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Evaluation of Neutron Irradiated Near-stoichiometric Silicon Carbide Fiber Composites by L.L Snead; Y Katoh; A Kohyama; J.L Bailey; N.L Vaughn; R.A Lowden is a Materials Science article available to read on EtoBox.

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Composites have been fabricated by chemical vapor in®ltration of silicon carbide (SiC) into SiC-based ®ber preforms. Fibers were Ceramic Grade Nicalonä, Hi-Nicalonä and Hi-Nicalonä Type-S. Results are presented for two parallel studies on the eects of neutron irradiation on these materials. In the ®rst study, neutron irradiation induced changes in mechanical properties, as measured by bend testing, for Hi-Nicalonä ®ber materials of varied interphase structures is measured. Results indicate that both the Ceramic Grade Nicalonä and Hi-Nicalonä materials degrade substantially under irradiation, though the higher oxygen content Ceramic Grade ®ber degrades more rapidly and more substantially. Of the three interfaces studied in the Hi-Nicalonä system, the multilayer SiC is the most radiation resistant. At a dose of $1 dpa the mechanical property degradation of the Hi-Nicalonä composite is consistent with a ®ber densi®cation-induced debonding. At a dose of 10 dpa the properties continue to degrade raising the question of degradation in the CVD SiC matrix as well. Low-dose results on the Hi-Nicalonä Type-S fabricated material are encouraging, as they appear to not lose, and perhaps slightl

Who reads Evaluation of Neutron Irradiated Near-stoichiometric Silicon Carbide Fiber Composites?

Author

L.L Snead; Y Katoh; A Kohyama; J.L Bailey; N.L Vaughn; R.A Lowden

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-3115)

Published

2000

Language

EN

Field

Materials Science (Physical Sciences)