Studies on Sintering Silicon Carbide-Nanostructured Ferritic Alloy Composites for Nuclear Applications

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dc.contributor.authorHu, Zhihaoen
dc.contributor.committeechairLu, Peizhenen
dc.contributor.committeememberClark, David E.en
dc.contributor.committeememberAning, Alexander O.en
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2018-01-14T07:00:20Zen
dc.date.available2018-01-14T07:00:20Zen
dc.date.issued2016-07-22en
dc.description.abstractNanostructured ferritic alloy and silicon carbide composite materials (NFA-SiC) were sintered with spark plasma sintering (SPS) method and systematically investigated through X-ray diffraction (XRD), scanning electron microscopy (SEM), as well as density and Vickers hardness tests. Pure NFA, pure SiC, and their composites NFA-SiC with different compositions (2.5 vol% NFA-97.5 vol% SiC, 5 vol% NFA-95 vol% SiC, 97.5 vol% NFA-2.5 vol% SiC, and 95 vol% NFA-5 vol% SiC) were successfully sintered through SPS. In the high-NFA samples, pure NFA and NFA-SiC, minor gamma-Fe phase formation from the main alfa-Fe matrix occurred in pure NFA 950 degree C and 1000 degree C. The densities of the pure NFA and NFA-SiC composites increased with sintering temperature but decreased with SiC content. The Vickers hardness of the pure NFA and NFA-SiC composites was related to density and phase composition. In the high-SiC samples, NFA addition of 2.5 vol% can achieve full densification for the NFA-SiC samples at relative low temperatures. With the increase in sintering temperature, the Vickers hardness of the pure SiC and NFA-SiC composite samples were enhanced. However, the NFA-SiC composites had relative lower hardness than the pure SiC samples. A carbon layer was introduced in the NFA particles to prevent the reaction between NFA and SiC. Results indicated that the carbon layer was effective up to 1050 degree C sintering temperature. Green samples of gradient-structured NFA-SiC composites were successfully fabricated through slip casting of an NFA-SiC co-suspension.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:8667en
dc.identifier.urihttp://hdl.handle.net/10919/81763en
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectnanostructured ferritic alloy (NFA)en
dc.subjectsilicon carbide (SiC)en
dc.subjectspark plasma sintering (SPS)en
dc.subjectdensityen
dc.subjectmicrostructureen
dc.subjecthardnessen
dc.titleStudies on Sintering Silicon Carbide-Nanostructured Ferritic Alloy Composites for Nuclear Applicationsen
dc.typeThesisen
thesis.degree.disciplineMaterials Science and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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