Abstract
Two types of SiC fibers, SiC(1000) and SiC(1300), were irradiated with JMTR and RTNS-II. The SiC(l000) fiber is amorphous SiC, and the SiC(1300) fiber is macrocrystalline β-SiC. Tensile strength. Young's modulus and X-ray radial distribution function (RDF) of both the SiC fibers irradiated at 4 × 10 17 n/cm 2 with RTNS-II ( E = 14 MeV) were not different from the unirradiated state. In both the SiC fibers, when irradiated with JMTR ( E > 1 MeV ), the tensile strength and Young's modulus increased gradually with the neutron fluence. RDFs of both SiC fibers irradiated at 1 × 10 19 and 2 × 10 19 n/cm 2 with JMTR showed that the atomic configuration was disordered by irradiation. It appeared that the SiC fibers were influenced in mechanical properties and atomic arrangement by neutron irradiation. The mechanical properties of neutron-irradiated SiC fibers are compared with those of neutron-irradiated carbon fibers.
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