Microwave Absorbing Properties of Novel SiC/Cf Composites Containing SiC Array Modified Coating

doi:10.15541/jim20200364

Abstract

Abstract:

A novel SiC/C_f composite with SiC array modified coating was prepared by electroless plating combined with high temperature sintering using glucose, Si powder and carbon fiber as raw materials. The phase composition, microstructure and absorbing properties of SiC/C_f composites were characterized by different methods. The results show that the surface of the carbon fiber is coated with a large amount of SiC arrays, which grows outward on the surface of the carbon fiber. The SiC arrays are uniformly distributed and approximately 1.4 μm in height. When the thickness of SiC/C_f composite is about 1-2 mm, with the thickness increasing, the minimum reflection loss (RL_min) moves from high frequency to low frequency. When the absorber thickness is 1.8 mm, the RL_min reaches -40.653 dB at 8.31 GHz and the effective absorption bandwidth (RL < -10 dB) is 1.11 GHz. When the thickness is 1.5 mm, the minimum effective absorption bandwidth can reach 2.42 GHz. Additionally, the RL_min is less than -20 dB when the absorber thickness ranges from 1.3 to 1.8 mm. This new SiC/C_f composite modified by SiC array is expected to be a lightweight and efficient electromagnetic absorbing material.

Key words: carbon fiber, array, SiC, microwave absorbing property

CLC Number:

TB332

WU Zhihong, DENG Yue, MENG Zhenzhen, ZHANG Guoli, ZHANG Luping, WANG Yubin. Microwave Absorbing Properties of Novel SiC/C_f Composites Containing SiC Array Modified Coating[J]. Journal of Inorganic Materials, 2021, 36(3): 306-312.

Figures/Tables 10

Table 1 Basic composition and process conditions of plating solution

Composition	NaH₂PO₂/ ( mol·L^-1)	C₆H₅Na₃O₇·2H₂O/ ( mol·L^-1)	NiSO₄/ ( mol·L^-1)	NH₄Cl/ ( mol·L^-1)	H₂O/mL	Temperature/℃	pH
Process conditions	0.38	0.26	0.15	1.87	200	(90±2)	8-9

Fig. 1 XRD pattern of SiC/Cf composite

Fig. 2 SEM images of SiC/Cf composite (a) SiC tightly wrapped on the Cf; (b) SiC uniformly distributed; (c) SiC orderly arranged and insulated; (d) A few SiC nanowires distributed

Fig. 3 Electromagnetic parameters of SiC/Cf composite (a) Real part (ε′) and imaginary part (ε″) of relative permittivity; (b) Real part (μ′) and imaginary part (μ″) of relative permeability; (c) Dielectric loss tangent (tanδε) and magnetic loss tangent (tanδμ)

Fig. 4 Cole-Cole diagram of SiC/Cf composite

Fig. 5 RL diagrams of SiC/Cf composite material RL value (a), 3D display RL value (b) and 3D RL value projection (c) with a thickness of 1-5.5 mm; RL value with thickness of 1.1-2.0 mm (d)

Fig. 6 Attenuation coefficient (a) and impedance matching (b) diagram of SiC/Cf composite

Table 2 Comparison between SiC/Cf composite and other similar structural materials

Absorbent material	Thickness/mm	RL_min/dB	Frequency/GHz	Effective absorption bandwidth/GHz	Ref.
SiC_NW	3.00	-17.40	11.20	2.50	[29]
SiC_NW/C_f	2.00	-21.50	7.70	2.40	[30]
SiC_NW-C_f/LAS	3.00	-37.80	7.20	<2.00	[31]
ZnO/C_f	4.35	-33.00	-	5.10	[32]
NiZn ferrite/BC	2.00	-11.00	-	-	[33]
HPC/Fe₃O₄	5.50	-20.10	11.76	~2.00	[34]
SiC/C_f	1.50	-25.16	10.38	2.42	This work
SiC/C_f	1.80	-40.66	8.31	1.11	This work

Fig. 7 Comparison with other similar structural materials

Fig. 8 Absorbing mechanism of composite materials

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