<trans-title>Influence of SiC Nanowires on the Damage Evolution of SiC<sub>f</sub>/SiC Composites </trans-title>

Longbin LI; Yudong XUE; Jianbao HU; Jinshan YANG; Xiangyu ZHANG; Shaoming DONG

doi:10.15541/jim20210045

Journal of Inorganic Materials, Volume. 36, Issue 10, 1111(2021)

Influence of SiC Nanowires on the Damage Evolution of SiC_f/SiC Composites

Longbin LI1...2, Yudong XUE1,2, Jianbao HU1,2, Jinshan YANG1,2, Xiangyu ZHANG1,2, and Shaoming DONG12,* |Show fewer author(s)

Author Affiliations

¹1. State Key Laboratory of High Performance Ceramics and Superﬁne Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

²2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

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Figures & Tables(10)

. Schematic figure of three-point test within-situ AE monitoring system

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. Typical SEM images of (a, b) as-grown SiC_nw, (c) BN-coated SiC_nw, and typical SEM images demonstrating the pore size of (d) SiC_f/SiC and (e) SiC_f/SiC-SiC_nw composites

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$SEM fractural morphologies of (a) as-grown SiCnw, (b, c) BN-coated SiCnw in composites Local parts marked by white rectangular borders demonstrating that SiCnw tends to break (a) or pull out (b, c)$

. SEM fractural morphologies of (a) as-grown SiC_nw, (b, c) BN-coated SiC_nw in composites Local parts marked by white rectangular borders demonstrating that SiC_nw tends to break (a) or pull out (b, c)

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. Fracture morphologies of composite (a) SiC_f/SiC, (b) SiC_f/SiC-SiC_nwand (c) SiC_f/SiC-SiC_nw/BN The images demonstrating the pull-out length of fibers

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. Representative normalized cumulative AE energy curves as a function of stress (a) for composite SiC_f/SiC (orange), SiC_f/SiC-SiC_nw (black) and SiC_f/SiC-SiC_nw/BN (blue)

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. Typical stress-strain curves of SiC_f/SiC(orange), SiC_f/SiC-SiC_nw(black) and SiC_f/SiC-SiC_nw/BN (blue)

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. Scatter diagrams of the energy of individual AE events as a function of time in composites (a) SiC_f/SiC, (b) SiC_f/SiC-SiC_nw, and (c) SiC_f/SiC-SiC_nw/BN

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. SEM micrographs of crack propagation around the indentation in composites (a) SiC_f/SiC; (b) SiC_f/SiC-SiC_nw; (c) SiC_f/SiC-SiC_nw/BN

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Table 1.
Density and porosity of different composites
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Table 1.
Density and porosity of different composites
Composite SiC_f/SiC SiC_f/SiC- SiC_nw/BN SiC_f/ SiC-SiC_nw
Bulk density/(g·cm^-3) (1.98±0.03) (2.02±0.04) (2.08±0.03)
Open porosity/% (17.64±1.08) (14.39±0.60) (11.58±1.35)

Table 2.
Properties of original composites, as-grown and BN-coated hierarchical composites

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Table 2.
Properties of original composites, as-grown and BN-coated hierarchical composites

Composite	SiC_nwcontent / wt%	Flexural strength, σ_u/MPa	Proportional limit stress, σ_PL/MPa	Strain at flexural strength, ε_u/%	First AE stress, σ_min/MPa	AE onset stress, σ_onset/MPa
SiC_f/SiC	0	(356.7±16.2)	(153.9±6.4)	(0.39±0.05)	(58.8±7.5)	(116.1±8.9)
SiC_f/SiC-SiC_nw	2.0	(412.6±22.4)	(185.1±7.7)	(0.63±0.06)	(66.1±6.2)	(155.8±7.7)
SiC_f/SiC-SiC_nw/BN	2.0	(506.4±28.3)	(247.7±8.6)	(0.88±0.12)	(78.5±5.2)	(171.6±15.9)

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Longbin LI, Yudong XUE, Jianbao HU, Jinshan YANG, Xiangyu ZHANG, Shaoming DONG. Influence of SiC Nanowires on the Damage Evolution of SiC_f/SiC Composites [J]. Journal of Inorganic Materials, 2021, 36(10): 1111

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