Enhanced dielectric and electromagnetic interference shielding properties of FeSiAl/Al2O3 ceramics by plasma spraying

摘要

FeSiAl/Al2O3 ceramics with flaky metallic FeSiAl were fabricated by low power plasma spraying. High complex permittivity of the flaky FeSiAl/Al2O3 ceramics can be obtained in the X-band due to the larger internal boundary layer capacitance and conductive network. The reflection loss (RL) values less than -7 dB (larger than 80% absorption) can be obtained in the whole X-band for the FeSiAl/Al2O3 ceramics with 20 wt% FeSiAl and a thickness of 1.18 mm. The total electromagnetic interference (EMI) shielding effectiveness is over 36 dB in the whole X-band for the FeSiAl/Al2O3 ceramics with 40 wt% FeSiAl and a thickness of 2 mm. These results indicated that such ceramics with conductive networks and high complex permittivity can be used to produce effective shielding materials for EM application. (C) 2015 Elsevier B.V. All rights reserved.