Effect of the Dry Bulk Density on the Fired Properties of Clayey Ceramics

V. Scarpini; R.M. Pinheiro; S.N. Monteiro; C.M.F. Vieira

doi:10.4028/www.scientific.net/MSF.727-728.988

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HomeMaterials Science ForumMaterials Science Forum Vols. 727-728Effect of the Dry Bulk Density on the Fired...

Effect of the Dry Bulk Density on the Fired Properties of Clayey Ceramics

Abstract:

Densification of a precursor mixture of powders followed by drying to remove the excess of water is a necessary stage before the high temperature sintering to produce a ceramic piece. In the case of conventional red ceramics the influence of the density established during this stage has received limited attention in terms of the final product proprieties. Therefore, this work has for objective to evaluate the influence of the dry bulk density on the fired properties of red ceramics elaborated with the mixture of clays, argillite and grog. Cylindrical specimens were prepared with two different ranges of dry bulk density, 1.95-2.09 g/cm³ and 2.15-2.28 g/cm³. Specimens were fired at 1050°C in a laboratory furnace. The evaluated properties were: water absorption, diametral shrinkage and compressive strength. Microstructure of the fired ceramics was evaluated by electron scanning microscopy. Results showed that dry bulk density exercises a strong influence on the fired properties.