Combined effects of SiO2 ratio and purity on physical properties and microstructure of in situ alumina-mullite ceramic

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorInternational Iberian Nanotechnology Laboratory (INL)-
Autor(es): dc.creatorSalomão, Rafael-
Autor(es): dc.creatorFernandes, Leandro [UNESP]-
Autor(es): dc.creatorSpera, Natalia C. M.-
Data de aceite: dc.date.accessioned2022-02-22T00:45:52Z-
Data de disponibilização: dc.date.available2022-02-22T00:45:52Z-
Data de envio: dc.date.issued2021-06-25-
Data de envio: dc.date.issued2021-06-25-
Data de envio: dc.date.issued2020-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1111/ijac.13733-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/205986-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/205986-
Descrição: dc.descriptionThe in situ formation of mullite (Al6Si4O13) is a complex process based on solid-state reactions strongly affected by the characteristics of Al2O3 and SiO2 sources. This study investigated the combined effects of variable SiO2/Al2O3 ratios and the presence of low-melting-point impurities on the physical properties and microstructure of in situ alumina-mullite ceramics. Two grades of synthetic amorphous silica, known as microsilica, of similar physical properties and significant differences in the content of alkali-based impurities (0.8 and 3.6 wt%), were combined with thin calcined alumina particles in different proportions (from silica-free up to stoichiometric mullite), pressed and sintered. The samples were tested for total porosity, flexural strength, and pore size distribution, and their crystalline phases and microstructures formed were investigated. Small amounts of both microsilica grades (up to 8.9 wt%) hindered the densification of the alumina-mullite matrix and favored grain growth events, increasing porosity and reducing strength. For samples containing higher microsilica loads (16.4–28.2 wt%), the impurities content significantly affected the amount of liquid phases formed. Such impurities altered the ratio and shape of the pores and the total amount of mullite after sintering. Therefore, different microstructures and levels of flexural strength and total porosity were observed.-
Descrição: dc.descriptionMaterials Engineering Department São Carlos School of Engineering University of São Paulo-
Descrição: dc.descriptionDepartment of Dental Materials and Prosthodontics School of Dentistry São Paulo State University (UNESP)-
Descrição: dc.descriptionInternational Iberian Nanotechnology Laboratory (INL)-
Descrição: dc.descriptionDepartment of Dental Materials and Prosthodontics School of Dentistry São Paulo State University (UNESP)-
Idioma: dc.languageen-
Relação: dc.relationInternational Journal of Applied Ceramic Technology-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectcalcined alumina-
Palavras-chave: dc.subjectimpurities-
Palavras-chave: dc.subjectin situ reaction-
Palavras-chave: dc.subjectleaching treatment-
Palavras-chave: dc.subjectmicrosilica-
Palavras-chave: dc.subjectmullite-
Título: dc.titleCombined effects of SiO2 ratio and purity on physical properties and microstructure of in situ alumina-mullite ceramic-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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