Tensile, flexural, and shear properties of neutron irradiated SiC/SiC composites with different fiber-matrix interfaces

Takashi Nozawa, Kazumi Ozawa, Sosuke Kondo, Talsuya Hinoki, Yutai Katoh, Lance L. Snead, Akira Kohyama

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Citations (Scopus)


Unidirectional SiC/SiC composites fabricated with highly-crystalline and stoichiometric fibers and matrix, but with three different interfacial types (single-layer pyrolytic carbon (PyC), multi-layered SiC/PyC, and pseudo porous SiC interfaces) were irradiated up to 1.0 × 1025 n/m 2 (E > 0.1 MeV) at 1073 and 1273 K. Tensile, inter-laminar shear, and flexural properties were evaluated to compare the role of different interfaces on neutron irradiation behavior. There was nearly no significant degradation in tensile and flexural strength after high-temperature neutron irradiation, except for porous SiC interphase composite. Moreover, no meaningful reduction of tensile modulus was identified regardless of interphase types, although 20-40 % degradation in flexural moduli occurred due to a reduction in inter-laminar shear modulus. In contrast, matrix cracking stress was significantly dependent on interfacial properties. Multilayer interphase composites exhibited the best irradiation stability. Irradiation instability of thick PyC and porous SiC interphase resulted in 20 % and 40 % degradations of matrix cracking stress, respectively. Copyright O 2005 by ASTM International.

Original languageEnglish
Title of host publicationEffects of Radiation on Materials
Subtitle of host publication22nd Symposium
PublisherAmerican Society for Testing and Materials
Number of pages13
ISBN (Print)0803134010, 9780803134010
Publication statusPublished - 2006
Event22nd Symposium on Effects of Radiation on Materials - Boston, MA, United States
Duration: 2004 Jun 82004 Jun 10

Publication series

NameASTM Special Technical Publication
Volume1475 STP
ISSN (Print)0066-0558


Conference22nd Symposium on Effects of Radiation on Materials
Country/TerritoryUnited States
CityBoston, MA


  • Flexure
  • Inter-laminar shear
  • Neutron irradiation effect
  • SiC/SiC composites
  • Small specimen test technique
  • Tensile


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