STP1475

    Tensile, Flexural, and Shear Properties of Neutron Irradiated SiC/SiC Composites with Different Fiber-Matrix Interfaces

    Published: Jan 2006


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    Abstract

    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/m2 (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.

    Keywords:

    SiC/SiC composites, neutron irradiation effect, tensile, inter-laminar shear, flexure, Small specimen test technique


    Author Information:

    Nozawa, T
    Postdoctoral Research AssociatePostdoctoral Associate, Institute of Advanced Energy, Kyoto UniversityOak Ridge National Laboratory, KyotoOak Ridge, TN

    Ozawa, K
    Graduate Student, Graduate School of Energy Science, Kyoto University, Kyoto,

    Kondo, S
    Graduate Student, Graduate School of Energy Science, Kyoto University, Kyoto,

    Hinoki, T
    Lecturer, Institute of Advanced Energy, Kyoto University, Kyoto,

    Katoh, Y
    Senior Researcher, Oak Ridge National Laboratory, Oak Ridge, TN

    Snead, LL
    Senior Researcher, Oak Ridge National Laboratory, Oak Ridge, TN

    Kohyama, A
    Professor, Institute of Advanced Energy, Kyoto University, Kyoto,


    Paper ID: STP37594S

    Committee/Subcommittee: E10.10

    DOI: 10.1520/STP37594S


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