Alkali attack on ceramic filters

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dc.contributor.authorVass, Raymond J.en
dc.contributor.departmentMaterials Engineeringen
dc.date.accessioned2014-03-14T21:33:42Zen
dc.date.adate2009-04-14en
dc.date.available2014-03-14T21:33:42Zen
dc.date.issued1990en
dc.date.rdate2009-04-14en
dc.date.sdate2009-04-14en
dc.description.abstractExperiments were performed to determine a suitable binder material for silicon carbide-based ceramic filter. These experiments included exposure of 42% and 60% alumina, aluminosilicates to potassium and sodium containing environments for the purpose of determining the phases that would form and to determine concentration profiles. In addition, thermodynamic calculations were performed to predict the phases that would form when the alkali reacted with the aluminosilicate. The results of the thermodynamic calculations indicated that the alkali compounds will react at temperatures as low as 800°C. The exposure experiments verified this result. The phases that formed during the sodium vapor exposures and confirmed the thermodynamic calculations and were as follows: 1. sodium metasilicate and a solid solution of sodium aluminum silicates and carnegieite and for potassium vapor exposure. 2. potassium disilicate, kaliophilite-nepheline, potassium aluminate, and 5K₂O-5Al₂O₃-8SiO₂. Experiments also revealed that penetration depth by alkali compounds was restricted to a region near the surface of the material when the combination of temperature and sodium concentration alowed a melt to form. The results also indicated that the 42% alumina, aluminosilicate had superior resistance to alkali attack than the 60% alumina, aluminosilicate at temperatures below 1225°C.en
dc.description.degreeMaster of Scienceen
dc.format.extentvii, 47 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-04142009-040442en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-04142009-040442/en
dc.identifier.urihttp://hdl.handle.net/10919/42062en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1990.V388.pdfen
dc.relation.isformatofOCLC# 23657953en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1990.V388en
dc.subject.lcshCeramic electric filtersen
dc.subject.lcshCoal -- Combustionen
dc.titleAlkali attack on ceramic filtersen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMaterials Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen
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