Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/3571
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dc.contributor.advisorÇiftçioğlu, Muhsinen
dc.contributor.authorKoçlar, Galip Sarper-
dc.date.accessioned2014-07-22T13:51:50Z-
dc.date.available2014-07-22T13:51:50Z-
dc.date.issued2013en
dc.identifier.urihttp://hdl.handle.net/11147/3571-
dc.descriptionThesis (Master)--Izmir Institute of Technology, Materials Science and Engineering, Izmir, 2013en
dc.descriptionIncludes bibliographical references (leaves: 53-55)en
dc.descriptionText in English; Abstract: Turkish and Englishen
dc.descriptionx, 60 leavesen
dc.description.abstractIn this study, use of gelatin and carrageenan gum as gel formers in gelcasting process of alumina ceramics was aimed. The effects of each gel former on the mechanical properties of gelcasted alumina ceramics were distinctly investigated. Firstly, an experimental design was made according to pre-experimental studies and researches. In this experimental design, it was determined what the factors should be and how the levels of factors should change. Two groups of gelcasting slips were prepared with alumina powder. One of them was the group that contained gelatin with changing ratios from 3 to 6 wt%. Other was the group that contained carragenan gum with changing ratios from 1 to 2 wt%. Alumina powder amounts of the slips in also each group were the same and changing from 47 to 53 vol%. Furthermore, in order to see the direct effect of each gel former type and amount on mechanical properties and compare the methods of gelcasting and slip casting, alumina slips that contained no gelatin or carrageenan gum were also prepared. Green alumina samples in suitable shapes for mechanical tests were obtained by gelcasting method from the prepared slips. After green samples were dried, half of them were sintered at 1550 oC. Rest of them weren’t subjected to any heat treatment. Green samples in block shape were cut in suitable dimensions for 3-point bending test before they were sintered. Shrinkage and densification ratios of the alumina samples after drying and sintering were measured and calculated. At the end of the mechanical tests applied on green and sintered alumina ceramics, data about change in their bending strength, compressive strength and hardness values due to varying gel amount and sintering were obtained. These data were analyzed, then the obtained results were interpreted. While optimum gel former amount needed for maximum compressive and bending strength of gelatin-gelcasted alumina samples was 5 wt%., this amount for that of gum-gelcasted alumina samples was 1.7 wt%. The effect of alumina solid loading on mechanical properties of gelcasted alumina samples was unclear. After sintering of gelatin-gelcasted alumina samples, the densification reached to a maximum of 95.80%.en
dc.language.isoenen_US
dc.publisherIzmir Institute of Technologyen
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subject.lcshCeramic materials--Mechanical propertiesen
dc.subject.lcshAluminum oxideen
dc.subject.lcshOxide ceramicsen
dc.subject.lcshGelatinen
dc.titleGelcasting of alumina ceramics with gelatin and carrageenan gum and investigation of their mechanical propertiesen_US
dc.typeMaster Thesisen_US
dc.institutionauthorKoçlar, Galip Sarper-
dc.departmentThesis (Master)--İzmir Institute of Technology, Materials Science and Engineeringen_US
dc.relation.publicationcategoryTezen_US
item.openairetypeMaster Thesis-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
item.languageiso639-1en-
item.cerifentitytypePublications-
item.grantfulltextopen-
Appears in Collections:Master Degree / Yüksek Lisans Tezleri
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