Effect of Silica Nanoparticle Dispersion on Flexural Strength of Sand Mold with Sodium Silicate Binder

Sodium silicate solutions are used as an eco-friendly binder in the casting process. However, strength of sand molds using sodium is reduced because their low humidity resistance. In this study, silica nanoparticles were added to a solution with constant SiO2/Na2O ratio improve resistance inorganic binder. The effects dissolution times and particle size on flexural was also investigated. physiochemical properties binders characterized by viscometer, Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) scanning electron microscope (SEM). Sand for test prepared mixing artificial binders. addition viscosity water evaporation rate improved due increase ratio. increased increased, formation discrete aggregates high surface area. decreased enhanced Q2/Q3 Therefore, we suggest that will molds, varying time affects molds.