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 CMCs themselves possess an excellent EM shielding property as a result of the carbon-rich SiC matrix.aerogel, carbon, chemical vapor infiltration, electromagnetic properties, silicon carbide

Photoluminescence property of inexpensive flexible SiC nanowires membrane by electrospinning and carbothermal reduction

“…7,8 Up to date, many efforts have been devoted to the fabrication of SiC NWs in multiple ways, such as carbothermal reduction, chemical vapor deposition, template growth, pyrolysis of polymeric precursors, sol-gel method, and so on. [9][10][11][12][13][14] Li et al synthesized hexahedral SiC NWs on a graphite paper with carbon felt and SiO 2 by sol-gel and carbothermal reduction, but the synthesized products have high carbon content and low product purity. 15 Zhang et al manufactured SiC NWs by chemical vapor deposition, the method was limited by complex equipment and uncontrollable nanowire morphology.…”

“…SiC NWs may be used as a light‐emitting material and device in a high temperature and severe environment from green to ultraviolet due to the wide direct band gap and excellent performance 7,8 . Up to date, many efforts have been devoted to the fabrication of SiC NWs in multiple ways, such as carbothermal reduction, chemical vapor deposition, template growth, pyrolysis of polymeric precursors, sol‐gel method, and so on 9‐14 . Li et al synthesized hexahedral SiC NWs on a graphite paper with carbon felt and SiO 2 by sol‐gel and carbothermal reduction, but the synthesized products have high carbon content and low product purity 15 .…”

Functional and Structural Facts of Effective Electromagnetic Interference Shielding Materials: A Review

“…Also, owing to this system’s capability to stand high-temperatures, it is useful for high temperature shields, like SiC–C, and Ti 3 AlC 2 nanocomposites . High permittivity of ceramics (perovskite) is eye-catching. , SiC–C, SiC (nanowire), SiC–Si 3 N 4 , and SiC–SiCN are among the reported structural-based EMI shields per the literature. MXenes (2D inorganic materials), having good conductivity (4000 S/m), polarizability, and large surface area, are an emergent categorie of ceramic materials made of a small number of atoms thick 2-layer transition metal carbides, metal carbonitrides, metal nitrides, etc., which presents them as excellent materials for the fabrication of EMI shields. , Per the literature, MXene-based materials have presented SE of ≤24 dB, 50–75 dB, 70 dB, 66–69 dB, etc., within frequencies of 8.2–12.4 GHz.…”

High electromagnetic interference shielding effectiveness in MgO composites reinforced by aligned graphene platelets

“…The materials with 5 vol% graphene exhibit a large tanδ ranging from 0.9 to 1.2. According to previous studies, 35,42,43 materials with good dielectric properties and a dielectric loss tangent are suitable electromagnetic shielding materials. As the graphene embedded in MgO play a crucial role in changing the complex permittivity, these graphene/MgO composites are potential EMI shielding materials in the X-band.…”