Phase characterization in crystallized glasses in the Na2O.2CaO.3SiO2- Na2O.3CaO.6SiO2 pseudo-binary system
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Biblioteca Digital de Teses e Dissertações da USP |
Texto Completo: | https://www.teses.usp.br/teses/disponiveis/18/18158/tde-02012024-152039/ |
Resumo: | Glass-ceramics are of the highest relevance in the industry due to their wide variety of uses. Compared to their parent glass, their enhanced properties result from the rigorous microstructure control during the precursor glass crystallization. Remarkably, the Na2O-CaO-SiO2 system is of great interest in the glass industry, finding applications from conventional windows, packaging, and tableware to bioglasses in medicine, among several others. The crystallization kinetics of stoichiometric compositions in this system has been extensively studied. However, there is a lack of information on the phases crystallized in the combeitedevitrite (Na2O·2CaO·3SiO2-Na2O·3CaO·6SiO2) pseudo-binary system. In this work, the phase formation in stoichiometric and non-stoichiometric compositions in the combeitedevitrite pseudo-binary join was investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC), optical microscopy and, scanning electron microscopy (SEM). In moderate undercooling below the liquidus, combeite was the primary phase crystallizing in all glasses of non-stoichiometric compositions treated close to the temperature of crystallization onset (about 750 °C) determined by DSC. In a glass of eutectic composition (33.3 mol% devitrite), the devitrite was observed only above 810 °C in advanced stages of crystallization. The devitrite formation was accompanied by a decrease in the volume fraction of the combeite solid solution. In contrast, in a hyper-eutectic composition (50 mol% devitrite), devitrite nucleated heterogeneously and grew from the surface of combeite crystals immediately after the combeite formation. The decomposition of devitrite into wollastonite and liquid occurred above 1050 °C for glasses with compositions between 33.33 and 93.75 mol% devitrite. Only glasses in the hypo-eutectic section of the combeite-devitrite binary system presented homogeneous nucleation. For these compositions, the combeite solid solution formation was investigated by XRD. It is suggested that combeite solid solution occurs in the interval between 0 and 33.33 mol% devitrite. The microstructure assessment in glass-ceramics from combeite-devitrite pseudo-binary glass compositions sheds light on the phase formation in this system, which is relevant for theoretical and practical applications. |
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Phase characterization in crystallized glasses in the Na2O.2CaO.3SiO2- Na2O.3CaO.6SiO2 pseudo-binary systemCaracterização de fases em vidros cristalizados no sistema Na2O.2CaO.3SiO2-Na2O.3CaO.6SiO2cristalizaçãocrystallizationglassglass-ceramicsolid solutionsolução sólidavidrosvitrocerâmicasGlass-ceramics are of the highest relevance in the industry due to their wide variety of uses. Compared to their parent glass, their enhanced properties result from the rigorous microstructure control during the precursor glass crystallization. Remarkably, the Na2O-CaO-SiO2 system is of great interest in the glass industry, finding applications from conventional windows, packaging, and tableware to bioglasses in medicine, among several others. The crystallization kinetics of stoichiometric compositions in this system has been extensively studied. However, there is a lack of information on the phases crystallized in the combeitedevitrite (Na2O·2CaO·3SiO2-Na2O·3CaO·6SiO2) pseudo-binary system. In this work, the phase formation in stoichiometric and non-stoichiometric compositions in the combeitedevitrite pseudo-binary join was investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC), optical microscopy and, scanning electron microscopy (SEM). In moderate undercooling below the liquidus, combeite was the primary phase crystallizing in all glasses of non-stoichiometric compositions treated close to the temperature of crystallization onset (about 750 °C) determined by DSC. In a glass of eutectic composition (33.3 mol% devitrite), the devitrite was observed only above 810 °C in advanced stages of crystallization. The devitrite formation was accompanied by a decrease in the volume fraction of the combeite solid solution. In contrast, in a hyper-eutectic composition (50 mol% devitrite), devitrite nucleated heterogeneously and grew from the surface of combeite crystals immediately after the combeite formation. The decomposition of devitrite into wollastonite and liquid occurred above 1050 °C for glasses with compositions between 33.33 and 93.75 mol% devitrite. Only glasses in the hypo-eutectic section of the combeite-devitrite binary system presented homogeneous nucleation. For these compositions, the combeite solid solution formation was investigated by XRD. It is suggested that combeite solid solution occurs in the interval between 0 and 33.33 mol% devitrite. The microstructure assessment in glass-ceramics from combeite-devitrite pseudo-binary glass compositions sheds light on the phase formation in this system, which is relevant for theoretical and practical applications.As vitrocerâmicas possuem grande relevância na indústria devido à ampla variedade de utilizações. Suas propriedades resultam do controle rigoroso da microestrutura durante a cristalização do vidro precursor. O sistema Na2O-CaO-SiO2 é de grande interesse na indústria do vidro, encontrando aplicações desde janelas convencionais e embalagens até biovidros usados na medicina, entre vários outros. A cinética de cristalização de composições estequiométricas neste sistema foi extensivamente estudada. No entanto, há uma falta de informações sobre as fases cristalizadas no sistema pseudo-binário combeíta-devitrita (Na2O·2CaO·SiO2-Na2O·3CaO·6SiO2). Neste trabalho, a formação de fase em composições estequiométricas e não estequiométricas na junção pseudo-binária combeíta-devitrita foi investigada por difração de raios X (XRD), calorimetria diferencial de varredura (DSC), microscopia óptica e microscopia eletrônica de varredura (MEV). A combeíta foi a primeira fase cristalizada em todos os vidros de composições não estequiométricas tratados perto da temperatura de início da cristalização (cerca de 750 °C) determinada por DSC. Em um vidro de composição eutética (33,3 mol% devitrita), devitrita foi observada apenas acima de 810 °C, em estágios avançados de cristalização. A formação de devitrita foi acompanhada por uma diminuição na fração de volumétrica da solução sólida de combeíta. Em contraste, em uma composição hipereutética (50 mol% de devitrita), cristais de devitrita nuclearam heterogeneamente a partir da superfície da camada de combeíta. A decomposição da devitrita em wolastonita e líquido ocorreu acima de 1050 °C para vidros com composições entre 33,33 e 93,75 mol% de devitrita. Apenas vidros na seção hipoeutética do sistema binário combeíta-devitrita apresentaram nucleação homogênea. Para essas composições, a formação de solução sólida de combeíta foi investigada por XRD. Sugere-se que combeíta em solução sólida ocorra no intervalo entre 0 e 33,33 mol% de devitrita. Essas descobertas são relevantes para aplicações teóricas e práticas.Biblioteca Digitais de Teses e Dissertações da USPFerreira, Eduardo BelliniOliveira, Katherine Santos2021-12-10info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttps://www.teses.usp.br/teses/disponiveis/18/18158/tde-02012024-152039/reponame:Biblioteca Digital de Teses e Dissertações da USPinstname:Universidade de São Paulo (USP)instacron:USPLiberar o conteúdo para acesso público.info:eu-repo/semantics/openAccesseng2024-01-03T18:08:02Zoai:teses.usp.br:tde-02012024-152039Biblioteca Digital de Teses e Dissertaçõeshttp://www.teses.usp.br/PUBhttp://www.teses.usp.br/cgi-bin/mtd2br.plvirginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.bropendoar:27212024-01-03T18:08:02Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Phase characterization in crystallized glasses in the Na2O.2CaO.3SiO2- Na2O.3CaO.6SiO2 pseudo-binary system Caracterização de fases em vidros cristalizados no sistema Na2O.2CaO.3SiO2-Na2O.3CaO.6SiO2 |
title |
Phase characterization in crystallized glasses in the Na2O.2CaO.3SiO2- Na2O.3CaO.6SiO2 pseudo-binary system |
spellingShingle |
Phase characterization in crystallized glasses in the Na2O.2CaO.3SiO2- Na2O.3CaO.6SiO2 pseudo-binary system Oliveira, Katherine Santos cristalização crystallization glass glass-ceramic solid solution solução sólida vidros vitrocerâmicas |
title_short |
Phase characterization in crystallized glasses in the Na2O.2CaO.3SiO2- Na2O.3CaO.6SiO2 pseudo-binary system |
title_full |
Phase characterization in crystallized glasses in the Na2O.2CaO.3SiO2- Na2O.3CaO.6SiO2 pseudo-binary system |
title_fullStr |
Phase characterization in crystallized glasses in the Na2O.2CaO.3SiO2- Na2O.3CaO.6SiO2 pseudo-binary system |
title_full_unstemmed |
Phase characterization in crystallized glasses in the Na2O.2CaO.3SiO2- Na2O.3CaO.6SiO2 pseudo-binary system |
title_sort |
Phase characterization in crystallized glasses in the Na2O.2CaO.3SiO2- Na2O.3CaO.6SiO2 pseudo-binary system |
author |
Oliveira, Katherine Santos |
author_facet |
Oliveira, Katherine Santos |
author_role |
author |
dc.contributor.none.fl_str_mv |
Ferreira, Eduardo Bellini |
dc.contributor.author.fl_str_mv |
Oliveira, Katherine Santos |
dc.subject.por.fl_str_mv |
cristalização crystallization glass glass-ceramic solid solution solução sólida vidros vitrocerâmicas |
topic |
cristalização crystallization glass glass-ceramic solid solution solução sólida vidros vitrocerâmicas |
description |
Glass-ceramics are of the highest relevance in the industry due to their wide variety of uses. Compared to their parent glass, their enhanced properties result from the rigorous microstructure control during the precursor glass crystallization. Remarkably, the Na2O-CaO-SiO2 system is of great interest in the glass industry, finding applications from conventional windows, packaging, and tableware to bioglasses in medicine, among several others. The crystallization kinetics of stoichiometric compositions in this system has been extensively studied. However, there is a lack of information on the phases crystallized in the combeitedevitrite (Na2O·2CaO·3SiO2-Na2O·3CaO·6SiO2) pseudo-binary system. In this work, the phase formation in stoichiometric and non-stoichiometric compositions in the combeitedevitrite pseudo-binary join was investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC), optical microscopy and, scanning electron microscopy (SEM). In moderate undercooling below the liquidus, combeite was the primary phase crystallizing in all glasses of non-stoichiometric compositions treated close to the temperature of crystallization onset (about 750 °C) determined by DSC. In a glass of eutectic composition (33.3 mol% devitrite), the devitrite was observed only above 810 °C in advanced stages of crystallization. The devitrite formation was accompanied by a decrease in the volume fraction of the combeite solid solution. In contrast, in a hyper-eutectic composition (50 mol% devitrite), devitrite nucleated heterogeneously and grew from the surface of combeite crystals immediately after the combeite formation. The decomposition of devitrite into wollastonite and liquid occurred above 1050 °C for glasses with compositions between 33.33 and 93.75 mol% devitrite. Only glasses in the hypo-eutectic section of the combeite-devitrite binary system presented homogeneous nucleation. For these compositions, the combeite solid solution formation was investigated by XRD. It is suggested that combeite solid solution occurs in the interval between 0 and 33.33 mol% devitrite. The microstructure assessment in glass-ceramics from combeite-devitrite pseudo-binary glass compositions sheds light on the phase formation in this system, which is relevant for theoretical and practical applications. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-12-10 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://www.teses.usp.br/teses/disponiveis/18/18158/tde-02012024-152039/ |
url |
https://www.teses.usp.br/teses/disponiveis/18/18158/tde-02012024-152039/ |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
|
dc.rights.driver.fl_str_mv |
Liberar o conteúdo para acesso público. info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Liberar o conteúdo para acesso público. |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.coverage.none.fl_str_mv |
|
dc.publisher.none.fl_str_mv |
Biblioteca Digitais de Teses e Dissertações da USP |
publisher.none.fl_str_mv |
Biblioteca Digitais de Teses e Dissertações da USP |
dc.source.none.fl_str_mv |
reponame:Biblioteca Digital de Teses e Dissertações da USP instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Biblioteca Digital de Teses e Dissertações da USP |
collection |
Biblioteca Digital de Teses e Dissertações da USP |
repository.name.fl_str_mv |
Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
virginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.br |
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1809090294620094464 |