Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 22, Pages 31561-31566Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.08.035
Keywords
Polymer-derived ceramics (PDCs); SiCN ceramic Aerogels; Structure regulation; Electromagnetic wave absorption properties
Categories
Funding
- National Natural Science Foundation of China [U1904180, 52072344]
- Excellent Young Scientists Fund of Henan Province [202300410369]
- Henan Province University Innovation Talents Support Program [21HAS-TIT001]
- China Postdoctoral Science Foundation [2021M692897]
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In this study, polymer-derived SiCN ceramic aerogels (PDCA-SiCN) were successfully fabricated with a unique three-dimensional network structure by controlling the synthesis temperature and time during the sol-gel process. The sample prepared at 150 degrees C for 20 hours exhibited excellent performance, with a high specific surface area and small pore size.
In the present work, polymer-derived SiCN ceramic aerogels (PDCA-SiCN) were fabricated via a combined solgel/freeze drying/polymer precursor conversion method. The microstructure of PDCA-SiCN was studied by regulating the synthesis temperature and time during the sol-gel process. PDCA-SiCN showed a unique three-dimensional network structure, and the specific surface area and pore size of PDCA-SiCN prepared at 150 degrees C for 20 h were 134 g/m(2) and 18 nm, respectively. To assess the electromagnetic wave absorption (EMA) properties of PDCA-SiCN, the materials were uniformly blended with common paraffin, and the influence of PDCA-SiCN/paraffin ratio on the EMA properties was also investigated. The sample with a PDCA-SiCN/paraffin ratio of 20:80 exhibited the best EMA performance, with a minimum reflection loss (RL) of -43.37 dB at 7.6 GHz and electromagnetic absorption bandwidth of 3.8 GHz, which correspond to an absorption of 99.99 % of the electromagnetic waves. The excellent EMA properties of PDCA-SiCN could be attributed to a synergistic effects of good impedance matching, multiple reflections and high dielectric loss.
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