Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5437520 | Ceramics International | 2017 | 22 Pages |
Abstract
Carbon/ceramic composites are promising candidates as electromagnetic interference (EMI) shielding materials used at various harsh environments. The aim of present work is to prepare and investigate two kinds of composite ceramics reinforced with carbon nanowires (CNWs) and nanowires-nanotubes (CNWs-CNTs) hybrid, respectively. Results indicate that CNWs is highly curved and multi-defected, and CNWs-CNTs hybrid shows the best crystal structure at an optimal catalyst concentration of 5Â wt%. When CNWs accounts for 5.15Â wt%, the total shielding effectiveness (SE) of CNWs/Si3N4 reaches 25.0Â dB with absorbed SE of 21.3Â dB, meaning that 99.7% incident signal can be blocked, while it reaches 25.4Â dB for CNWs-CNTs/Si3N4 as the carbon loading only increasing to 3.91Â wt%. By contrast, CNWs/Si3N4 exhibits better electromagnetic attenuation capability with stronger absorption, mainly due to the unique microstructure of CNWs. Both of two composite ceramics have great potential to be designed as structural and multi-functional materials.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Hongxing Pan, Xiaowei Yin, Jimei Xue, Laifei Cheng, Litong Zhang,