Microstructure and Mechanical Property of 3D Textile C/SiC Composites Fabricated by Chemical Vapor Infiltration

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Three dimensional textile carbon fiber reinforced silicon carbide (3D textile C/SiC) composites with pyrolytic carbon interfacial layer were fabricated by chemical vapor infiltration. The microstructure and mechanical property of 3D textile C/SiC composites were investigated. A thin pyrolysis carbon layer (0.2 ± μm) was firstly deposited on the surface of carbon fiber as the interfacial layer with C3H6 at 850°C and 0.1 MPa. Methyltrichlorosilane (CH3SiCl3 or MTS) was used for the deposition of the silicon carbide matrix. The conditions used for SiC deposition were 1100°C, a hydrogen to MTS ratio of 10 and a pressure of 0.1 MPa. The density of the composites was 2.1 g cm-3. The flexural strength of the 3D textile C/SiC composites was 438 MPa. The 3D textile C/SiC composites with pyrolytic carbon interfacial layer exhibit good mechanical properties and a typical failure behavior involving fibers pull-out and brittle fracture of sub-bundle. The real part (ε′) and imaginary part (ε″) of the complex permittivity of the 3D-C/SiC composites are 51.53-52.44 and 41.18-42.08 respectively in the frequency range from 8.2 to 12.4 GHz. The 3D-C/SiC composites would be a good candidate for microwave absorber.

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Periodical:

Advanced Materials Research (Volumes 11-12)

Main Theme:

Edited by:

Masayuki Nogami, Riguang Jin, Toshihiro Kasuga and Wantai Yang

Pages:

81-84

DOI:

10.4028/www.scientific.net/AMR.11-12.81

Citation:

D. L. Zhao et al., "Microstructure and Mechanical Property of 3D Textile C/SiC Composites Fabricated by Chemical Vapor Infiltration", Advanced Materials Research, Vols. 11-12, pp. 81-84, 2006

Online since:

February 2006

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Price:

$35.00

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[20] [30] [40] [50] [60] [70] [80] 8 9 10 11 12 13 f /GHz ε' ε.

0. 2 0. 4 0. 6 0. 8.

[1] tgδ ε' ε" tgδ Fig. 6. The ε', ε" and tgδ of 3D-C/SiC composites versus frequency Fig. 5. Stress-displacement curve for 3D C/SiC composites.

100 200 300 400 500 0 0. 5 1 1. 5 2 2. 5 3 Displacement / mm Stress / MPa.

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