Morphologies evolution and mechanical behaviors of SiC nanowires reinforced C/(PyC-SiC)n multilayered matrix composites

doi:10.1016/j.jmst.2021.05.004

Abstract

Abstract:

SiC nanowires reinforced C/(PyC-SiC)_n multilayered matrix composites (SM-CS for short) were prepared by combined with sol-gel and chemical vapor infiltration (CVI) method. Firstly, (PyC-SiOC)_n multilayered structure was formed by cycles of impregnation and deposition. Then SiOC was transformed into SiC by heat-treatment, and (PyC-SiC)_n multilayered structure would be obtained. At the same time, the PyC layer which was designed as the outmost layer could decrease gas supersaturation to form in-situ tubular SiC nanowires on the surface of multilayered structure. The results of three-point bending test showed that the maximum force of SM-CS composites was increased by the number of cycles of the preparation process, which were up to enhanced by 74.38% compared with C/C composite materials. The fracture surface showed that the improvement was due to the multiscale reinforcing system of (PyC-SiC)_n multilayered structure and SiC nanowires. Multilayered structure can protect carbon fibers and release stress concentration by induction of cracks. And the mechanical interlocking effect of SiC nanowires could reinforce bonding force of the remaining matrix.

Key words: C/C, Multilayered structure, SiC nanowires, Flexural property

Xinfa Tian, Hejun Li, Xiaohong Shi, Hongjiao Lin, Ningning Yan, Tao Feng. Morphologies evolution and mechanical behaviors of SiC nanowires reinforced C/(PyC-SiC)_n multilayered matrix composites[J]. J. Mater. Sci. Technol., 2022, 96: 190-198.

Figures/Tables 11

Fig. 1. Schematic diagram of preparation of SM-CS composites.

Fig. 2. Microstructure evolution during preparation: (a) SEM image of carbon felts; (b) SEM image after impregnation; (c) SEM image of (PyC-SiOC)n multilayered structure; (d) SEM image after heat-treatment; (e) SEM image after densification; (f) XRD patterns during all preparation.

Fig. 3. SEM images of SiC nanowires: (a) on the surface of carbon felts; (b) inside of carbon felts; (c) magnified SEM.

Fig. 4. TEM images of SiC nanowires: (a) TEM; (b) selected area electron diffraction (SAED) and (c) HRTEM.

Fig. 5. (a) BSE image and (b) EDS patterns of (PyC-SiC)n multilayered structure.

Fig. 6. Mechanism of formation of SiC nanowires and SiC layers.

Table 1 Densities and porosities of specimens.

Sample	Density (g/cm³)	Porosity
C/C	1.7	8.92%
SM-CS2	1.42	31.67%
SM-CS3	1.44	30.19%
SM-CS4	1.45	28.37%

Fig. 7. The load?displacement curves of three-point bending testing.

Fig. 8. Flexural maximum forces of different samples.

Fig. 9. SEM images of (a) unmodified C/C composite, (b, c) modified sample and (d?f) SiC nanowires in the modified sample.

Fig. 10. Schematic diagrams of crack propagation in C/C composites and SM-CS composites.

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