{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/23242"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/23242","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Processing, characterization, and mechanical properties of beta silicon nitride whisker/silicon nitride matrix composites","abstract":"Ceramic matrix composites, consisting of $\\beta$-$\\rm Si\\sb3N\\sb4$ whisker reinforced polycrystalline $\\rm Si\\sb3N\\sb4$, were fabricated with controlled whisker/matrix interfaces, characterized on the microstructural level, and evaluated for mechanical reliability. As-received and coated $\\beta$-$\\rm Si\\sb3N\\sb4$ whiskers were used to reinforce the $\\rm Si\\sb3N\\sb4$ matrices. Whisker coatings were achieved by low pressure chemical vapor deposition of BN. As-received and coated whiskers and as-received powders were characterized using XRD, XPS, SEM, and TEM techniques. Composite microstructures, including the whisker/matrix interfacial zones, were characterized by SEM and TEM. Mechanical properties of the composites, primarily fracture strength and fracture toughness, were measured and compared to those of the unreinforced matrices.","abstract_html":"Ceramic matrix composites, consisting of <span class=\"etd-inline-math\">&beta;</span>-$\\rm Si\\sb3N\\sb4$ whisker reinforced polycrystalline $\\rm Si\\sb3N\\sb4$, were fabricated with controlled whisker/matrix interfaces, characterized on the microstructural level, and evaluated for mechanical reliability. As-received and coated <span class=\"etd-inline-math\">&beta;</span>-$\\rm Si\\sb3N\\sb4$ whiskers were used to reinforce the $\\rm Si\\sb3N\\sb4$ matrices. Whisker coatings were achieved by low pressure chemical vapor deposition of BN. As-received and coated whiskers and as-received powders were characterized using XRD, XPS, SEM, and TEM techniques. Composite microstructures, including the whisker/matrix interfacial zones, were characterized by SEM and TEM. Mechanical properties of the composites, primarily fracture strength and fracture toughness, were measured and compared to those of the unreinforced matrices.","abstract_has_math":true,"creators":["Neergaard, Lynn James"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Applied Mechanics","degree_department":null,"school":null,"contributors":["Homeny, J."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T14:07:13Z","date_published":"2011-05-07T14:07:13Z","updated_at":"2026-07-22T22:25:21Z","subjects":["Applied Mechanics","Engineering, Materials Science"],"languages":["eng"],"rights":["Copyright 1990 Neergaard, Lynn James"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9114360","(UMI)AAI9114360"],"render_values":[{"text":"AAI9114360","href":null,"code":true},{"text":"(UMI)AAI9114360","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/23242","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Homeny, J."]},{"key":"dc:creator","label":"Author","values":["Neergaard, Lynn James"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T14:07:13Z","10000-01-01","1990"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Applied Mechanics","Engineering, Materials Science"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Applied Mechanics","Engineering, Materials Science"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1990 Neergaard, Lynn James"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9114360","(UMI)AAI9114360","http://hdl.handle.net/2142/23242"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Ceramic matrix composites, consisting of $\\beta$-$\\rm Si\\sb3N\\sb4$ whisker reinforced polycrystalline $\\rm Si\\sb3N\\sb4$, were fabricated with controlled whisker/matrix interfaces, characterized on the microstructural level, and evaluated for mechanical reliability. As-received and coated $\\beta$-$\\rm Si\\sb3N\\sb4$ whiskers were used to reinforce the $\\rm Si\\sb3N\\sb4$ matrices. Whisker coatings were achieved by low pressure chemical vapor deposition of BN. As-received and coated whiskers and as-received powders were characterized using XRD, XPS, SEM, and TEM techniques. Composite microstructures, including the whisker/matrix interfacial zones, were characterized by SEM and TEM. Mechanical properties of the composites, primarily fracture strength and fracture toughness, were measured and compared to those of the unreinforced matrices.","Made available in DSpace on 2011-05-07T14:07:13Z (GMT). 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As-received and coated $\\beta$-$\\rm Si\\sb3N\\sb4$ whiskers were used to reinforce the $\\rm Si\\sb3N\\sb4$ matrices. Whisker coatings were achieved by low pressure chemical vapor deposition of BN. As-received and coated whiskers and as-received powders were characterized using XRD, XPS, SEM, and TEM techniques. Composite microstructures, including the whisker/matrix interfacial zones, were characterized by SEM and TEM. Mechanical properties of the composites, primarily fracture strength and fracture toughness, were measured and compared to those of the unreinforced matrices.","Made available in DSpace on 2011-05-07T14:07:13Z (GMT). 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