Development of CIP/Graphite Composite Additives for Electromagnetic Wave Absorption Applications

作者：Woo Soobin; Yoo Chan Sei; Kim Hwijun; Lee Mijung; Quevedo Lopez Manuel; Choi Hyunjoo^*

来源：Electronic Materials Letters, 2017, 13(5): 398-405.

DOI：10.1007/s13391-017-7003-y

• electromagnetic wave absorption
• carbonyl iron powder
• graphite
• composites
• ball-milling

In this study, the electromagnetic (EM) wave absorption ability of carbonyl iron powder (CIP)/graphite composites produced by ball milling were studied in a range of 28.5 GHz to examine the effects of the morphology and volume fraction of graphite on EM wave absorption ability. The results indicated that a ball milling technique was effective in exfoliating the graphite and covering it with CIP, thereby markedly increasing the specific surface area of the hybrid powder. The increase in the surface area and hybridization with dielectric loss materials (i.e., graphite) improved EM absorbing properties of CIP in the range of S and X bands. Specifically, the CIP/graphite composite containing 3 wt% graphite exhibited electromagnetic wave absorption of -13 dB at 7 GHz, -21 dB at 5.8 GHz, and -29 dB at 4.3 GHz after 1 h, 8 h, and 16 h of milling, respectively.

• 出版日期2017-9