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Effect of C/SiC interphase on interfacial and mechanical properties of SiC fiber reinforced mullite matrix composites


Continuous SiC fiber reinforced mullite (SiCf/Mu) matrix composite was fabricated via sol–gel process. The capability of fiber coatings to weaken the interfacial interaction, thus to enhance the fracture toughness of the SiCf/Mu composite was explored. The results show that the SiC interphase fabricated by chemical vapor deposition (CVD) process was columnar-grain structured. A thin carbon layer was also produced during the CVD process, forming C/SiC interphase. The interfacial shear strength of the SiCf/Mu composite was significantly reduced from ≈537 to ≈115 MPa after the introduction of C/SiC interphase, as quantified by in situ fiber push-in tests. Accordingly, the macro fracture toughness of the composite was remarkably enhanced from ≈0.9 to ≈10.5 MPa m1/2. The work highlights the efficiency of using C/SiC interphase to weaken the interfacial bonding, thus greatly toughen the SiCf/Mu composite.


  • The interfacial bonding between fiber and matrix in the SiCf/mullite composite is very strong.

  • The introduction of the C/SiC interphase could reduce the interfacial shear strength.

  • The flexural strength and fracture toughness of the SiCf/SiC/mullite composite are higher than those of SiCf/mullite composite.

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HL greatly appreciates the financial support from Natural Science Foundation for Distinguished Young Scholars of Hunan Province (Grant Number: 2020JJ2032) and 1912 Project.

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Correspondence to Ru Jiang or Haitao Liu.

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Deng, G., Sun, X., Tian, Z. et al. Effect of C/SiC interphase on interfacial and mechanical properties of SiC fiber reinforced mullite matrix composites. J Sol-Gel Sci Technol 98, 335–341 (2021).

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  • SiCf/Mu composites
  • Interface
  • Fracture toughness
  • Mechanical properties