Effects of oxidation temperature on microstructure and EMI shielding performance of layered SiC/PyC porous ceramics |
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| Authors: | Yu Pan Yongsheng Liu Mingxi Zhao Ning Wang Chenhao Wang Sujun He Fang Ye Laifei Cheng |
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| Affiliation: | 1. Science and Technology on Scramjet Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, Hunan, 410073, China;2. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi, 710072, China |
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| Abstract: | Herein, the influence of oxidation temperature on the oxidation behavior, microstructure and electromagnetic shielding performance of layered porous ceramics has been systematically investigated. Layered SiC/PyC porous ceramics were prepared by using low-pressure chemical vapor infiltration (LPCVI) method. The oxidized SiC/PyC layered porous ceramics exhibited a negligible mass reduction of 11.94 mg·cm?3, which indicates the excellent high-temperature oxidation resistance of porous ceramics. The electromagnetic shielding performance of SiC/PyC porous ceramics did not exhibit any obvious change even after oxidation at high temperature from 900 to 1300 °C for 10 h. The SET of the layered SiC/PyC porous ceramics was 24.1, 20.0, 19.5, 19.0, 19.8 dB after oxidation at 25 °C, 900 °C, 1000 °C, 1100 °C and 1300 °C, which corresponds to a decrease of 17.01%, 19.09%, 21.16% and 17.84%, respectively. The high-temperature oxidation has rendered a more significant influence on the reflection efficiency of the layered SiC/PyC porous ceramics. |
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| Keywords: | Corresponding author Layered SiC/PyC porous ceramic Low-pressure chemical vapor infiltration Oxidation resistance Electromagnetic shielding effectiveness ANtioxidant properties |
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