Martinelli, Antonio EduardoMedeiros, S. G.Dutra, Ricardo Peixoto SuassunaGrilo, João Paulo de FreitasPaskocimas, Carlos AlbertoMacedo, Daniel Araújo de2021-02-222021-02-222016-09MEDEIROS, S. G.; DUTRA, R. P. S.; GRILO, J. P. F.; MARTINELLI, A. E.; PASKOCIMAS, C. A.; MACEDO, D. A.. Preparação de compósitos alumina-mulita de baixo custo via sinterização reativa entre uma argila caulinítica da Paraíba e hidróxido de alumínio. Cerâmica, [S.L.], v. 62, n. 363, p. 266-271, set. 2016. FapUNIFESP (SciELO). http://dx.doi.org/10.1590/0366-69132016623631992. Disponível em: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132016000300266&lng=pt&tlng=pt. Acesso em: 20 jan. 2021.1678-4553https://repositorio.ufrn.br/handle/123456789/31605This work aimed to evaluate the effects of processing on microstructure and properties of alumina-mullite composites via reactive sintering of a mixture of kaolinite clay and aluminum hydroxide. Cylindrical pellets were pressed at 40 MPa and sintered between 1300 and 1600 °C. The technological properties were determined as a function of sintering temperature. The evaluation of crystalline phases and microstructure was performed by X-ray diffraction and electron microscopy. Structural results indicate the attainment of mullite and alumina at 1300 °C. Apparent porosity below 0.8% and flexural strength higher than 40 MPa were obtained for sintering temperatures above 1450 °C. A flexural strength as high as 70 MPa was obtained after sintering at 1600 °C. This study demonstrates the possibility of preparing low cost alumina-mullite composites with technological properties compatible with those of ceramics produced by companies with large operations in the international market of refractory productsAttribution-NonCommercial 3.0 Brazilhttp://creativecommons.org/licenses/by-nc/3.0/br/CaulinitaMulitaAluminaMicroestruturaPropriedades tecnológicasPreparação de compósitos alumina-mulita de baixo custo via sinterização reativa entre uma argila caulinítica da Paraíba e hidróxido de alumínioPreparation of low-cost alumina-mullite composites via reactive sintering between a kaolinite clay from Paraíba and aluminum hydroxidearticle10.1590/0366-69132016623631992