Preparation of Spherical Microfine Silicon Powder

SHENG Yong, ZOU Jun, LI Bing, TU Mingjing (College of Material Science and Engineering, Sichuan University, Chengdu 610065, China)

摘 要：Under certain conditions of proper temperature and pH value, sodium silicate was hydrolyzed in liquid ammonia chloride, and spherical microfine SiO2 powder in micrometer-size was prepared. In this experiment, the relationship between needed time and proper pH value, temperature, density of the solution, and its current capacity were found .The optimum conditions are pH 8.5, 70 ℃, and the concentration of sodium silicate is 0.6 mol/L for the density of the solution. The structure of spherical microfi ne silicon was charactetized by SEM and XRD.

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