Electromagnetic interference shielding properties of polymer derived SiC-Si3N4 composite ceramics

doi:10.1016/j.jmst.2019.07.006

Abstract

Abstract:

SiC-Si₃N₄ composite ceramics are successfully fabricated by pyrolysis of ferrocene-modified polycarbosilane (PCS) mixed with inert filler Si₃N₄ powders, followed by thermal treatment from 1100?°C to 1400?°C in Ar atmosphere. The porosity of SiC-Si₃N₄ ceramics decreases to 6.4% due to the addition of inert filler Si₃N₄. And the content and crystallization degree of free carbon and SiC derived from PCS are improved simultaneously with the increase of thermal treatment temperature. Finally, the free carbon and SiC interconnect, forming the conductive network. As a result, the electromagnetic interference (EMI) shielding performance of the as-prepared ceramic annealed at 1400?°C reaches up to 36?dB, meaning more than 99.9% of EM energy is shielded. The low porosity and high EMI shielding performance enable SiC-Si₃N₄ composite ceramics to be a promising electromagnetic shielding and structural material.

Key words: Polymer derived ceramics, Electromagnetic shielding properties, SiC-Si₃N₄, Inert filler

Xiaoling Liu, Xiaowei Yin, Wenyan Duan, Fang Ye, Xinliang Li. Electromagnetic interference shielding properties of polymer derived SiC-Si₃N₄ composite ceramics[J]. J. Mater. Sci. Technol., 2019, 35(12): 2832-2839.

Figures/Tables 12

Table 1 Comparison of EMI shielding properties of SiC composite ceramics fabricated by PDCs.

Materials Conductive phase/Matrix	Fabrication	D (mm)	Ρ (g/cm³)	P (%)	SE_T (dB)	SE_A (dB)	SE_R (dB)	Ref.
SiC/amorphous SiC	PDCs	3	1.43	40	15	11	4	[25]
SiC-C/amorphous SiC	PDCs?+?Ferrocene modified	3.2	1.3	47	36	30	6	[17]
SiC-C/amorphous SiOC	PDCs?+?Ferrocene modified	2.5	1.3	45	18	15	3	[19]
SiC-C/Si3N4	PDCs + 3DP?+?PIP(IV) + Ferrocene modified	2	2.09	21	35	28	7	[26]
SiC-C/Si3N4	PDCs?+?Ferrocene modified?+?powder mixed	3	1.9	6.4	35	27	8	This work

Fig. 1 presents the TGA and DSC curves of solidified and ground PCS powder containing 5?wt% ferrocene and 50?wt% Si3N4 powder under the protection of the inert Ar atmosphere.

Fig. 1. TGA-DSC curve of PCS-Si3N4 mixed powders containing 5% ferrocene.

Table 2 Porosity and density of SiC-Si3N4 composite ceramics.

	900 °C	1100 °C	1200 °C	1300 °C	1400 °C
Density (g/cm³)	1.82	1.90	1.91	1.90	1.91
Porosity (%)	7.0	6.4	6.3	4.7	6.4

Fig. 2. XRD pattern of SiC-Si3N4 ceramics at different heat temperatures (a) and magnified XRD graph at 1300?°C, 1400?°C (b).

Fig. 3. Raman spectrum of SiC-Si3N4 ceramics at different heat temperatures.

Table 3 Raman spectroscopy fitting curve data of SiC-Si3N4 composite ceramics.

Samples	D peak position (cm^-1)	FWHH_D	G peak position (cm^-1)	FWHH_G	I_D/I_G
900?°C	1346	238	1575	127	1.16
1100?°C	1351	230	1584	111	1.17
1200?°C	1347	228	1577	117	1.22
1300?°C	1349	200	1594	94	1.21
1400?°C	1346	182	1590	96	1.21

Fig. 4. SEM images of samples at 900?°C (a), 1100?°C (b), 1200?°C (c), 1300?°C (d), 1400?°C (e) and (f).

Fig. 5. TEM images of the sample at 1400?°C.

Fig. 6. Schematic illustration of the microstructure evolution of PDCs SiC-Si3N4: (a) amorphous phase and Si3N4, (b) beginning to precipitate the conductive phase, (c) forming a conductive network, (d) decomposition of Si3N4 on the surface at 1400?°C.

Fig. 7. Direct-current conductivity (σdc) of the sample at different annealing temperatures.

Fig. 8. Electromagnetic shielding properties of the sample at different heat treatment temperatures: (a) SET, (b) SER, (c) SEA.

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Electromagnetic interference shielding properties of polymer derived SiC-Si₃N₄ composite ceramics

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