High frequency electromagnetic interference shielding behaviors of Ti3SiC2∕Al2O3 composites

Ti 3 Si C 2 ∕ Al 2 O 3 composites were prepared by hot-pressing sintering process. The dielectric permittivity and electromagnetic interference (EMI) shielding effectiveness (SE) is measured for the composites at the frequency range of 12.4–18GHz (Ku band). The experimental results show that the composites exhibit high complex permittivities at Ku-band frequencies, depending on the Ti3SiC2 content; both the real and imaginary permittivities of the composites increase with the increasing Ti3SiC2 content. The EMI SE of the composite was greatly enhanced with the addition of the Ti3SiC2 filler and increase with the dc conductivity of the composites. The high value of EMI SE shows the potential of the Ti3SiC2∕Al2O3 composite as EMI shielding materials.