Improving sintering by lowering the temperature of melt formation during firing

Abstract

Liquid sintering for ceramic products is the main process providing necessary properties: strength characteristics, density and porosity. In order to reduce energy consumption for the production of ceramic products it is important to obtain a melt at a lower temperature with a wide sintering interval. Clay raw materials natural composition provides the melt formation at the temperatures above 710° C. The fusible silicate triple eutectics composition, providing the melt formation at the temperatures below 500°C is found. The components for complex fusion additive have been determined. The influence of the amount of complex fusion additive on the dynamics of melt charge change on the basis of Locosovo loam was studied. It was found out that the refractory additive in the amount of 6 to 18.5% extends the sintering interval, reduces the temperature of formation of the refractory melt and provides a decrease in firing temperature by 100°C. The optimum quantity of complex fusible additive providing improvement of sintering of ceramic materials at the expense of decrease in temperature of melt formation during firing is revealed.