Mechanical and electromagnetic wave absorption properties of Cf-Si3N4 ceramics with PyC/SiC interphases

doi:10.1016/j.jmst.2019.07.002

Abstract

Abstract: Aim

ing to obtain microwave absorbing materials with excellent mechanical and microwave absorption properties, carbon fiber reinforced Si₃N₄ ceramics (C_f-Si₃N₄) with pyrolytic carbon (PyC)/SiC interphases were fabricated by gel casting. The influences of carbon fibers content on mechanical and microwave absorption properties of as-prepared Si₃N₄ based ceramics were investigated.

Results

show that chemical compatibility between carbon fibers and Si₃N₄ matrix in high temperature environment can be significantly improved after introduction of PyC/SiC interphases. As carbon fibers content increases from 0 to 4?wt%, flexural strength of Si₃N₄ based ceramics decreases slightly while fracture toughness obviously increases. Moreover, both the real and imaginary parts of complex permittivity increase with the rising of carbon fibers content within the frequency range of 8.2-12.4?GHz. Investigation of microwave absorption shows that the microwave attenuation ability of C_f-Si₃N₄ ceramics with PyC/SiC interphases is remarkably enhanced compared with pure Si₃N₄ ceramics. Effective absorption bandwidth (<-10?dB) of 10.17-12.4?GHz and the minimum reflection less of -19.6?dB are obtained for Si₃N₄ ceramics with 4?wt% carbon fibers in 2.0?mm thickness. C_f-Si₃N₄ ceramics with PyC/SiC interphases are promising candidates for microwave absorbing materials with favorable mechanical property.

Key words: Silicon nitride, Carbon fibers, PyC/SiC interphases, Mechanical properties, Microwave absorption

Wei Zhou, Lan Long, Yang Li. Mechanical and electromagnetic wave absorption properties of C_f-Si₃N₄ ceramics with PyC/SiC interphases[J]. J. Mater. Sci. Technol., 2019, 35(12): 2809-2813.

Figures/Tables 5

Fig. 1. Phases of as-prepared Si3N4 based ceramics: (a) pure Si3N4 ceramics, (b) Cf-Si3N4 ceramics with PyC/SiC interphases.

Fig. 2. SEM images of fracture surface of as-prepared Si3N4 ceramics after sintering: (a) pure Si3N4 ceramics, (b) Cf-Si3N4 ceramics without PyC/SiC interphases, (c) Si3N4 ceramics with 4?wt% PyC/SiC coated carbon fibers, (d) magnification of Fig. 2(c).

Table 1 Density, open porosity and mechanical properties of the as-prepared ceramics.

Samples	Fiber content (wt%)	Density (g/cm³)	Open Porosity (%)	Flexure strength (MPa)	Fracture toughness (MPa·m^1/2)
C0	0	3.25?±?0.03	1.2?±?0.2	512?±?23	3.43?±?0.7
C2	2	3.18?±?0.03	2.3?±?0.3	368?±?18	6.98?±?0.6
C4	4	3.03?±?0.04	4.1?±?0.3	326?±?21	8.94?±?1.1

Fig. 3. Complex permittivity of Si3N4 based ceramics with different PyC/SiC coated carbon fibers contents: (a) the real permittivity (ε′), (b) the imaginary permittivity (ε″).

Fig. 4. (a) Reflection loss of Si3N4 based ceramics with different PyC/SiC coated carbon fibers contents at 2.0?mm thickness, (b) Reflection loss of Si3N4 based ceramics with 4?wt% PyC/SiC coated carbon fibers in various thicknesses.

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Mechanical and electromagnetic wave absorption properties of C_f-Si₃N₄ ceramics with PyC/SiC interphases

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