Porous cordierite-based ceramics processed by starch consolidation casting ? microstructural analysis and mechanical behavior evaluation

M. L. SANDOVAL; M. H. TALOU; A. G. TOMBA M; M. A. CAMERUCCI; E. GREGOROVÁ; W. PABST

CERAMICS INTERNATIONAL

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2018 vol. 44 p. 3893 - 3903

0272-8842

Porous cordierite-based ceramics with different microstructuralfeatures and mechanical behavior were formed by starch consolidationcasting (SCC) using native potato and corn starches and sintered at 1275,1300 and 1330°C. The composition and microstructure of the ceramicmaterials were investigated via quantitative phase analysis using X-raydiffraction (with Rietveld refinement), the Archimedes method, mercuryporosimetry, scanning electron microscopy and optical microscopy withstereology-based image analysis. The mechanical behavior of samples wasevaluated by diametral compression tests at room temperature, 1000 and1100°C. The type of starch used and the sintering temperatures were themain factors determining the characteristics of the developed porousmicrostructures. Materials prepared with corn starch achieved the lowestporosity and the lowest values of mean chord length, mean pore distanceand pore throat size. Because of these features, these materials thuspresented, in general, higher values of elastic modulus, yield stress andultimate strength than those prepared with potato starch. Despite thepresence of a silicate glassy phase, both porous materials, mainly thoseprepared with corn starch, still enhanced the basic mechanical propertiesat high temperature due to the special combination of the porousmicrostructure features.