2016
DOI: 10.1590/0366-69132016623642030
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Estudo de novas ocorrências de argilas plásticas (ball clays) do nordeste do Brasil para uso em cerâmicas refratárias

Abstract: Resumo A região nordeste do Brasil possui grandes depósitos de argilas plásticas do tipo ball clay situados geralmente na Formação Barreiras e são usados em cerâmica branca e materiais refratários. Essas argilas são constituídas por caulinitas secundárias e matéria orgânica, sendo muito plásticas e quando submetidas a elevadas temperaturas queimam com cores brancas e ocorrem transformações de fases, principalmente formação de cristais de mulita e cristobalita. Este trabalho tem como objetivo estudar novos jazi… Show more

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Cited by 5 publications
(7 citation statements)
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“…The chemical composition was evaluated by inductively coupled plasma atomic emission spectroscopy (ICP-AES), after triacid [30]. The effect of heat treatment was evaluated by thermogravimetric and differential thermal analysis (TG-DTA) simultaneously carried out in a Rigaku Evo II equipment with 10 °C/min as the heating rate in Pt crucible, in air atmosphere [31,32]. To understand the sintering behavior, thermomechanical analysis (TMA) on vertical prismatic (20.0x3.5x3.5 mm 3 ) sample was performed; this was performed with 10 °C/min heating rate in an air atmosphere (Rigaku, Evo Plus II, Japan).…”
Section: Methodsmentioning
confidence: 99%
“…The chemical composition was evaluated by inductively coupled plasma atomic emission spectroscopy (ICP-AES), after triacid [30]. The effect of heat treatment was evaluated by thermogravimetric and differential thermal analysis (TG-DTA) simultaneously carried out in a Rigaku Evo II equipment with 10 °C/min as the heating rate in Pt crucible, in air atmosphere [31,32]. To understand the sintering behavior, thermomechanical analysis (TMA) on vertical prismatic (20.0x3.5x3.5 mm 3 ) sample was performed; this was performed with 10 °C/min heating rate in an air atmosphere (Rigaku, Evo Plus II, Japan).…”
Section: Methodsmentioning
confidence: 99%
“…Observou-se que o quartzo foi majoritário nas amostras A e C. Para as amostras B, D, E e F observouse baixo percentual de cristobalita e elevada quantidade de mulita, sendo o valor máximo de 54,25% (amostra F). Isto pode estar relacionado com a importância da fase líquida no processo de cristalização da mulita [53]. Pôde-se verificar que praticamente todas as amostras apresentaram cristalinidade superior a 83%, com exceção a amostra F que foi de 78,7% na temperatura de 1200 ºC.…”
Section: Diâmetro (µM)unclassified
“…The highest percentages of the particles with an equivalent diameter lower than 2 μm, 57.8% and 40.5%, respectively, were found in LB and ST clays while that of the reference SS clay was 38.8%. Plastic materials used in the manufacturing of white ceramics need to have high amount of fine particles because they are responsible for the good finishing, favor sintering kinetics and the development of mullite [23]. Moreover, the green/dry strength of ball clays is closely related to particle size.…”
Section: Methodsmentioning
confidence: 99%