Effect of stitch spacing on mechanical properties of carbon/silicon carbide composites

Jingjiang Nie, Yongdong Xu, Litong Zhang, Xiaowei Yin, Laifei Cheng, Junqiang Ma

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Abstract

The effects of stitch spacing on the mechanical properties of the carbon fiber reinforced silicon carbide composites fabricated by chemical vapor infiltration (CVI) were investigated. The results showed that the stitch spacing had little effect on the density and open porosity of the composites. The stitches improved the shear and tensile strengths of all stitched C/SiC composites, by suppressing and delaying the delamination. However, flexural strength was not changed for the composites with stitch spacing of 10 mm or 5 mm, but was slightly reduced for densely stitched composites with spacing of 2.5 mm. The optimum stitch spacing was 5 mm, which improved apparently the interlaminar shear strength and tensile strength of the composites with little detrimental effect on the flexural strength.

Original languageEnglish
Pages (from-to)2425-2432
Number of pages8
JournalComposites Science and Technology
Volume68
Issue number12
DOIs
StatePublished - Sep 2008

Keywords

  • A. Ceramic-matrix composites
  • B. Mechanical properties
  • B. Microstructure
  • E. Chemical vapor infiltration
  • Stitch

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