Abstract
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 °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 °C (
Highlights
Porous ceramic materials are of great industrial interest because of their unique properties over a wide temperature range, such as their high chemical inertness, low thermal conductivity, high compressive strength, and high hardness, among other properties
Alkaline earth oxides (CaO + MgO) were added by means of the addition of calcium carbonate, which was chosen to act as pore-generating agent
A study of the effect of calcium carbonate addition on a ceramic composition was performed to produce porous structures with sufficient permeability to allow their use in fluid dynamics applications
Summary
Porous ceramic materials are of great industrial interest because of their unique properties over a wide temperature range, such as their high chemical inertness, low thermal conductivity, high compressive strength, and high hardness, among other properties These properties make porous ceramics useful in a variety of applications, including filters[1], membranes[2], sensors[3], low-weight structural materials[4], insulators[5], biomaterials[6], and catalyst supports[7]. Porous ceramics based on silicon carbide (SiC) have recently received significant attention from researchers due to their excellent structural properties, high thermal shock resistance, high hardness, and mechanical and chemical stability, at high temperatures and in harsh environments Because of these properties, such materials have been considered promising candidates for use as catalyst supports, gas sensors, thermal insulators, and other related applications[9]. Because of their physicalchemical characteristics, porous ceramic materials can be used in environmental applications, such as sensing and the remediation of effluents through selective adsorption of chemical species[10], and in engineering processes as substitutes for metallic and polymeric materials, especially those used at high temperatures[11]
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