Abstract
AbstractCarbon fibers reinforced Si3N4 composites with SiC nanofiber interphase (Cf/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°C‐800°C of Cf/SiCNFs/Si3N4 composites were investigated. Results show that SiC nanofibers are combined well with Si3N4 matrix and carbon fibers, the fracture toughness is thus increased more than double from 3.51 MPa·m1/2 of the Si3N4 ceramic to 7.23 MPa·m1/2 of the as‐prepared composites. As the temperature increases from 25°C to 800°C, Cf/SiCNFs/Si3N4 composites show a temperature‐dependent complex permittivity, attenuation constant, and impedance. The relatively high attenuation capability of Cf/SiCNFs/Si3N4 composites at elevated temperature results in a great minimum reflection loss of −20.3 dB at 800°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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