In recent years, Electromagnetic interference (EMI) shielding and absorbing materials, which can effectively prevent the leakage of harmful EM wave, have attracted considerable attention with the increasing applications of electronic devices such as television, computers, mobile telephones and autom...
In recent years, Electromagnetic interference (EMI) shielding and absorbing materials, which can effectively prevent the leakage of harmful EM wave, have attracted considerable attention with the increasing applications of electronic devices such as television, computers, mobile telephones and automobile communication apparatuses, etc., that emit electromagnetic (EM) energy resulting in electromagnetic wave pollution. Typical metals (like copper, aluminum) and their composites possessing high conductivity and dielectric constant are considered to be the best EM shielding materials with high EM shielding effectiveness. But their disadvantages such as heavy weight and easy corrosion restrict their wide use for shielding materials. Now considerable research work focuses on the development of lightweight, chemical stable and high broadband EM shielding effectiveness composite materials. In this study, the electromagnetic interference (EMI) shielding mechanisms of graphite/ABS composites, carbon black/ABS composites, graphite/carbon black/ABS composites were analyzed experimentally and theoretically. For the experimental analysis, electric conductivity and EMI shielding effectiveness (SE) of graphite/ABS composites made in 10wt%, 20wt%, 30wt%, 40wt%, 50wt%, 60wt% contents were studied. Carbon black/ABS composites made in 5wt%, 10wt%, 15wt% contents were studied. Graphite/carbon black/ABS composites made in 10wt%, 20wt%, 30wt%, 40wt% contents were studied. EMI shielding effectiveness test of the composites were performed according to ASTM D4935-89, respectively. Electromagnetic interference shielding efficiency was measured quantitatively to examine the electromagnetic interference shielding characteristics of designed specimens. The range of frequency considered is 30MHz-1,500MHz. In this study, flexural tests of the composites were performed according to ASTM D790-03, respectively. The fracture surface of the composites was also observed using the SEM to understand the interfacial interaction between fillers and matrix. The result of electromagnetic interference shielding experiments indicate that the maximum EMI shielding effectiveness is observed at 60wt% graphite/ABS composite
In recent years, Electromagnetic interference (EMI) shielding and absorbing materials, which can effectively prevent the leakage of harmful EM wave, have attracted considerable attention with the increasing applications of electronic devices such as television, computers, mobile telephones and automobile communication apparatuses, etc., that emit electromagnetic (EM) energy resulting in electromagnetic wave pollution. Typical metals (like copper, aluminum) and their composites possessing high conductivity and dielectric constant are considered to be the best EM shielding materials with high EM shielding effectiveness. But their disadvantages such as heavy weight and easy corrosion restrict their wide use for shielding materials. Now considerable research work focuses on the development of lightweight, chemical stable and high broadband EM shielding effectiveness composite materials. In this study, the electromagnetic interference (EMI) shielding mechanisms of graphite/ABS composites, carbon black/ABS composites, graphite/carbon black/ABS composites were analyzed experimentally and theoretically. For the experimental analysis, electric conductivity and EMI shielding effectiveness (SE) of graphite/ABS composites made in 10wt%, 20wt%, 30wt%, 40wt%, 50wt%, 60wt% contents were studied. Carbon black/ABS composites made in 5wt%, 10wt%, 15wt% contents were studied. Graphite/carbon black/ABS composites made in 10wt%, 20wt%, 30wt%, 40wt% contents were studied. EMI shielding effectiveness test of the composites were performed according to ASTM D4935-89, respectively. Electromagnetic interference shielding efficiency was measured quantitatively to examine the electromagnetic interference shielding characteristics of designed specimens. The range of frequency considered is 30MHz-1,500MHz. In this study, flexural tests of the composites were performed according to ASTM D790-03, respectively. The fracture surface of the composites was also observed using the SEM to understand the interfacial interaction between fillers and matrix. The result of electromagnetic interference shielding experiments indicate that the maximum EMI shielding effectiveness is observed at 60wt% graphite/ABS composite
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#electromagnetic interference shielding
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