화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.80, 401-410, December, 2019
DOI10.1016/j.jiec.2019.08.020  Export Citation
Microcellular SiC foams containing in situ grown nanowires for electromagnetic interference shielding
Praveen Wilson, Sujith Vijayan, and K. Prabhakaran†
  • Department of Chemistry, Indian Institute of Space Science and Technology, Thiruvananthapuram 695 547, India
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Microcellular SiC foams (MSiCFs) are produced by thermal setting of dispersions of silicon and NaCl powders in molten sucrose-glycerol solutions in a mould followed by carbonization, NaCl removal and reaction bonding at 1500 °C. The acidic silica layer on silicon particle surface catalyses the setting of the pastes by -OH condensation. The SiC nanowires grown in situ by a catalyst-free vapour-solid (VS) mechanism creates web-like architecture within the microcells (cell size -2 to 22 μm) of the foams. The MSiCFs with porosity in the range of 86.8?91.1 vol.% exhibit thermal conductivity and compressive strength in the ranges of 0.334-0.758 W m-1 K-1 and 0.97-2.38 MPa, respectively. The MSiCFs show excellent electromagnetic interference (EMI) shielding property in the X-band frequency region enhanced by the in situ grown SiC nanowires within microcells. The EMI shielding effectiveness (45.6 dB) and specific shielding effectiveness (137 dB g-1 cm3) are the highest reported for SiC foams.
Keywords:Microcellular;SiC foams;Nanowires;Templating;Reaction bonding;EMI shielding
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