Structural and fluid dynamic characterization of calcium carbonate-based porous ceramics

• Published in: Materials research (São Carlos, São Paulo, Brazil) Vol. 16; no. 6; pp. 1439 - 1448
• Main Author: SIMAO, Lisandro
• Format: Journal Article
• Language: English; Portuguese
• Published: ABM, ABC, ABPol 01-12-2013; Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
• Subjects: Calcium carbonate; Ceramics; ENGINEERING, CHEMICAL; Feldspars; Fluid dynamics; Heat treatment; Kaolin; Limestone; MATERIALS SCIENCE, MULTIDISCIPLINARY; METALLURGY & METALLURGICAL ENGINEERING; microporous materials; microstructure; Quartz; ceramics; microporous materials; microstructure
• ISSN: 1516-1439; 1980-5373; 1980-5373
• DOI: 10.1590/S1516-14392013005000147

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 [degrees]C. 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 [degrees]C (k sub(1)= 1.73X10 super(-13) m super(2) and k sub(2)= 1.00x10 super(-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.