期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 41, 期 11, 页码 5437-5444出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.04.048
关键词
Permittivity; Electromagnetic interference shielding; Polymer derived ceramics; SiC nanowires; 3D printing
资金
- National Natural Science Foundation of China [52072306, 51772246, U1737209]
- Science Foundation of the National Key Laboratory of Science and Technology on Advanced Composites in Special Environments [6142905192509]
- National Science and Technology Major Project [2017-VI-0007-0077]
This study presents 3D printed PDC-SiOC ceramics modified with SiCnw, showing high permittivity in the X-band. The ceramics exhibit strong EMI shielding capabilities, with a certain level of mechanical properties at 900 degrees Celsius.
Effective electromagnetic interference (EMI) shielding requires materials with high permittivity. The current study reports 3D printed polymer-derived SiOC ceramics (PDC) modified with SiC nanowires (SiCnw) exhibiting both high real and imaginary parts of permittivity within X-band. SEM results indicated that a large number of pores and cracks exist in the SiOC, and twinned SiCnw were uniformly grown among them along with the existence of graphite microcrystals when the sintering temperature was 1500 degrees C. The real part of permittivity ranged from 16.6 to 28.9 while the imaginary part from 31.7 to 34.2 in X-band. The EMI total shielding effectiveness (SET) of the ceramics could reach 34.7 dB with absorption loss (SEA) of 29.3 dB and reflection loss (SER) of 5.4 dB. Meanwhile, the 3D printed PDC-SiOC ceramics at 900 degrees C sintering temperature possess certain mechanical properties with the magnitude of compressive strength being 12.57 MPa.
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