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Preparation and Characterization of Reticulated Porous Mullite Coated with Radar-Absorbing Material
S. Lee1,2, J.-H. Ha1, J. Lee1, I.-H. Song1, B. Park3, S. B. Lee3, S.-H. Kwon2
1 Powder and Ceramics Division, Korea Institute of Materials Science, 797 Changwondaero, Seongsan-gu, Changwon, Gyeongsangnam-do, 51508, Republic of Korea
2 School of Materials Science and Engineering, Pusan National University, 2 Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, Republic of Korea
3 Composites Research Division, Korea Institute of Materials Science, 797 Changwondaero, Seongsan-gu, Changwon, Gyeongsangnam-do, 51508, Republic of Korea
received December 2, 2019, received in revised form February 19, 2020, accepted March 2, 2020
Vol. 11, No. 1, Pages 62-72 DOI: 10.4416/JCST2019-00076
Abstract
Porous ceramics have received much attention because they have excellent thermal and chemical properties. Among the porous ceramics, reticulated porous ceramics (RPCs) have been fabricated for many years. However, as far as the authors know, knowledge of the radar-absorbing properties of RPCs remains insufficient. The authors discussed the feasibility of RPCs, prepared using mullite, as a potential platform that could be coated with a radar-absorbing material (RAM). The results of the experiments in this study were used to determine (1) whether RAM-coated reticulated porous mullite (RPM) could be fabricated with acceptable mechanical strength, and (2) whether RPM could be coated with a RAM while retaining acceptable radar-absorbing properties. Therefore, the structural properties of RPM and the radar-absorption properties of RPM after application of RAM coating were discussed. The compressive strengths of the RPM could be enhanced by controlling the pore densities of commercial polyurethane foams (polymer template) and sintering temperature. The calculated reflection loss (RL) of the 5.74-mm-thick RPM, coated with 10 wt% carbon slurry, approached – 40 dB (99.99 % absorption of radar wave) at 10.0 GHz. The calculated RL of the 17.32-mm-thick RPM, coated with 30 wt% cobalt slurry, approached – 35 dB (99.90 % absorption of the radar wave) at 10.0 GHz.
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Keywords
Reticulated porous ceramics, mullite, carbon, cobalt, radar-absorption properties
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