Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 384, Issue 3, Pages 195-211Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2008.11.015
Keywords
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Funding
- Office of Fusion Energy Sciences
- US Department of Energy [DE-AC05-00OR22725]
- LLC
- US Department of Energy Office of Nuclear Energy, Science and Technology
- Nuclear Energy Research Initiative (NERI) [NEAF355 (AF3510)]
- 'JUPITER-II' US-Department of Energy/Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT)
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Given the good stability of mechanical properties of silicon carbide (SiC) under neutron irradiation, the ultimate irradiation tolerance of SiC composite materials may be limited by the fiber/matrix interphase, which is critically important to the performance of these composites. This study investigates the irradiation stability of pyrolytic carbon (PyC) monolayer and PyC/SiC multilayer interphases by tensile and single fiber push-out test techniques. Neutron irradiation was performed to doses of 0.7-7.7 dpa at temperatures from 380 to 1080 degrees C. Both interfacial debond shear strength and interfacial friction stress apparently decrease by irradiation, although this is not so dramatic when T-irr < 1000 degrees C. In contrast, the interfacial shear stresses are most affected by the higher temperature irradiation (> 1000 degrees C). Noteworthy, these irradiation effects depend on the type of interphase material, i.e.. for the pyrolytic carbon or multilayer SiC variants studied. In the range of irradiation temperature and dose, the degradation in interfacial shear properties. while measurable, is not of a magnitude to degrade the mechanical performance of the composites. This was observed for both interphase types studied. In particular, the proportional limit tensile stress decreases slightly by irradiation while the tensile fracture Strength undergoes very minor change. (C) 2008 Elsevier B.V. All rights reserved.
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