An Exploration of Factors Affecting the Preparation of SiO<sub>2</sub>-Coated α-Al<sub>2</sub>O<sub>3</sub> Pearlescent Pigment

Abstract

The SiO2-coated α-Al2O3 pearlescent pigment was prepared by liquid phase deposition (LPD). The effects of concentration of sodium silicate solution, reaction temperature and pH value of the aluminum oxide suspending liquid were systemically studied in this paper. The obtained samples were characterized by scanning electron microscopy (SEM). The results showed that when the process parameters are the concentration of sodium silicate solution of 0.1 mol/L, the reaction temperature of 80 °C and the pH value of 9.0, the high quality of SiO2-coated α-Al2O3 pearlescent pigment could be obtained.