Influence of calcite on the microstructure and sintering properties of the porcelain ceramic tiles at low temperature

Abstract

Porcelain ceramic tiles are low-temperature prepared by introducing multiple fluxes. The multiple flux compositions are potash feldspar-sodium feldspar-lithium porcelain stone-calcite four flux system. Effects of calcite contents on the microstructure, sintering and mechanical properties of the samples are studied in a fast firing process. The sintering behaviors of the samples are evaluated by linear shrinkage, water absorption and bulk density. The fired samples are characterized by X-ray diffraction, scanning electron microscopy equipped with an energy dispersive X-ray spectroscopy and bending strength measurements. Well densification of the porcelain ceramic tiles is obtained at a low temperature 11301150°C. The sample prepared with 11% calcite exhibits higher shrinkage and bulk density, lower water absorption at a temperature of 1130°C. Higher bending strength at a composition containing at 11% calcite is due to appropriate densification and high anorthite, quartz and mullite crystallinity.

Effect of Different Firing Temperature on Thermal Conductivity of Ceramic Tiles

“…This trend can be explained by the increase in the formation of liquid phase that mainly originated from the feldspar. As temperature increase, it will cause both an increase in the quantity of liquid phase as well as decrease in liquid phase viscosity [9]. These two situations will help the liquid phase to assist the pore filling process and reduce the amount of porosity.…”

New insight into the modification of pore structure in porous ceramics prepared from fly ash rich in CaO

“…An addition of 0–50wt.% dolomite initially enlarged the average pore diameter from ∼8.17 μm to ∼12.98 μm and then decreased to ∼2.82μm, which was consistent with the change of the pore size distribution of ceramics. This phenomenon might be explained as follows: the release of CO 2 from decomposition of dolomite generated new pores, while higher dolomite addition could introduce more CaO and MgO (alkaline‐earth oxides) to decrease melt viscosity, thereby further promoting the flowability of the melt among pores and the formation of small‐size pores …”