全性を担保し，安心安全の社会構築に大きく貢献するものと期待される。
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