{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/21108"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/21108","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Processing, mechanical properties, and microstructures of dicalcium silicate-calcium zirconate composites","abstract":"The two major aims of this research were: (1) to develop a chemical process for making Ca$\\sb2$SiO$\\sb4$ powder for composite preparation, and (2) to process the Ca$\\sb2$SiO$\\sb4$-CaZrO$\\sb3$ composite through microstructural engineering to improve mechanical properties and to correlate these properties to microstructures. Pure CaZrO$\\sb3$ was also studied in parallel.","abstract_html":"The two major aims of this research were: (1) to develop a chemical process for making Ca$\\sb2$SiO$\\sb4$ powder for composite preparation, and (2) to process the Ca$\\sb2$SiO$\\sb4$-CaZrO$\\sb3$ composite through microstructural engineering to improve mechanical properties and to correlate these properties to microstructures. Pure CaZrO$\\sb3$ was also studied in parallel.","abstract_has_math":true,"creators":["Hou, Tien-I"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Materials Engineering","degree_department":null,"school":null,"contributors":["Kriven, Waltraud M."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:58:38Z","date_published":"2011-05-07T12:58:38Z","updated_at":"2026-07-22T22:25:17Z","subjects":["Engineering, Materials Science"],"languages":["eng"],"rights":["Copyright 1991 Hou, Tien-I"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9210842","(UMI)AAI9210842"],"render_values":[{"text":"AAI9210842","href":null,"code":true},{"text":"(UMI)AAI9210842","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/21108","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Kriven, Waltraud M."]},{"key":"dc:creator","label":"Author","values":["Hou, Tien-I"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:58:38Z","10000-01-01","1991"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Materials Engineering"]},{"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 1991 Hou, Tien-I"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9210842","(UMI)AAI9210842","http://hdl.handle.net/2142/21108"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The two major aims of this research were: (1) to develop a chemical process for making Ca$\\sb2$SiO$\\sb4$ powder for composite preparation, and (2) to process the Ca$\\sb2$SiO$\\sb4$-CaZrO$\\sb3$ composite through microstructural engineering to improve mechanical properties and to correlate these properties to microstructures. Pure CaZrO$\\sb3$ was also studied in parallel.","For the first time, a modified Pechini method was successfully applied to fabricate Ca$\\sb2$SiO$\\sb4$ powder with high surface area of about 15 m$\\sp2$/g. The shape of Ca$\\sb2$SiO$\\sb4$ particles was irregular and each particulate consisted of many fine spherical particles.","The toughness of pure CaZrO$\\sb3$ was found to depend on its grain size. This was related to microcracking at the grain boundaries. The microcracking phenomenon was confirmed by the measurement of Young's modulus and by TEM observation.","Three types of microstructures were created in Ca$\\sb2$SiO$\\sb4$-CaZrO$\\sb3$ composites. The first type was Ca$\\sb2$SiO$\\sb4$ added as a second phase, the second consisted of a 50 vol.%-Ca$\\sb2$SiO$\\sb4$-50 vol.%-CaZrO$\\sb3$ mixture, and the third was a reverse of the first one. Results showed that the composite with the second type of microstructure had the highest toughness of about 4.0 MPa$\\cdot$m$\\sp{1/2}$, which was about double that of the base material. Microstructural observations indicated weak grain boundaries in CaZrO$\\sb3$ agglomerates and weak interfaces between the two phases. The toughening was considered to be mainly from crack deflection and microcracking.","Made available in DSpace on 2011-05-07T12:58:38Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9210842.pdf: 4713041 bytes, checksum: 1cba926369d9b442b3417e31b9886168 (MD5) Previous issue date: 1991","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:48:32Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:21:59-05:00 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"]},{"key":"dc:title","label":"Title","values":["Processing, mechanical properties, and microstructures of dicalcium silicate-calcium zirconate composites"]}]}],"canonical_facts":{"dc:contributor":["Kriven, Waltraud M."],"dc:creator":["Hou, Tien-I"],"dc:date":["2011-05-07T12:58:38Z","10000-01-01","1991"],"dc:description":["The two major aims of this research were: (1) to develop a chemical process for making Ca$\\sb2$SiO$\\sb4$ powder for composite preparation, and (2) to process the Ca$\\sb2$SiO$\\sb4$-CaZrO$\\sb3$ composite through microstructural engineering to improve mechanical properties and to correlate these properties to microstructures. Pure CaZrO$\\sb3$ was also studied in parallel.","For the first time, a modified Pechini method was successfully applied to fabricate Ca$\\sb2$SiO$\\sb4$ powder with high surface area of about 15 m$\\sp2$/g. The shape of Ca$\\sb2$SiO$\\sb4$ particles was irregular and each particulate consisted of many fine spherical particles.","The toughness of pure CaZrO$\\sb3$ was found to depend on its grain size. This was related to microcracking at the grain boundaries. The microcracking phenomenon was confirmed by the measurement of Young's modulus and by TEM observation.","Three types of microstructures were created in Ca$\\sb2$SiO$\\sb4$-CaZrO$\\sb3$ composites. The first type was Ca$\\sb2$SiO$\\sb4$ added as a second phase, the second consisted of a 50 vol.%-Ca$\\sb2$SiO$\\sb4$-50 vol.%-CaZrO$\\sb3$ mixture, and the third was a reverse of the first one. Results showed that the composite with the second type of microstructure had the highest toughness of about 4.0 MPa$\\cdot$m$\\sp{1/2}$, which was about double that of the base material. Microstructural observations indicated weak grain boundaries in CaZrO$\\sb3$ agglomerates and weak interfaces between the two phases. The toughening was considered to be mainly from crack deflection and microcracking.","Made available in DSpace on 2011-05-07T12:58:38Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9210842.pdf: 4713041 bytes, checksum: 1cba926369d9b442b3417e31b9886168 (MD5) Previous issue date: 1991","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:48:32Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:21:59-05:00 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":["AAI9210842","(UMI)AAI9210842","http://hdl.handle.net/2142/21108"],"dc:language":["eng"],"dc:rights":["Copyright 1991 Hou, Tien-I"],"dc:subject":["Engineering, Materials Science"],"dc:title":["Processing, mechanical properties, and microstructures of dicalcium silicate-calcium zirconate composites"],"dc:type":["text"],"thesis:degree_discipline":["Materials Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:17Z"}