Mathematical modelling of sound transmission loss (STL) in metallic and graphite based coatings

Yalcin, Gokhan; Esen, H. Ergin; Yağımlı, Mustafa; Arca, Emin

doi:10.1080/00202967.2021.2023267

Cited by 1 publication

(1 citation statement)

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“…Polymer matrix graphite-filled composites exhibit high electromagnetic shielding efficiency at high frequencies due to the conductive nature of graphite. The high conductivity of graphite enables it to create numerous conductive pathways within the composite material, thereby facilitating the absorption and reflection of electromagnetic radiation [26]. Additionally, the presence of epoxy in the composite material enhances its mechanical and thermal stability, which makes it a suitable candidate for a wide range of applications in various industries [27,28].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Dielectric Properties of Graphite and Carbon Black-Filled Composites as Electromagnetic Interference Shielding Coatings

2023

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The main purpose of electromagnetic interference (EMI) shielding coatings is the insulation of sensitive devices and protect people from electromagnetic field exposure due to its effects on the human body. This paper investigates the dielectric properties, and electromagnetic shielding performances of graphite and carbon black (CB) filled epoxy matrix composites produced by the mechanical mixing method. The sample compositions were created at rates ranging from 1 to 7 wt%. Samples were analyzed by Vector Network Analyzer (VNA) using the coaxial method in the range of 1–14 GHz, including L band, S band, C band, X band and partially Ku band. After determining the scattering parameters with VNA, AC conductivity, absorption, reflection and total shielding efficiency values were calculated. At high frequencies, almost all the samples showed higher AC conductivity. CB-filled samples show higher AC conductivity than graphite-filled samples. The total shielding efficiency (SET) of the graphite-added samples (19–21 dB) is slightly higher than the carbon black-added samples (8–17 dB). Distinct filling ratios in graphite-added samples result in closer shielding behavior in contrast to carbon black-added samples. However, higher shielding efficiency is observed as the CB filler ratio increases. The shielding efficiencies of the samples with both types of filling materials vary little depending on the frequency. Reflection is the main mechanism of the shielding efficiency, which constitutes the majority of total efficiency for all types of samples.

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Section: Introductionmentioning

confidence: 99%