- The Characteristic Changes of Electromagnetic Wave Absorption in Fe-based Nanocrystalline P/M Sheets Mixed with Ball-Milled Carbon Nanotubes
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Sun-I Kim, Mi-Rae Kim, Keun-Yong Sohn, Won-Wook Park
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J Korean Powder Metall Inst. 2009;16(6):424-430.
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DOI: https://doi.org/10.4150/KPMI.2009.16.6.424
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- Electromagnetic wave energies are consumed in the form of thermal energy, which is mainly caused by magnetic loss, dielectric loss and conductive loss. In this study, CNT was added to the nanocrystalline soft magnetic materials inducing a high magnetic loss, in order to improve the dielectric loss of the EM wave absorption sheet. Generally, the aspect ratio and the dispersion state of CNT can be changed by the pre-ball milling process, which affects the absorbing properties. After the various ball-milling processes, 1wt% of CNTs were mixed with the nanocrystalline Fe_73Si_16B_7Nb_3Cu_1 base powder, and then further processed to make EM absorption sheets. As a result, the addition of CNT to Fe-based nanocrystalline materials improved the absorption properties. However, the increase of ball-milling time for more than 1h was not desirable for the powder mixture, because the ballmilling caused the shortening of CNT length and the agglomeration of the CNT flakes.
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Citations
Citations to this article as recorded by  - Annealing effect on microstructure and magnetic properties of flake-shaped agglomerates of Ni–20wt%Fe nanopowder
Geon-Yong Lee, Sang-Kyun Kwon, Jai-Sung Lee
Journal of Alloys and Compounds.2014; 613: 164. CrossRef
- Electromagnetic Wave Absorption Properties of Fe73Si16B7Nb3Cu1-Based Nanocrystalline Soft Magnetic Powder Composite Mixed with Charcoal Powder
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Sun-I Kim, Mi-Rae Kim, Keun-Yong Sohn, Won-Wook Park
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J Korean Powder Metall Inst. 2009;16(4):291-295.
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DOI: https://doi.org/10.4150/KPMI.2009.16.4.291
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- The electromagnetic wave absorption sheets were fabricated by mixing of Fe_73Si_16B_7Nb_3Cu_1 nanocrystalline soft magnetic powder, charcoal powder and polymer based binder. The complex permittivity, complex permeability, and scattering parameter have been measured using a network analyzer in the frequency range of 10 MHzsim10 GHz. The results showed that complex permittivity of sheets was largely dependent on the frequency and the amount of charcoal powder : The permittivity was improved up to 100 MHz, however the value was decreased above 1 GHz. The power loss of electromagnetic wave absorption data showed almost the same tendency as the results of complex permittivity. However, the complex permeability was not largely affected by the frequency, and the values were decreased with the addition of charcoal powder. Based on the results, it can be summarized that the addition of charcoal powder was very effective to improve the EM wave absorption in the frequency range of 10 MHzsim1 GHz.
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Citations
Citations to this article as recorded by - The Characteristic Changes of Electromagnetic Wave Absorption in Fe-based Nanocrystalline P/M Sheets Mixed with Ball-Milled Carbon Nanotubes
Sun-I Kim, Mi-Rae Kim, Keun-Yong Sohn, Won-Wook Park
Journal of Korean Powder Metallurgy Institute.2009; 16(6): 424. CrossRef
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