Ceramic bodies for roofing tiles: characteristics and firing behavior

摘要

This work has for objective to study the characteristics and technological properties of a typical roofing tile ceramic body from the county of Campos of Goytacazes-RJ with other three ceramic bodies of recognized technical quality, coming from States of Santa Catarina and Piaui and of Portugal. The ceramic bodies were submitted to analysis of X-ray diffraction, chemical composition, DTA/TGA, particle size distribution and plasticity. Samples were made by uniaxial pressure at 20 MPa for firing in temperatures varying from 825 to 1075 deg C. The firing technological properties evaluated were: lineal shrinkage, water absorption and flexural strength (3 points). The results indicated that the ceramic body from Campos presents significant differences in the evaluated characteristics in comparison with the other ceramic bodies. Consequently, the ceramic body from Campos showed a different firing behavior with higher values of water absorption, flexural strength and lineal shrinkage.