ejmse.2025.10.02.125

FLAME RETARDANT MULTILAYER MICROWAVE ABSORBERS BASED ON POWDERED ACTIVATED CHARCOAL

European Journal of Materials Science and Engineering, Volume 10, Issue 2, 2025
PDF Full Article,  DOI: 10.36868/ejmse.2025.10.02.125,   pp. 125-134
Published: June 20, 2025

Olga V. BOIPRAV, 1,*, Vadim A. BOGUSH1
1 Belarusian State University of Informatics and Radioelectronics, Minsk, Belarus.

* Corresponding author: smu@bsuir.by; bogush@bsuir.by

Abstract

The article presents the technology for obtaining flame retardant microwave absorbers based on powdered charcoal. These absorbers include three layers. The outer layer of these absorbers is formed based on a mixture of powdered aluminum oxide or titanium dioxide and a flame retardant paint, the intermediate layer is based on a mixture of powdered activated charcoal impregnated with a calcium or magnesium chloride aqueous solution, and a gypsum aqueous solution, and the inner layer is based on aluminum-containing foiled polymer film. The results of an experimental test of the presented technology are provided. They include the results of a study of the process of interaction of an open flame with absorbers manufactured in accordance with the presented technology, the results of a study of the process of interaction of IR radiation with such absorbers, as well as the results of a study of the electromagnetic radiation absorption characteristics in the frequency range 2.0–17.0 GHz of such absorbers. Using the first of the indicated results, it was confirmed that absorbers manufactured in accordance with the presented technology are flame retardant. Using the second of the indicated results, it was confirmed that absorbers manufactured in accordance with the presented technology provide an effective reduction in the energy of IR radiation. Using the third of the indicated results, patterns of changes in the absorption characteristics of electromagnetic radiation in the frequency range 2.0–17.0 GHz of absorbers manufactured in accordance with the presented technology were established, depending on the composition of their outer and intermediate layers.

Keywords: aluminum oxide, titanium dioxide, microwave absorber, flame retardant.

References:

  1. Zhang, Z. Liu, B. Deng, L. Cai, Y. Dong, X. Zhu, W. Lu, Honeycomb-Like NiCo2O4@MnO2 Nanosheets Array/3D Porous Expanded Graphite Hybrids for High-Performance Microwave Absorber with Hydrophobic and Flame-Retardant Functions, Chemical Engineering Journal, Vol. 419. 129547, 2021, https://doi.org/10.1016/j.cej.2021.129547
  2. Liu, C. Meng, Q. Liu, N. Li, R. Yu, M. Zeng, Fire-Resistant Iron-Based Phosphates / Phosphorus-Doped Carbon Composites Derived from Phytic Acid-Treated Metal Organic Frameworks as High-Efficiency Microwave Absorbers, Carbon, Vol. 200, 2022, pp. 472-482, https://doi.org/10.1016/j.carbon.2022.08.037
  3. Sun, Y. Zhang, Y. Wu, Y. Zhao, M. Zhou, L. Liu, S. Tang, G. Ji, Broadband Absorption of Macro Pyramid Structure Based Flame Retardant Absorbers, Journal of Materials Science & Technology, Vol. 128, 2022, pp. 228-238, https://doi.org/10.1016/j.jmst.2022.04.030
  4. Sun, Y. Zhang, Y. Wu, C. Li, G. Wei, J. Wang, L. Liu, S. Tang, G. Ji, Broadband and High-Efficiency Microwave Absorbers Based on Pyramid Structure, ACS Applied Materials & Interfaces Journal, Vol. 14, Issue 46, 2022, pp. 52182–52192, https://doi.org/10.1021/acsami.2c16166
  5. Bahadir Basyigit, H. Dogan, A. Genc, B. Colak, A New Fire-Resistant Thin Pyramidal Absorber Based Straw and Gypsum Powder for Cost-Effective EMC Test Chambers, Engineering Science and Technology, an International Journal, Vol. 40. 101344, 2023, https://doi.org/10.1016/j.jestch.2023.101344
  6. Wu, G. Wang, S. Shi, X. Liu, J. Liu, J. Zhao, G. Wang. Ni-Carbon Microtube/ Polytetrafluoroethylene as Flexible Electrothermal Microwave Absorbers, Advanced Science, Vo. 10, Issue 31. 2304218, 2023, https://doi.org/10.1002/advs.202304218
  7. Li, L. Zhu, Z. Su, X. Li, W. Yu, J. Liu, C. Lv, Microwave Absorbing Performance and Temperature Resistance of Multifunctional Foamed Ceramics Prepared by the Sintering Method, Ceramics International, Vol. 49, Issue 22, 2023, pp. 34992-35000, https://doi.org/10.1016/j.ceramint.2023.08.173
  8. Zhang, H. Jin, H. Liao, R. Zhang, B. Wang, J. Xiang, C. Mu, K. Zhai, T. Xue, F. Wen, Ultra-Broadband Microwave Absorber and High-Performance Pressure Sensor Based on Aramid Nanofiber, Polypyrrole and Nickel Porous Aerogel, International Journal of Minerals, Metallurgy and Materials, Vol. 31, 2024, pp. 1912-1921, https://doi.org/10.1007/s12613-023-2820-5
  9. I. Penialosa Ovalies, O.V. Boiprav, M.V. Tumilovich, L.M. Lynkou, Electromagnetic Radiation Shielding Composite Coatings Based on Powdered Alumina and Iron Oxides, Doklady BGUIR, Vol. 19, Issue 3, 2021, pp. 104–109, https://doi.org/10.35596/1729-7648-2021-19-3-104-109
  10. Mishra, Analysis of Titanium Dioxide and its Application in Industry, International Journal of Mechanical Engineering and Robotics, Vol. 3, Issue 3, 2014, pp. 561-565, https://doi.org/10.18178/ijmerr
  11. Dasarathan,, J. Sung, M. Ali, J.-W. Park, D. Kim, Non-Flammable Free-Standing TiO2 Nanotubular Hybrid Membrane Prepared by a Two-Step Anodization, Electrochemistry Communications, Vol. 151. 107498, 2023, https://doi.org/10.1016/j.elecom.2023.107498
  12. Ayad, O. Boiprav, L. Lynkou, Electromagnetic Shields Based on Powdered Coal-Containing Materials, Minsk: Bestprint, 2020, 122 p.
  13. Hwang, J. Kim, M. Seol, B. Lee, I.-K. Park, J. Suhr, J.-D. Nam, Quantitative Interpretation of Electromagnetic Interference Shielding Efficiency: Is It Really a Wave Absorber or a Reflector?, ACS Omega, Vol. 7, Issue 5, 2022, pp. 4135–4139, https://doi.org/10.1021/acsomega.1c05657.