Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 103, Issue 12, Pages 6822-6832Publisher
WILEY
DOI: 10.1111/jace.17389
Keywords
C-f; SiCNFs absorbers; high-temperature electromagnetic wave absorption; mechanical properties; Si(3)N(4)ceramics
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Funding
- National Natural Science Foundation of China [51604107]
- Natural Science Foundation of Hunan Province [2019JJ50115, 2019JJ50768]
- Science Research Project of Hunan Provincial Department of Education [19B146]
- State Key Laboratory of Solidification Processing in NPU [SKLSP202021]
- Hunan Key Laboratory of Advanced Fibers and Composites, Central South University [XTXFKT2020-01]
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Carbon fibers reinforced Si(3)N(4)composites with SiC nanofiber interphase (C-f/SiCNFs/Si3N4) were prepared by combining catalysis chemical vapor deposition and gel-casting process. Microstructures, mechanical properties, and electromagnetic wave absorption properties within X-band at 25 degrees C-800 degrees C of C-f/SiCNFs/Si(3)N(4)composites were investigated. Results show that SiC nanofibers are combined well with Si(3)N(4)matrix and carbon fibers, the fracture toughness is thus increased more than double from 3.51 MPa center dot m(1/2)of the Si(3)N(4)ceramic to 7.23 MPa center dot m(1/2)of the as-prepared composites. As the temperature increases from 25 degrees C to 800 degrees C, C-f/SiCNFs/Si(3)N(4)composites show a temperature-dependent complex permittivity, attenuation constant, and impedance. The relatively high attenuation capability of C-f/SiCNFs/Si(3)N(4)composites at elevated temperature results in a great minimum reflection loss of -20.3 dB at 800 degrees C with a thin thickness of 2.0 mm. The superior electromagnetic wave absorption performance mainly originates from conductive loss, multi-reflection, and strong polarization formed by the combined effects of carbon fibers and SiC nanofibers.
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