High Temperature Corrosion of Single Crystal Sapphire and Zirconia in Coal Gasification and Commercial Glass Environments

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dc.contributor.authorDicic, Zoranaen
dc.contributor.committeecochairPickrell, Gary R.en
dc.contributor.committeecochairWang, Anboen
dc.contributor.committeememberKampe, Stephen L.en
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2011-08-06T16:02:33Zen
dc.date.adate2004-07-16en
dc.date.available2011-08-06T16:02:33Zen
dc.date.issued2001-05-10en
dc.date.rdate2004-07-16en
dc.date.sdate2004-05-27en
dc.description.abstractTo meet the requirements of precise temperature monitoring at high temperatures in extremely corrosive environments, such as in coal gasifiers, a new sensor technology has been developed. This optical, ultra high temperature measurement system utilizes single crystal sapphire as a sensing element. A series of experiments was performed to determine the corrosion resistance of single crystal sapphire and single crystal fully stabilized cubic zirconia at high temperatures in coal slag and soda lime glass. The amount of corrosion of sapphire and zirconia in corrosive slags was measured at 1200°C, 1300°C, and 1400°C for different exposure times. The microstructural features at the interface of sapphire and zirconia were investigated using SEM and EDX analysis. The experimental measurements as well as SEM micrographs show very little or no degradation of sapphire and zirconia samples in corrosive slags. An interesting phenomenon was observed in the EDX scans of sapphire in the coal slag: the iron from the slag appears to have completely separated from the silicon and deposited at the sapphire surface. This interesting observation can be further explored to study whether this iron layer can be used to control the corrosion of sapphire.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.otheretd-05272004-000606en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05272004-000606en
dc.identifier.urihttp://hdl.handle.net/10919/10004en
dc.publisherVirginia Techen
dc.relation.haspartZoranaDicic_thesis7-15.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectsapphireen
dc.subjectreaction kinetics.en
dc.subjectcorrosion rateen
dc.subjectcorrosionen
dc.subjectcoal gasifieren
dc.subjectcoal slagen
dc.subjectsoda lime glassen
dc.subjectaluminaen
dc.subjectzirconiaen
dc.titleHigh Temperature Corrosion of Single Crystal Sapphire and Zirconia in Coal Gasification and Commercial Glass Environmentsen
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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