Mechanical behavior of SiCf/SiC composites with alternating PyC/SiC multilayer interphases

H Yu, Xingui Zhou, Wei Zhang, Hua-Xin Peng, Changrui Zhang

Research output: Contribution to journalArticle (Academic Journal)peer-review

90 Citations (Scopus)

Abstract

In order to tailor the fiber-matrix interface of continuous silicon carbide fiber reinforced silicon carbide (SiCf/SiC) composites for improved fracture toughness, alternating pyrolytic carbon/silicon carbide (PyC/SiC) multilayer coatings were applied to the KD-I SiC fibers using chemical vapor deposition (CVD) method. Three dimensional (3D) KD-I SiCf/SiC composites reinforced by these coated fibers were fabricated using a precursor infiltration and pyrolysis (PIP) process. The interfacial characteristics were determined by the fiber push-out test and microstructural examination using scanning electron microscopy (SEM). The effect of interface coatings on composite mechanical properties was evaluated by single-edge notched beam (SENB) test and three-point bending test. The results indicate that the PyC/SiC multilayer coatings led to an optimum interfacial bonding between fibers and matrix and greatly improved the fracture toughness of the composites. (C) 2012 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)320-324
Number of pages5
JournalMaterials and Design
Volume44
DOIs
Publication statusPublished - Feb 2013

Keywords

  • STRESS
  • FABRICATION
  • Silicon carbide
  • CERAMIC-MATRIX COMPOSITES
  • FIBERS
  • STRENGTH
  • Mechanical property
  • Interface
  • DEGRADATION
  • Toughness
  • PYROLYSIS
  • INFILTRATION
  • DEFLECTION
  • SIC/SIC COMPOSITES
  • Composite

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