Boosting electromagnetic wave absorption of Ti<sub>3</sub>AlC<sub>2</sub> by improving effective electrical conductivity
<p>Electromagnetic wave-absorbing (EMA) materials at high temperatures are limited by poor conduction loss (<italic>L</italic><sub>c</sub>). However, adding conductors simultaneously increases the conduction loss and interfacial polarization loss, leading to a conflict...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Tsinghua University Press
2023-08-01
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| Series: | Journal of Advanced Ceramics |
| Subjects: | |
| Online Access: | https://www.sciopen.com/article/10.26599/JAC.2023.9220770 |
| _version_ | 1797662599507083264 |
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| author | Kai-Yu Guo Lin Chen Guan-Jun Yang |
| author_facet | Kai-Yu Guo Lin Chen Guan-Jun Yang |
| author_sort | Kai-Yu Guo |
| collection | DOAJ |
| description | <p>Electromagnetic wave-absorbing (EMA) materials at high temperatures are limited by poor conduction loss (<italic>L</italic><sub>c</sub>). However, adding conductors simultaneously increases the conduction loss and interfacial polarization loss, leading to a conflict between impedance matching (<italic>Z</italic><sub>in</sub>/<italic>Z</italic><sub>0</sub>) and electromagnetic wave loss. This will prevent electromagnetic waves from entering the EMA materials, finally reducing overall absorbing performance. Here, the effective electrical conductivity (<italic>σ</italic>) is enhanced by synchronizing particle size and grain number of Ti<sub>3</sub>AlC<sub>2</sub> to increase the conduction loss and avoid the conflict between the impedance matching and the electromagnetic wave loss. As a result, the best-absorbing performance with an effective absorption bandwidth (EAB) of 4.8 GHz (10.6–15.4 GHz) at a thickness of only 1.5 mm is realized, which is the best combination of wide absorption bandwidth and small thickness, and the minimum reflection loss (RL<sub>min</sub>) reaches −45.6 dB at 4.1 GHz. In short, this work explores the regulating mechanism of the EMA materials of effective electrical conductivity by simulated calculations using the Vienna <italic>ab-initio</italic> Simulation Package (VASP) and COMSOL as well as a series of experiments, which provide new insight into a rational design of materials with anisotropic electrical conductivity.</p> |
| first_indexed | 2024-03-11T19:02:36Z |
| format | Article |
| id | doaj.art-9429048c0df54650bb5340771dec40e9 |
| institution | Directory Open Access Journal |
| issn | 2226-4108 2227-8508 |
| language | English |
| last_indexed | 2024-03-11T19:02:36Z |
| publishDate | 2023-08-01 |
| publisher | Tsinghua University Press |
| record_format | Article |
| series | Journal of Advanced Ceramics |
| spelling | doaj.art-9429048c0df54650bb5340771dec40e92023-10-10T11:18:12ZengTsinghua University PressJournal of Advanced Ceramics2226-41082227-85082023-08-011281533154610.26599/JAC.2023.9220770Boosting electromagnetic wave absorption of Ti<sub>3</sub>AlC<sub>2</sub> by improving effective electrical conductivityKai-Yu GuoLin ChenGuan-Jun Yang<p>Electromagnetic wave-absorbing (EMA) materials at high temperatures are limited by poor conduction loss (<italic>L</italic><sub>c</sub>). However, adding conductors simultaneously increases the conduction loss and interfacial polarization loss, leading to a conflict between impedance matching (<italic>Z</italic><sub>in</sub>/<italic>Z</italic><sub>0</sub>) and electromagnetic wave loss. This will prevent electromagnetic waves from entering the EMA materials, finally reducing overall absorbing performance. Here, the effective electrical conductivity (<italic>σ</italic>) is enhanced by synchronizing particle size and grain number of Ti<sub>3</sub>AlC<sub>2</sub> to increase the conduction loss and avoid the conflict between the impedance matching and the electromagnetic wave loss. As a result, the best-absorbing performance with an effective absorption bandwidth (EAB) of 4.8 GHz (10.6–15.4 GHz) at a thickness of only 1.5 mm is realized, which is the best combination of wide absorption bandwidth and small thickness, and the minimum reflection loss (RL<sub>min</sub>) reaches −45.6 dB at 4.1 GHz. In short, this work explores the regulating mechanism of the EMA materials of effective electrical conductivity by simulated calculations using the Vienna <italic>ab-initio</italic> Simulation Package (VASP) and COMSOL as well as a series of experiments, which provide new insight into a rational design of materials with anisotropic electrical conductivity.</p>https://www.sciopen.com/article/10.26599/JAC.2023.9220770anisotropic electrical conductivityconduction loss (<italic>l</italic><sub>c</sub>)interfacial polarization loss (<italic>l</italic><sub>ip</sub>)effective electrical conductivityco-optimize impedance matching (<italic>z</italic><sub>in</sub>/<italic>z</italic><sub>0</sub>)electromagnetic wave loss |
| spellingShingle | Kai-Yu Guo Lin Chen Guan-Jun Yang Boosting electromagnetic wave absorption of Ti<sub>3</sub>AlC<sub>2</sub> by improving effective electrical conductivity Journal of Advanced Ceramics anisotropic electrical conductivity conduction loss (<italic>l</italic><sub>c</sub>) interfacial polarization loss (<italic>l</italic><sub>ip</sub>) effective electrical conductivity co-optimize impedance matching (<italic>z</italic><sub>in</sub>/<italic>z</italic><sub>0</sub>) electromagnetic wave loss |
| title | Boosting electromagnetic wave absorption of Ti<sub>3</sub>AlC<sub>2</sub> by improving effective electrical conductivity |
| title_full | Boosting electromagnetic wave absorption of Ti<sub>3</sub>AlC<sub>2</sub> by improving effective electrical conductivity |
| title_fullStr | Boosting electromagnetic wave absorption of Ti<sub>3</sub>AlC<sub>2</sub> by improving effective electrical conductivity |
| title_full_unstemmed | Boosting electromagnetic wave absorption of Ti<sub>3</sub>AlC<sub>2</sub> by improving effective electrical conductivity |
| title_short | Boosting electromagnetic wave absorption of Ti<sub>3</sub>AlC<sub>2</sub> by improving effective electrical conductivity |
| title_sort | boosting electromagnetic wave absorption of ti sub 3 sub alc sub 2 sub by improving effective electrical conductivity |
| topic | anisotropic electrical conductivity conduction loss (<italic>l</italic><sub>c</sub>) interfacial polarization loss (<italic>l</italic><sub>ip</sub>) effective electrical conductivity co-optimize impedance matching (<italic>z</italic><sub>in</sub>/<italic>z</italic><sub>0</sub>) electromagnetic wave loss |
| url | https://www.sciopen.com/article/10.26599/JAC.2023.9220770 |
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