Foam structure to improve microwave absorption properties of silicon carbide/carbon material

doi:10.1016/j.jmst.2019.05.060

Abstract

Abstract:

Foam structure materials are well known for their lightweight, efficient, and broadband microwave absorption properties compared to bulk material. However, little has been understood about the effect of a foam structure on the absorption performance of the foam material. In this study, the role of foam structure properties of the silicon carbide/carbon (SiC/C) foam material on microwave absorption is explored using experiment and simulation. We find that the foam structure of SiC/C foam material causes diffraction, multiple reflections, improves the interfacial polarization, and compatibilization. The absorption performance of SiC/C foam material is also studied. The -10 dB effective absorption bandwidth can be adjusted from 4.0 GHz to 18 GHz by tuning SiC/C foam material thickness to 3-7 mm. Therefore, the foam structure design is an effective way to improve the absorption performance of the SiC/C foam material.

Key words: Foam materials, Microwave absorption properties, Structure effects

Li Wanchong, Li Chusen, Lin Lihai, Wang Yan, Zhang Jinsong. Foam structure to improve microwave absorption properties of silicon carbide/carbon material[J]. J. Mater. Sci. Technol., 2019, 35(11): 2658-2664.

Figures/Tables 12

Fig. 1. Simulation models of (a) SiC/C foam material and (b) SiC/C bulk material.

Fig. 2. Optical images of (a) commercial PU foams, (b) impregnated PU foams, (c) SiC/C foam material and (d) SiC/C bulk material.

Table 1 Density and electrical conductivity of the SiC/C material.

Parameter	SiC/C bulk material	SiC/C foam material
		Skeleton	Entirety
Density (g/cm³)	1.96	1.95	0.56
Electrical conductivity (s m^-1)	2.27	2.25	0.63

Fig. 3. Morphologies of (a, c) SiC/C bulk material, (b, d) SiC/C foam material, EDS spectrum of (e) SiC/C bulk material and (f) SiC/C foam material.

Fig. 4. 3D XRT image of SiC/C foam material.

Fig. 5. (a) Backscattered electron images (BEI) of SiC/C bulk material, EPMA of SiC/C foam material showing distribution of elements (b) carbon, (c) silicon, (d) BEI of SiC/C bulk material, EPMA of SiC/C foam material showing distribution of elements (e) carbon, (f) silicon.

Fig. 6. (a) XRD patterns of the SiC/C bulk material; (b) XRD patterns of the SiC/C foam material.

Fig. 7. Frequency dependence of complex permittivity for SiC/C foam material and SiC/C bulk material.

Fig. 8. The frequency dependence of complex permittivity and effective permittivity for SiC/C foam material.

Fig. 9. Electromagnetic wave scatting of (a) SiC/C foam material, (b) SiC/C bulk material, phenomenon of energy regional distribution of (c) SiC/C foam material (d) SiC/C bulk material.

Fig. 10. Reflection loss vs. frequency of SiC/C foam material with different absorber thicknesses.

Fig. 11. Stress-strain curves of the SiC/C foam material.

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