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Cordierite obtained from compositions containing kaolin waste, talc and magnesium oxide

2017; Elsevier BV; Volume: 44; Issue: 2 Linguagem: Inglês

10.1016/j.ceramint.2017.10.102

1873-3956

Ester Pires de Almeida, Igor Pinheiro de Brito, H. C. Ferreira, Hélio de Lucena Lira, Lisiane Navarro de Lima Santana, Gelmires de Araújo Neves,

Advanced ceramic materials synthesis

The purpose of this study was to obtain cordierite from compositions containing kaolin waste (with different particle-size distributions), talc and magnesium oxide, for use in the production of refractory and insulating materials. The samples were characterized by means of the following techniques: chemical analysis by X-ray fluorescence, X-ray diffraction, particle size analysis and thermogravimetric and differential thermal analysis. The microstructure of the samples was analyzed using scanning electron microscopy. Rectangular test specimens (50 mm × 15 mm × 5 mm) were prepared by uniaxial pressing (13.0 MPa), dried at 110 °C/24 h and sintered at temperatures of 950, 1050, 1150, 1250 and 1350 °C. The mineralogical analysis revealed the beginning of the formation of characteristic peaks of cordierite phase at 1250 °C, and more intense peaks were identified at 1350 °C. The morphological analysis revealed rose-like and hexagonal tube-like crystals.