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Journal of Inorganic Materials

Journal of Inorganic Materials >

2009 , Vol. 24 >Issue 5: 939 - 942

DOI: https://doi.org/10.3724/SP.J.1077.2009.00939

Research Paper

Microstructures, Strength and Toughness of 2D Cf/(C-SiC) Composites by
Chemical Vapor Infiltration

  • MENG Zhi-Xin ,
  • CHENG Lai-Fei ,
  • ZHANG Li-Tong ,
  • XU Yong-Dong ,
  • HAN Xiu-Feng
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  • (National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi’an 710072, China)

Received date: 2008-12-15

  Revised date: 2009-03-07

  Online published: 2009-09-20

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Abstract

Two dimensional carbon fiber-reinforced silicon carbide-carbon binary matrix composites (2D Cf/(SiC-C)) were fabricated by means of isothermal and isobaric chemical vapor infiltration (ICVI). The matrix structures of the 2D Cf/(SiC-C) composites were characterized by the backscattered electron imaging (BSE) of scanning electron microscope (SEM). Furthermore, their room temperature mechanical properties and fracture surfaces were compared with two dimensional carbon fiber-reinforced silicon carbide matrix composite (2D Cf/SiC). The results indicate that the matrices in the 2D Cf/(SiC-C) composites are multilayered structures composed of SiC and PyC layers. The PyC matrix layers are homogeneous and continuous, which are bonding well with SiC matrix layers. The 2D Cf/(SiC-C) composite with a thicker PyC matrix layer in fiber bundles exhibits better mechanical properties. Meanwhile, its tensile strength, failure strain, fracture toughness and fracture work are 3%, 142%, 22% and 58% higher than those of the 2D Cf/SiC composite, respectively. The multilayered matrices composed of SiC and PyC layers, cause the fibers in the 2D Cf/(C-SiC) composites to pull out twice in a concentrated mode. Moreover, the first pull-out fibers play a leading role in enhancing the strength and toughness.

Key words： binary matrix composites; microstructure; strength and toughness; chemical vapor infiltration

Cite this article

MENG Zhi-Xin , CHENG Lai-Fei , ZHANG Li-Tong , XU Yong-Dong , HAN Xiu-Feng . Microstructures, Strength and Toughness of 2D Cf/(C-SiC) Composites by
Chemical Vapor Infiltration[J]. Journal of Inorganic Materials, 2009 , 24(5) : 939 -942 . DOI: 10.3724/SP.J.1077.2009.00939

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