SciELO - Scientific Electronic Library Online

 
vol.55 issue335Incorporation of industrial laundry mud in the production of ceramic bricksThe utilization of the thermal lens technique for the analysis of thermal properties of transparent materials author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Cerâmica

Print version ISSN 0366-6913

Abstract

VIEIRA, C. M. F.; TEIXEIRA, S. S.  and  MONTEIRO, S. N.. Effect of the firing temperature on the properties and microstructure of red ceramic incorporated with grog. Cerâmica [online]. 2009, vol.55, n.335, pp. 332-336. ISSN 0366-6913.  http://dx.doi.org/10.1590/S0366-69132009000300014.

This work has the objective of evaluating the effect of the firing temperature on the properties and microstructure of a kaolinitic clay incorporated with up to 20 wt. % of grog. Cylindrical specimens uniaxially pressed under 20 MPa were prepared and fired at temperatures ranging from 500 to 1100 ºC in a laboratory furnace. The properties evaluated were bulk density, diametral shrinkage, water absorption and mechanical strength. The microstructure of the ceramics was evaluated by scanning electron microscopy and mercury porosimetry. The results showed that no significant changes occurred in the evaluated properties of the compositions upon firing between 500 and 900 ºC. For higher firing temperatures, an abrupt decrease in the porosity resulted in a decrease in water absorption and an increase in mechanical strength. The incorporation of 5 wt.% of grog practically did not alter the properties of the ceramic. However, it was observed that higher amounts of grog decreased the fired mechanical strength of the clayey ceramic.

Keywords : red ceramic; grog; microstructure; properties; waste; temperature.

        · abstract in Portuguese     · text in Portuguese     · pdf in Portuguese