Electromagnetic shielding properties of carbon‐rich chemical vapor infiltration‐prone silicon carbide matrix composites

Abstract This study focuses on the electromagnetic interference shielding effectiveness ( EMI SE ) of SiC nanowire/SiC ceramic composites (SiC nw /SiC) manufactured by chemical vapor infiltration of SiC nw aerogels with carbon‐rich SiC. The total EMI SE of a 1.0 mm thick ceramic composite specimen with density of only 2.68 g/cm 3 , was found to be 43‐44 dB , which indicates an excellent EM shielding capability of the ceramic composite corresponding to blocking of 99.99% of the incident EM signal. It was found that the carbon‐rich CVI ‐SiC matrix possess excellent EM shielding properties, therefore, the CVI ‐SiC CMC s themselves possess an excellent EM shielding property as a result of the carbon‐rich SiC matrix.