Evaluation of Damage Tolerance of Advanced SiC/SiC Composites after Neutron Irradiation

Ozawa, Kazumi; Katoh, Yutai; Nozawa, Takashi; Hinoki, Tatsuya; Snead, Lance L.

doi:10.1088/1757-899x/18/16/162005

Evaluation of Damage Tolerance of Advanced SiC/SiC Composites after Neutron Irradiation

Conference · Tue Nov 01 04:00:00 EDT 2011 · IOP Conference Series: Materials Science and Engineering

DOI:https://doi.org/10.1088/1757-899x/18/16/162005· OSTI ID:1056910

Ozawa, Kazumi; Katoh, Yutai; Nozawa, Takashi; Hinoki, Tatsuya; Snead, Lance L.

Silicon carbide composites (SiC/SiC) are attractive candidate materials for structural and functional components in fusion energy systems. The effect of neutron irradiation on damage tolerance of the nuclear grade SiC/SiC composites (plain woven HiNicalon™ Type-S reinforced CVI matrix composites multilayer interphase and unidirectional Tyranno™-SA3 reinforced NITE matrix with carbon mono-layer interphase) was evaluated by means of miniaturized single-edged notched beam test. No significant changes in crack extension behavior and in the load-loadpoint displacement characteristics such as the peak load and hysteresis loop width were observed after irradiation to 5.9 × 1025 n/m2 (E > 0.1 MeV) at 800oC and to 5.8 × 1025 n/m2 at 1300oC. By applying a global energy balance analysis based on non-linear fracture mechanics, the energy release rate for these composite materials was found to be unchanged by irradiation with a value of 3±2 kJ/m2. This has led to the conclusion that, for these fairly aggressive irradiation conditions, the effect of neutron irradiation on the fracture resistance of these composites appears insignificant.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1056910

Conference Information:: Journal Name: IOP Conference Series: Materials Science and Engineering Journal Issue: 16 Journal Volume: 18

Country of Publication:: United States

Language:: English

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