Porous mullite ceramics, obtained through reactive sintering of alumina and electrofused mullite, to use in high temperatures

Reference Presenter Authors
(Institution)
Abstract
17-048 Vera Lúcia Arantes Arantes, V.L.(Universidade de São Paulo); Sousa, L.L.(Universidade Federal de Alfenas - Campus de Poços de Caldas); Salomão, R.(Universidade de São Paulo); Porous ceramics have been used in a variety of technological applications, such as furnace and aircraft coatings, solid particle collectors, high temperature thermal insulation, filters for the automotive industry, glass production, acoustic insulation and as material burners. The alumina-silica system is widely used in refractories, as it generates mullite on site. Mullite is a crystalline phase commonly used in refractory ceramics because it exhibits excellent properties such as: high refractoriness and high modulus of rupture, good resistance to thermal shock, erosion and chemical attack. In this work, porous structures prepared from calcined alumina, aluminum hydroxide and hydratable alumina (inorganic hydraulic binder) received different amounts of electro-fused and microsilica mullite in order to generate different percentages of mullite during initial heating and sintering. Sintered samples obtained between 1100ºC and 1500ºC were characterized. Their mechanical properties were related to the characterization of the microstructure of the composite obtained. Finally, it was analyzed that which is the best system to use as thermal insulation.
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