Experimental study of high-temperature tensile mechanical properties of 3D needled C/C-SiC composites

Zhen Chen, Guodong Fang*, Junbo Xie, Jun Liang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

69 Citations (Scopus)

Abstract

In-plane tensile experiments for 3D needled C/C-SiC composites were conducted from room temperature to 2000. °C to study the tensile behavior and microscopic failure mechanisms. Results show that the tensile strength, toughness and failure strain increase with the increase of temperature, while the modulus decreases. The tensile strength increases gradually from 98.7 to 162.6. MPa at 1800. °C and then decreases to 154.3. MPa at 2000. °C. At elevated temperatures, a large amount of fibers are pulled out, and the fracture surfaces show jagged patterns, which indicates that the interfacial strength decreases with the increase of temperature. The weak interface can induce the lower tensile modulus, and can improve the tensile strength of the C/C-SiC composites. At high temperature, the weak interfacial strength can be attributed to the release of thermal residual stress and graphitization of pyrolytic carbon.

Original languageEnglish
Pages (from-to)271-277
Number of pages7
JournalMaterials Science and Engineering: A
Volume654
DOIs
Publication statusPublished - 27 Jan 2016
Externally publishedYes

Keywords

  • High temperature
  • Interface
  • Needled composites
  • Phase transformation
  • Tensile strength

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