3D carbon network supported porous SiOC ceramics with enhanced microwave absorption properties

doi:10.1016/j.jmst.2020.03.018

Abstract

Abstract:

Porous SiOC ceramic was successfully prepared by pyrolysis of dimethylsilicone oil, silane coupling agent and melamine foam. The microwave absorbing properties of porous SiOC were studied for the first time. At the matching layer thickness of 3.0 mm, the paraffin-based composite with porous SiOC displays a minimum reflection coefficient (RC) of -39.13 dB (11.76 GHz) and an effective absorption bandwidth (EAB) of 4.64 GHz which are much larger than that of paraffin-based composite with ordinary SiOC. It is found that the porous structure of SiOC is crucial to achieve its high microwave absorption performance by improving both the polarization loss and conduction loss. The enhanced polarization loss is originated from the dipole polarization and interfacial polarization, while the improvement of conduction loss is attributed to the carbon skeleton of porous SiOC. These results indicate that porous SiOC ceramic is a promising candidate for high-performance ceramic-based microwave absorbing materials.

Key words: Porous structure, Polarization loss, Conduction loss, Dipole polarization, Interfacial polarization

Chen Chen, Sifan Zeng, Xiaochun Han, Yongqiang Tan, Wanlin Feng, Huahai Shen, Shuming Peng, Haibin Zhang. 3D carbon network supported porous SiOC ceramics with enhanced microwave absorption properties[J]. J. Mater. Sci. Technol., 2020, 54: 223-229.

Figures/Tables 9

Fig. 1. Schematic presentation of the fabrication process of porous SiOC ceramics.

Fig. 2. (a) XRD pattern of porous SiOC ceramic and (b) TG curves of the SiOC porous ceramic and MF-C.

Fig. 3. (a) Raman spectra of porous SiOC and MF-C, (b) C 1s core level spectrum, (c) O 1s core level spectrum and (d) Si 2p core level spectrum of the synthesized porous SiOC.

Fig. 4. (a, b) SEM images of porous SiOC ceramic, (c, d) SEM images of MF, (e, f) SEM images of MF-C and (g-j) EDS mapping of porous SiOC ceramic.

Fig. 5. TEM images and electron diffraction pattern of porous SiOC at low (a) and high (b) magnification.

Fig. 6. Relative complex permittivities of the porous SiOC, ordinary SiOC and MF-C. Frequency dependence of (a) real part, (b) imaginary part, (c) dielectric loss of the porous SiOC, ordinary SiOC, MF-C and (d) typical Cole-Cole semicircles for the porous SiOC in the frequency range of 2-18 GHz.

Fig. 7. Reflection coefficient curves of different layer thickness for (a) MF-C, (b) ordinary SiOC, (c) porous SiOC and (d) minimum reflection coefficient contrast of MF-C, ordinary SiOC and porous SiOC.

Table 1 Comparison of EMA properties of various absorption materials.

Materials	RC_min (dB)	Thickness (mm)	EAB (GHz)	Additive content (wt%)	Matrix	Refs.
Nickel/carbon	-17.8	1.5	4.8(13.2-18)	30	Paraffin	[32]
Co/C crabapples	-26.6	2.0	5.8(12.2-18)	30	Paraffin	[33]
FeCo/porous carbon	-21.7	1.2	5.8(12.2-18)	50	Paraffin	[34]
ZnO nanowires/reduced graphene foams	-27.8	4.8	4.2(8.2-12.4)	3.3	Poly(dimethylsiloxan)	[35]
SiC nanowires/lamellar carbon foams	-31	3.3	4.2(8.2-12.4)	0.8	Epoxy	[36]
Graphene aerogel/carbon fiber	-30.53	1.5	4.1(12.7-16.8)	20	Paraffin	[37]
Porous SiOC	-39.13	3.0	4.64(7.6-12.24)	-	Paraffin	This work

Fig. 8. Schematic illustrations of microwave absorption mechanism of the SiOC porous ceramics.

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