Preliminary study of obtaining porous alumina ceramics from the in natura rice husk

Reference	Presenter	Authors (Institution)	Abstract
17-047	Bianca de Almeida Fortes	Fortes, B.d.(Universidade Federal Fluminense); Ribeiro, G.C.(Universidade Federal Fluminense); da Silva, L.(Universidade Federal Fluminense); Castro, J.A.(Universidade Federal Fluminense); Ribeiro, S.(Escola de Engenharia de Lorena);	Rice husk is a large-scale agricultural waste that can be used to produce porous ceramics. Its composition, rich in silica, at high temperature reacts with alumina generating mullite, which contributes to the improvement of the thermal and mechanical properties of the produced ceramic. In this work, for the production of ceramics with different pore sizes, the rice husk was ground in an alumina ball mill to obtain 2 granulometric bands (65 ?m and 150 ?m). The mixture was then manually prepared in different proportions: 5, 15 and 30% of the calcined alumina weight. After mixing, the samples were pressed by uniaxial pressing and sintered at 1450°C for one hour. The density of the sintered samples varied between 1.52 and 2.70 g/cm3, while linear retraction varied between 13 and 18%. Microstructural analysis was performed to verify the formation of mullite around the pores, since the porosity varied between 24 and 54%. X-ray diffraction analysis were also performed to prove mullite formation.
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