Complex Permittivity of 3D Textile SiC/C/SiC Composites Fabricated by Chemical Vapor Infiltration at X-Band Frequency

Three-dimensional textile SiC fiber reinforced SiC composites with pyrolytic carbon interfacial layer (3D-SiC/C/SiC) were fabricated by chemical vapor infiltration. The microstructure and complex permittivity of the 3D textile SiC/C/SiC composites were investigated. The flexural strength of the 3D textile SiC/C/SiC composites was 860 MPa at room temperature. The real part (ε′) and imaginary part (ε″) of the complex permittivity of the 3D-SiC/C/SiC composites are 9.11~10.03 and 4.11~4.49, respectively at the X-band frequency. The 3D-SiC/C/SiC composites would be a good candidate for structural microwave absorbing material.

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Complex Permittivity of 3D Textile SiC/C/SiC Composites Fabricated by Chemical Vapor Infiltration at X-Band Frequency

High-Performance Ceramics V - Key Engineering Materials ◽

10.4028/0-87849-473-1.1028 ◽

2008 ◽

pp. 1028-1030

Author(s):

Dong Lin Zhao ◽

Hong Feng Yin ◽

Yong Dong Xu ◽

Fa Luo ◽

Wan Cheng Zhou

Keyword(s):

Complex Permittivity ◽

Chemical Vapor ◽

Chemical Vapor Infiltration ◽

Band Frequency ◽

X Band ◽

Sic Composites ◽

Vapor Infiltration

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Microstructure and Mechanical Properties of Three-Dimensional Textile Hi-Nicalon SiC/SiC Composites by Chemical Vapor Infiltration

Journal of the American Ceramic Society ◽

10.1111/j.1151-2916.2002.tb00248.x ◽

2004 ◽

Vol 85 (5) ◽

pp. 1217-1221 ◽

Cited By ~ 8

Author(s):

Yongdong Xu ◽

Laifei Cheng ◽

Litong Zhang ◽

Hongfeng Yin ◽

Xiaowei Yin

Keyword(s):

Mechanical Properties ◽

Three Dimensional ◽

Chemical Vapor ◽

Chemical Vapor Infiltration ◽

Microstructure And Mechanical Properties ◽

Sic Composites ◽

Vapor Infiltration

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.11-12.81 ◽

2006 ◽

Vol 11-12 ◽

pp. 81-84 ◽

Cited By ~ 3

Author(s):

Dong Lin Zhao ◽

Hong Feng Yin ◽

Fa Luo ◽

Wan Cheng Zhou

Keyword(s):

Mechanical Property ◽

Silicon Carbide ◽

Carbon Fiber ◽

Interfacial Layer ◽

Chemical Vapor ◽

Pyrolytic Carbon ◽

Chemical Vapor Infiltration ◽

Sic Composites ◽

Microstructure And Mechanical Property ◽

Vapor Infiltration

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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X-Ray Tomographic Microscopy of Nicalon Preforms and Chemical Vapor Infiltrated Nicalon/Silicon Carbide Composites

MRS Proceedings ◽

10.1557/proc-250-215 ◽

1991 ◽

Vol 250 ◽

Cited By ~ 4

Author(s):

M. D. Butts ◽

S. R. Stock ◽

J. H. Kinney ◽

T. L. Starr ◽

M. C. Nichols ◽

...

Keyword(s):

Three Dimensional ◽

Chemical Vapor ◽

Chemical Vapor Infiltration ◽

High Resolution Computed Tomography ◽

X Ray ◽

Sic Fiber ◽

Sic Composites ◽

And Control ◽

Fiber Preforms ◽

Very High

AbstractFollowing the evolving microstructure of composites through all stages of chemical vapor infiltration (CVI) is a key to improved understanding and control of the process. X-ray Tomographic Microscopy (XTM), i.e., very high resolution computed tomography, allows the microstructure of macroscopic volumes of a composite to be imaged nondestructively with resolution approaching one micrometer. Results obtained with XTM on dense SiC/SiC composites and on woven SiC fiber preforms illustrate how details of the densification process can be followed using this technique during interruptions in processing. Ways in which the three-dimensional microstructural information may be used to improve modeling are also indicated.

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