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

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

Research output: Contribution to journalArticlepeer-review

9 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), multilayered SiC/PyC, and pseudo porous SiC interfaces) were irradiated up to 1.0 × 10 25 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.

Original languageEnglish
Pages (from-to)215-227
Number of pages13
JournalJournal of ASTM International
Issue number2
Publication statusPublished - 2005 Feb 1
Externally publishedYes


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

ASJC Scopus subject areas

  • Environmental Engineering
  • Materials Science(all)
  • Nuclear Energy and Engineering
  • Engineering(all)
  • Public Health, Environmental and Occupational Health


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