Estudo dos efeitos da substituição de Feldspato por Filito em massas de porcelanato

• Ano de defesa: 2018
• Autor(a) principal: Sanchez, Miguel Yesid Hernandez
• Orientador(a): Boschi, Anselmo Ortega
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Carlos; Câmpus São Carlos
• Programa de Pós-Graduação: Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM
• Palavras-chave em Português: Porcelanato; Filito cerâmico; Sericita; Fluxo viscoso; Gresificação
• Palavras-chave em Inglês: Porcelain tile; Phyllite; Sericite; Viscous flow; Gresification
• Palavras-chave em Espanhol: Porcelanato; Filito cerámico; Sericita; Flujo viscoso; Gresificación
• Área do conhecimento CNPq: ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::MATERIAIS NAO METALICOS; ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA
• Link de acesso: https://repositorio.ufscar.br/handle/20.500.14289/10829

Porcelain stoneware tiles, porcelanatos, present excellent technical and aesthetic characteristics. In Europe, the bodies used in the manufacture of porcelain and porcelanatos are based on the classic triaxial ceramic, clay, quartz and feldspar, and the latter plays the role of flux. Bodies of this type have been thoroughly studied. In Brazil, for various reasons, virtually all the industries that produce glazed porcelain stoneware tiles replaced feldspar by the phyllites. Although this practice, the replacement of feldspar by phyllites, has already occurred for some decades, the implications of this substitution have not been properly studied. The general objective of this work was to identify and seek explanations for the differences in behavior during firing caused by the substitution of feldspar by phyllite in the bodies used in the manufacture of glazed porcelain stoneware tiles. For this, the raw materials alone, feldspar and phyllites, as well as bodies containing the same content of these raw materials, were evaluated comparatively. Based on the results produced by several characterization techniques, among them the gresification curves and the chemical composition of the vitreous phases after the firing, the following conclusions were reached: 1) the behavior of the raw materials, feldspar and phyllites during firing are quite different; 2) different phyllites exhibit significantly different behavior during firing; 3) the differences in behavior between the phyllites is mainly due to the variation of the sericite content (muscovite fine-grained mica); 4) the behavior of pure raw materials is transferred to the masses which contain them.; 5) although the minerals responsible for forming the liquid phase during firing are significantly different, a mixture of feldspar, albite and orthoclase, and sericite, the chemical compositions of the vitreous phases formed are similar; 6) the volume of liquid phase during sintering seems to be one of the main variable responsible for the observed differences in the behaviour during firing.