期刊
CERAMICS INTERNATIONAL
卷 47, 期 22, 页码 31497-31505出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.08.027
关键词
Compressive strength; Microwave absorbing; Heat treatment; SiC network reinforced SiO2 aerogel
资金
- Fundamental Research Funds for the Central Universities [D5000210522, D5000200408]
- Jiangsu Planned Projects for Postdoctoral Research Funds
- National Natural Science Foundation of China [51772151]
- Natural Science Foundation of Shaanxi Province [2021JQ-117]
- Basic Research Programs of Taicang [TC2020JC10]
- Natural Science Foundation of Shandong Province [ZR2020QE180]
The SiC network reinforced SiO2 aerogel composites show significantly enhanced compressive performance with rising temperature, and exhibit efficient electromagnetic absorption capacity after being heated at 900 degrees C, making them promising for applications in complex electromagnetic fields.
Improved compressive strength and preeminent microwave absorbing properties are of great importance to meet the harsh requirements of the thermal environment. Herein, the SiC network reinforced SiO2 aerogel composites were synthesized via the carbonation, chemical vapor deposition, and sol-gel process using melamine sponge as the precursor and carbon foam as the structural template, followed by a heat treatment in the elevated temperature range of 300-1200 degrees C. The results showed that the compressive performance was significantly enhanced as a superior compressive response of 3.46 MPa at 9.49 % strain was obtained owning to the strengthened SiC skeleton wrapped by the SiO2 aerogel with the rising temperature. Besides, the composite after being warmed at 900 degrees C was provided with an efficient electromagnetic absorption capacity with a minimum reflection loss value of -55.38 dB at 16.56 GHz and a maximum effective frequency bandwidth of 8.16 GHz at 4.10 mm, resulting from the optimal attenuation constant as well as superior impedance matching ratio. Given the outstanding compressive strength and microwave absorbing characteristics, the aerogel composite has a good prospect in the complex electromagnetic fields.
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