Characterization of Microporous Ceramics Based on Calcium Hexaluminate “In Situ” Produced by Direct Molding

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dc.contributor.authorLeite, Vitória Marques Cesar
dc.contributor.authorSalomão, Rafael
dc.contributor.authorCardoso, Gustavo Luiz Bueno
dc.contributor.authorOrtega, Fernando dos Santos
dc.contributor.authorOliveira, Ivone Regina de
dc.date.accessioned2026-01-14T12:36:12Z
dc.date.available2026-01-14T12:36:12Z
dc.date.issued22024
dc.description.abstractCalcium hexaluminate (CA6) presents a wide application in high-temperature thermal insulation. Despite the high porosity levels achieved, the use of carbonated precursors in its synthesis inevitably produces CO2 as a by-product. CA6 was produced by combining different sources of alumina (α-Al2O3 and ρ-Al2O3) and lime (CaCO3, Ca(OH)2, and CaO) in aqueous suspensions that were cast and sintered to evaluate these routes on its physical properties. The products attained after sintering at 1550 and 1600 °C were characterized for crystal phases, real density, particle morphology, uniaxial compressive strength, apparent porosity, and pore size distribution. Part of the samples sintered at 1600 °C was subjected to a thermal shock test and was then evaluated for residual strength under diametrical compression, apparent porosity, pore size distribution, and flexural elastic modulus. The CA6 samples produced from α-Al2O3 presented lower pore fraction and higher mechanical strength and modulus of elasticity. The superior properties of the materials produced with α-alumina were maintained after thermal shock. The acicular geometry of the CA6 particles is related to their excellent thermal shock resistance and mechanical performance. The results indicated a more environmentally friendly system produced from α-Al2O3-CaO for industrial applications of high-temperature thermal insulation resistant to thermal shock damage.
dc.description.physical11 p.
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFinanciadora de Estudos e Projetos (Finep)
dc.description.uriFAPESP: 2015/01541-0, 2010/19274-5
dc.format.mimetypePDF
dc.identifier.affiliationUniversidade do Vale do Paraíba
dc.identifier.affiliationUniversidade de São Paulo
dc.identifier.bibliographicCitationLEITE, V. M. C. et al. Characterization of Microporous Ceramics Based on Calcium Hexaluminate “In Situ” Produced by Direct Molding. Materials Research, v. 27, p. 1-11, 2024. Disponível em: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392024000100301&tlng=en.
dc.identifier.doi10.1590/1980-5373-mr-2024-0211
dc.identifier.urihttps://repositorio.univap.br/handle/123456789/1086
dc.language.isoen_US
dc.publisherUniversidade Federal de São Carlos
dc.rights.holderMaterials Research
dc.subject.keywordPorous ceramics
dc.subject.keywordCalcium hexaluminate
dc.subject.keywordDirect casting
dc.subject.keywordAlumina sources
dc.subject.keywordCalcium oxide sources
dc.titleCharacterization of Microporous Ceramics Based on Calcium Hexaluminate “In Situ” Produced by Direct Molding
dc.typeArtigos de Periódicos

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