Electromagnetic Wave Absorption and Shielding Performances and Mechanisms of a Porous Ti₃AlC₂/SiC Gradient Composite

Abstract

A porous Ti3AlC2/SiC gradient composite with highly interconnective pores and gradient variation of the Ti3AlC2 content was prepared by the template-replication method. Electromagnetic wave absorption and shielding performances of the as-prepared composite were investigated by the waveguide method in the range of the X-band. It reveals that the complex permittivity and EMW shielding properties of the Ti3AlC2/SiC porous gradient composite increased with increasing sintering temperature from 800 to 1000 °C. Meanwhile, rather than SER, SEA contributed to the EMW shielding effectiveness effectively. The porous composite sintered at 800 °C exhibited the lowest reflection loss of −42.87 dB, while that sintered at 900 °C exhibited the widest effective absorption bandwidth of 3.2 GHz. The porous Ti3AlC2/SiC gradient composite is a more ideal electromagnetic wave absorption and shielding material than the conventional SiC foam.

Construction of 1D Heterogeneous Co/C@Ag Nws With Tunable Electromagnetic Wave Absorption And Shielding Performance

“…Figure presents the performance reported in the literature of materials with both EM waves absorption and EMI shielding performance, and the corresponding data are listed in Table S3 (Supporting Information) of the Supporting Data. As shown in this figure, BiFeO3, [ 35 ] MXene/Ni, [ 36 ] Ti 3 AlC 2 /SiC, [ 37 ] and MnO 2 [ 38 ] composites with a filler loading of 80 wt.%, 50 wt.%, 35 vol.%, and 30 wt.% in the matrix show a minimum reflection loss ( RL min ) of −24.0, −49.9, −42.9, and −10.0 dB with a matching thickness of 6.00, 5.00, 2.00, and 2.75 mm, as well as the corresponding EAB of ≈1.00, 1.50, 1.40, and 0.20 GHz, respectively. Moreover, the above composites also exhibited EMI shielding efficiency of 10.0, 33.8, 30.0, and 23.0 dB, respectively.…”