TY - JOUR
T1 - Tensile, flexural, and shear properties of neutron irradiated SiC/SiC composites with different fiber-matrix interfaces
AU - Nozawa, Takashi
AU - Ozawa, Kazumi
AU - Kondo, Sosuke
AU - Hinoki, Tatsuya
AU - Katoh, Yutai
AU - Snead, Lance L.
AU - Kohyama, Akira
PY - 2005/2
Y1 - 2005/2
N2 - 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.
AB - 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.
KW - Flexure
KW - Inter-laminar shear
KW - Neutron irradiation effect
KW - SiC/SiC composites
KW - Small specimen test technique
KW - Tensile
UR - http://www.scopus.com/inward/record.url?scp=27844560033&partnerID=8YFLogxK
U2 - 10.1520/JAI12884
DO - 10.1520/JAI12884
M3 - Article
AN - SCOPUS:27844560033
SN - 1546-962X
VL - 2
SP - 215
EP - 227
JO - Journal of ASTM International
JF - Journal of ASTM International
IS - 2
ER -