2014 Volume 54 Issue 8 Pages 1823-1829
A study has been carried out to clarify the sintering behavior of silica filler sand. Sintering experiments were firstly conducted and the experimental data were compared with the thermodynamic calculations by FactSage and MELTS software.
It was found that sintering of the silica sand proceeded through the evolution of liquid phases, which were originated from alkali feldspars. The liquid proportion was found to increase with an increase in temperature. It wan considered that the viscous liquid phases connecting silica particles contributed to the strength of the sintered sand. The thermodynamic calculations revealed that MELTS software could sufficiently simulate the phases in equilibrium with each other. The comparison of the experimental data with the thermodynamic simulations demonstrated that the whole system of the silica sand did not attain equilibrium. It was hence inferred that filler sands should be designed to prevent the state fully sintered by controlling the particle size.