Structural and fluid dynamic characterization of calcium carbonate-based porous ceramics
AUTOR(ES)
Simão, Lisandro, Montedo, Oscar Rubem Klegues, Paula, Marcos Marques da Silva, Silva, Luciano da, Caldato, Rafael Falchi, Innocentini, Murilo Daniel de Mello
FONTE
Mat. Res.
DATA DE PUBLICAÇÃO
10/09/2013
RESUMO
The aim of this work was to experimentally evaluate the use of calcium carbonate as a pore-generating agent in ceramic compositions. Compositions that contained 50% kaolin, 20% limestone, and different concentrations of quartz and feldspar were prepared by uniaxial pressing. Samples were heat-treated at a heating rate appropriate to induce calcium carbonate degassing, and they were then sintered at 800, 900, and 1050 ºC. Tests of X-ray fluorescence, thermogravimetric analysis, porosimetry, and air permeation were performed. The composition (wt%) that contained 50% kaolin, 20% limestone, 20% feldspar, and 10% quartz and heat treated at 1050 ºC (k1 = 1.73×10-13 m² and k2 = 1.00×10-8 m) showed the highest level of permeability among the investigated samples. Fluid dynamics simulations showed that the prepared samples would exhibit a pressure drop greater than the range desired for applications that involve the filtration of aerosols, but alternatively would be suitable as substrates for asymmetric membranes in microfiltration applications.
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