Our website is currently undergoing maintenance. Article records and full texts remain available. Submissions can be made through the Editorial Manager.

Preparation and Characterization of Reticulated Porous Mullite Coated with Radar-Absorbing Material

S. Lee, S. Lee, J.-H. Ha, J. Lee, I.-H. Song, B. Park, S. B. Lee, S.-H. Kwon

Journal of Ceramic Science and Technology, Vol. 11, No. 1 (2020), pp. 62-72

DOI: 10.4416/JCST2019-00076

Download full article (PDF)

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.

Keywords

Reticulated porous ceramics, mullite, carbon, cobalt, radar-absorption properties

View this issue · Article & DOI index