材料科学
复合材料
多孔性
保温
热导率
电磁屏蔽
陶瓷
电磁干扰
碳化硅
电磁干扰
电子工程
图层(电子)
工程类
作者
Caiyun Liang,Zhenfeng Wang,Linzhi Wu,Xiaochen Zhang,Huan Wang,Zhijiang Wang
标识
DOI:10.1021/acsami.7b07735
摘要
A novel light but strong SiC foam with hierarchical porous architecture was fabricated by using dough as raw material via carbonization followed by carbothermal reduction with silicon source. A significant synergistic effect is achieved by embedding meso- and nanopores in a microsized porous skeleton, which endows the SiC foam with high-performance electromagnetic interference (EMI) shielding, thermal insulation, and mechanical properties. The microsized skeleton withstands high stress. The meso- and nanosized pores enhance multiple reflection of the incident electromagnetic waves and elongate the path of heat transfer. For the hierarchical porous SiC foam with 72.8% porosity, EMI shielding can be higher than 20 dB, and specific EMI effectiveness exceeds 24.8 dB·cm3·g–1 at a frequency of 11 GHz at 25–600 °C, which is 3 times higher than that of dense SiC ceramic. The thermal conductivity reaches as low as 0.02 W·m–1·K–1, which is comparable to that of aerogel. The compressive strength is as high as 9.8 MPa. Given the chemical and high-temperature stability of SiC, the fabricated SiC foam is a promising candidate for modern aircraft and automobile applications.
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