Effect of heat treatment temperature on microstructure and electromagnetic shielding properties of graphene/SiBCN composites

doi:10.1016/j.jmst.2019.07.018

Abstract

Abstract:

Three-dimensional (3D) graphene/SiBCN composites (GF/SiBCN) were prepared by depositing SiBCN ceramics in 3D graphene foam via the chemical vapor infiltration technique. The effect of the heat treatment temperature on the microstructure, phase composition, and electromagnetic properties of the GF/SiBCN composite was investigated. The SiBCN ceramics maintained an amorphous structure in the composite below 1400?°C above which the crystallinity of the free carbon phase gradually increased. While the Si₃N₄ and B₄C phases started to crystallize at 1500?°C and their crystallinity increased with temperature, SiC was observed at 1700?°C. The electromagnetic shielding effectiveness of GF/SiBCN increased with the heat treatment temperature.

Key words: Silicon-Boron carbonitride ceramics, Chemical vapor deposition and infiltration, Heat treatment, Electromagnetic shielding effectiveness

, Yongsheng Liu, Mingxi Zhao, Fang Ye, Laifei Cheng. Effect of heat treatment temperature on microstructure and electromagnetic shielding properties of graphene/SiBCN composites[J]. J. Mater. Sci. Technol., 2019, 35(12): 2897-2905.

Figures/Tables 13

Table 1 Weight loss and shrinkage of the GF/SiBCN composite annealed at different temperatures.

Material	Annealing temperature (^oC)	Weight loss rate (%)	Line shrinkage rate (%)	Body shrinkage rate (%)
GF/SiBCN	1400	0.41	0.63	1.80
	1500	0.84	1.23	2.07
	1600	1.41	1.67	2.61
	1700	2.12	2.10	3.63

Fig. 1. Surface morphologies of the GF/SiBCN composites heat treated at different temperatures: (a) untreated; (b) 1400?°C; (c) 1500?°C; (d) 1600?°C; and (e) 1700?°C.

Fig. 2. Cross-section morphologies of the GF/SiBCN composites heat treated at different temperatures: (a) (a-1) 1400?°C; (b) (b-1) 1500?°C; (c) (c-1) 1600?°C; and (d) (d-1) 1700?°C.

Fig. 3. Raman spectra of the GF/SiBCN composites treated at different temperatures.

Fig. 4. X-ray diffraction patterns of the GF/SiBCN composite treated at different temperatures.

Fig. 5. High resolution XPS spectra of the surface of the GF/SiBCN composites: (a) C1s; (b) B1s; and (c) Si2p.

Fig. 6. High resolution XPS spectra of the GF/SiBCN composites annealed at different temperatures.

Table 2 Bonding states and contents analyzed by XPS for the GF/SiBCN composites treated at different temperatures.

Bonding type		Bonding content (at%)
Bonding type		HT-1400?°C	HT-1500?°C	HT-1600?°C	HT-1700?°C
Si2p	Si-N	57.52	52.04	48.68	30.53
Si2p	Si-C	42.48	47.96	51.32	69.47
C1s	C-O	38.85	41.30	24.67	17.31
	C-C	59.44	55.92	65.89	75.75
	C-Si and C-B	1.71	2.77	9.44	6.94
B1s	B-O	6.84	-	-	-
	B-N	19.37	12.59	29.76	24.3
	B-C	73.79	87.41	70.24	75.67

Fig. 7. TEM analysis of the GF/SiBCN composite annealed at 1700?°C: (a) low magnification; (b) and (c) high magnification.

Fig. 8. Schematic diagram showing the evolution of the microstructure for the GF/SiBCN composites annealed at different temperatures.

Fig. 9. (a) SEA; (b) SER; and (c) SET of the GF/SiBCN composites annealed at 1400-1700?°C and (d) SE at 10?GHz.

Table 3 Comparison of the EMI SEs and specific EMI SEs for different carbon/ceramic composites.

Matrix	Filler	Filler content	Thickness (mm)	EMI SE (dB)	Specific EMI SE (dB•cm³/g)	Ref.
Al₂O₃	GN	2vol%	1.5	22	~6.1	[25]
BaTiO₃	GN	4wt%	1.5	41.7	~7.6	[26]
B₄C	GN	5vol%	2	37-39	15	[27]
Si₃N₄	PyC	11.7?vol%	1.4	~36	~17.6	[28]
Si₃N₄	PyC	11.7?vol%	2.8	43.2	~21.2	[28]
SiO₂	MWCNT	10vol%	5	33	~15	[29]
SiBCN	GF	0.5?wt%	1.3	25.5	40	This work

Fig. 10. Reflected, transmitted, and absorbed power of the GF/SiBCN composite as a function of the heat-treatment temperature.

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