Abstract
Al-rich sludge produced from an industrial anodising and surface treatment processes had been tested in the fabrication of mullite/alumina-based refractory materials, by using unidirectional dry pressing as shaping technique. Mixtures with common natural silica-containing materials, like ball clay, kaolin and/or diatomite were prepared in order to achieve interesting final fired refractory and/or electrical insulating compositions. Microstructural changes upon sintering and crystalline phase evolution are detailed and their relationship with the electrical behaviour is now studied, by the use of impedance spectroscopy.
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