Crystallisation of PFA glasses

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dc.contributor.advisorHeckroodt, R Oen_ZA
dc.contributor.authorEmms, Sen_ZA
dc.date.accessioned2014-10-17T07:31:08Z
dc.date.available2014-10-17T07:31:08Z
dc.date.issued1994en_ZA
dc.descriptionBibliography: leaves 79-81.en_ZA
dc.description.abstractGlasses with various compositions, falling in the CaO-AI20rSi02 and MgO-CaOAI20rSi02 systems were made, using pulverised fuel ash and silica, hydrated lime, kaolin and magnesium carbonate. Titania or ferric oxide and chromia were used as nucleants. Various crystallisation heat treatments were carried out and the nucleation and crystallisation behaviour was studied. A minimum MgO:CaO was found to be necessary for bulk nucleation to occur. The activation energy for viscous flow decreased with increased MgO:CaO ratios. This was accompanied by an increase in the surface crystal growth rates and a decrease in the activation energy for surface crystal growth. Titania also lowered the activation energies for viscous flow and surface crystal growth and caused an increase in the surface crystal growth rates.en_ZA
dc.identifier.apacitationEmms, S. (1994). <i>Crystallisation of PFA glasses</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering. Retrieved from http://hdl.handle.net/11427/8485en_ZA
dc.identifier.chicagocitationEmms, S. <i>"Crystallisation of PFA glasses."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 1994. http://hdl.handle.net/11427/8485en_ZA
dc.identifier.citationEmms, S. 1994. Crystallisation of PFA glasses. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Emms, S AB - Glasses with various compositions, falling in the CaO-AI20rSi02 and MgO-CaOAI20rSi02 systems were made, using pulverised fuel ash and silica, hydrated lime, kaolin and magnesium carbonate. Titania or ferric oxide and chromia were used as nucleants. Various crystallisation heat treatments were carried out and the nucleation and crystallisation behaviour was studied. A minimum MgO:CaO was found to be necessary for bulk nucleation to occur. The activation energy for viscous flow decreased with increased MgO:CaO ratios. This was accompanied by an increase in the surface crystal growth rates and a decrease in the activation energy for surface crystal growth. Titania also lowered the activation energies for viscous flow and surface crystal growth and caused an increase in the surface crystal growth rates. DA - 1994 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1994 T1 - Crystallisation of PFA glasses TI - Crystallisation of PFA glasses UR - http://hdl.handle.net/11427/8485 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/8485
dc.identifier.vancouvercitationEmms S. Crystallisation of PFA glasses. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 1994 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/8485en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Mechanical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherApplied Scienceen_ZA
dc.titleCrystallisation of PFA glassesen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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