期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 35, 页码 29950-29957出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b07735
关键词
SiC; hierarchical porous foam; electromagnetic interference shielding; thermal insulation; mechanical property
资金
- National Natural Science Foundation of China [51572062]
- Natural Science Foundation of Heilongjiang Province [B2015002]
- CALT Foundation of Beijing
- Heilongjiang Postdoctoral Scientific Research Developmental Fund [LBH-Q16079, LBH-Q15090]
- Heilongjiang Province Foundation for Returness [LC2016034]
- Wuliande Foundation of Harbin Medical University [WLD-QN1404]
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.cm(3).g(-1) at a frequency of 11 GHz at 25-600 degrees 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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