High-temperature cyclic fatigue in air of SiCf/SiC ceramic matrix composite with a pyrolytic carbon interface

Kyung Ho Kim, Kyoon Choi, Yoon Soo Han, Sahn Nahm, Sung Min Lee

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


A cyclic fatigue test of SiCf/SiC ceramic matrix composites was conducted at 1400°C and compared to the monotonic tensile test. The specimens were prepared with an interface layer of pyrolytic carbon and densified through chemical vapor infiltration. In the monotonic tensile test, at 1400°C, the specimen fractured at a strain of 0.35% with a proportional limit stress of 175 MPa, showing a typical fiber pull-out. However, after a prolonged cyclic test with increasing stresses from 65 to 95 MPa, the specimen fractured brittlely with almost no fiber pull-out. The microstructure analysis of the fracture surface showed different oxidation levels with respect to fracture locations, indicating that the crack propagated during the cyclic fatigue test. Transmission electron microscopy analysis revealed that the interface layer of pyrolytic carbon was removed by oxidation and oxide layers were formed on both sides of the fiber and matrix at the later stage of the cyclic test, resulting in a strong interface between the fibers and matrix and brittle fracture during the cyclic test at 1400°C.

Original languageEnglish
Pages (from-to)325-334
Number of pages10
JournalHigh Temperatures - High Pressures
Issue number4-5
Publication statusPublished - 2021

Bibliographical note

Funding Information:
This work was supported by the Ministry of Trade, Industry and Energy (grant number of 10065691 and 20000192).

Publisher Copyright:
© 2021 Old City Publishing. All rights reserved.


  • Ceramic matrix composite
  • Cyclic fatigue
  • Fracture
  • Tensile test

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Physical and Theoretical Chemistry


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