{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/23739"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/23739","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Heat treatment and additive effects on microstructure and properties of tetragonal-(2-3 mol%) yttria-stabilized-zirconia","abstract":"The role of selected additives (Al$\\sb2$O$\\sb3$, yttrium aluminum garnet (3Y$\\sb2$O$\\sb3$ $\\cdot$ Al$\\sb2$O$\\sb3$) and Zr) in microstructural development, phase stability and mechanical behavior of predominantly-tetragonal (2-3 mol%) yttria-stabilized-zirconia (YSZ) was investigated. Preliminary studies on compositional effects were studied in 2-3 mol% YSZ prepared from a mixed oxide powder. Microstructure-property relationships were then investigated as a function of heat treatment conditions in 3 mol% YSZ prepared from a commercially available co-precipitated powder. Additive effects on microstructure and mechanical properties were studied for optimized heat treatment schedules in the 3 mol% YSZ system. For the YSZ-Al$\\sb2$O$\\sb3$ system, microstructures developed from mechanical mixing of YSZ powder were compared with microstructures obtained from nitrate-synthesized powders.","abstract_html":"The role of selected additives (Al$\\sb2$O$\\sb3$, yttrium aluminum garnet (3Y$\\sb2$O$\\sb3$ $\\cdot$ Al$\\sb2$O$\\sb3$) and Zr) in microstructural development, phase stability and mechanical behavior of predominantly-tetragonal (2-3 mol%) yttria-stabilized-zirconia (YSZ) was investigated. Preliminary studies on compositional effects were studied in 2-3 mol% YSZ prepared from a mixed oxide powder. Microstructure-property relationships were then investigated as a function of heat treatment conditions in 3 mol% YSZ prepared from a commercially available co-precipitated powder. Additive effects on microstructure and mechanical properties were studied for optimized heat treatment schedules in the 3 mol% YSZ system. For the YSZ-Al$\\sb2$O$\\sb3$ system, microstructures developed from mechanical mixing of YSZ powder were compared with microstructures obtained from nitrate-synthesized powders.","abstract_has_math":true,"creators":["Baskaran, Suresh"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Engineering, Materials Science","degree_department":null,"school":null,"contributors":["Buchanan, Relva C."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T14:25:16Z","date_published":"2011-05-07T14:25:16Z","updated_at":"2026-07-22T22:25:22Z","subjects":["Engineering, Materials Science"],"languages":["eng"],"rights":["Copyright 1989 Baskaran, Suresh"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI8924766","(UMI)AAI8924766"],"render_values":[{"text":"AAI8924766","href":null,"code":true},{"text":"(UMI)AAI8924766","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/23739","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Buchanan, Relva C."]},{"key":"dc:creator","label":"Author","values":["Baskaran, Suresh"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T14:25:16Z","10000-01-01","1989"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["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":["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 1989 Baskaran, Suresh"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI8924766","(UMI)AAI8924766","http://hdl.handle.net/2142/23739"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The role of selected additives (Al$\\sb2$O$\\sb3$, yttrium aluminum garnet (3Y$\\sb2$O$\\sb3$ $\\cdot$ Al$\\sb2$O$\\sb3$) and Zr) in microstructural development, phase stability and mechanical behavior of predominantly-tetragonal (2-3 mol%) yttria-stabilized-zirconia (YSZ) was investigated. Preliminary studies on compositional effects were studied in 2-3 mol% YSZ prepared from a mixed oxide powder. Microstructure-property relationships were then investigated as a function of heat treatment conditions in 3 mol% YSZ prepared from a commercially available co-precipitated powder. Additive effects on microstructure and mechanical properties were studied for optimized heat treatment schedules in the 3 mol% YSZ system. For the YSZ-Al$\\sb2$O$\\sb3$ system, microstructures developed from mechanical mixing of YSZ powder were compared with microstructures obtained from nitrate-synthesized powders.","The strength-toughness relationships observed in the 3 mol% YSZ system were correlated with the grain size dependence of the mechanical properties. Grain sizes were optimized for either high toughness ($\\approx$10 MPa$\\surd$m) or high strengths ($\\approx$820 MPa). Results of this study also showed that, in these materials, phase-separation to the equilibrium tetragonal and cubic-related phases on prolonged heat treatment was accompanied by grain growth inhibition.","The role of Al$\\sb2$O$\\sb3$ in microstructural control was found to depend strongly on the mode of dispersion during processing. Although the final distributions of Al$\\sb2$O$\\sb3$ in YSZ microstructures were similar, grain growth was inhibited only in Al$\\sb2$O$\\sb3$-containing YSZ prepared from chemically-synthesized powders. Additions of up to 6.5 wt% Al$\\sb2$O$\\sb3$ resulted in less than $\\pm$15% variation in strength and toughness for all heat treatments studied. The intergranular dispersion of Al$\\sb2$O$\\sb3$ was accompanied by a decrease in conductivity in 3 mol% YSZ prepared from the commercially available powder. Addition of yttrium aluminum garnet (YAG) resulted in the formation of cubic-related phases, improved low-temperature phase stability and low strengths ($<$600 MPa). Optimum additions of Zr (2 wt%) to 3 mol% YSZ resulted in improvements in fracture toughness.","Made available in DSpace on 2011-05-07T14:25:16Z (GMT). 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Preliminary studies on compositional effects were studied in 2-3 mol% YSZ prepared from a mixed oxide powder. Microstructure-property relationships were then investigated as a function of heat treatment conditions in 3 mol% YSZ prepared from a commercially available co-precipitated powder. Additive effects on microstructure and mechanical properties were studied for optimized heat treatment schedules in the 3 mol% YSZ system. For the YSZ-Al$\\sb2$O$\\sb3$ system, microstructures developed from mechanical mixing of YSZ powder were compared with microstructures obtained from nitrate-synthesized powders.","The strength-toughness relationships observed in the 3 mol% YSZ system were correlated with the grain size dependence of the mechanical properties. Grain sizes were optimized for either high toughness ($\\approx$10 MPa$\\surd$m) or high strengths ($\\approx$820 MPa). Results of this study also showed that, in these materials, phase-separation to the equilibrium tetragonal and cubic-related phases on prolonged heat treatment was accompanied by grain growth inhibition.","The role of Al$\\sb2$O$\\sb3$ in microstructural control was found to depend strongly on the mode of dispersion during processing. Although the final distributions of Al$\\sb2$O$\\sb3$ in YSZ microstructures were similar, grain growth was inhibited only in Al$\\sb2$O$\\sb3$-containing YSZ prepared from chemically-synthesized powders. Additions of up to 6.5 wt% Al$\\sb2$O$\\sb3$ resulted in less than $\\pm$15% variation in strength and toughness for all heat treatments studied. The intergranular dispersion of Al$\\sb2$O$\\sb3$ was accompanied by a decrease in conductivity in 3 mol% YSZ prepared from the commercially available powder. Addition of yttrium aluminum garnet (YAG) resulted in the formation of cubic-related phases, improved low-temperature phase stability and low strengths ($<$600 MPa). Optimum additions of Zr (2 wt%) to 3 mol% YSZ resulted in improvements in fracture toughness.","Made available in DSpace on 2011-05-07T14:25:16Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 8924766.pdf: 6935192 bytes, checksum: af757e18875d7d0ebc5b7bfad195320f (MD5) Previous issue date: 1989","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:06:31Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:31:56-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI8924766","(UMI)AAI8924766","http://hdl.handle.net/2142/23739"],"dc:language":["eng"],"dc:rights":["Copyright 1989 Baskaran, Suresh"],"dc:subject":["Engineering, Materials Science"],"dc:title":["Heat treatment and additive effects on microstructure and properties of tetragonal-(2-3 mol%) yttria-stabilized-zirconia"],"dc:type":["text"],"thesis:degree_discipline":["Engineering, Materials Science"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:22Z"}