PREPARATION OF BARIUM TITANATE USING NEW RAW MATERIALS

摘要

PURPOSE: A preparation method of barium titanate powder by hydrothermal synthesis is provided, which prevents corrosion of powder preparation equipment and lowers production cost by using Ba and Ti hydroxides as raw materials instead of conventional raw materials containing chlorides. CONSTITUTION: The continuous preparation method of fine and homogeneous BaTiO3 powder through hydrothermal process comprises the steps of: (i) mixing barium hydroxide, Ba(OH)2-8H2O, with titanium hydroxide, TiO(OH)2 in a concentration ratio of 0.5-2 : 1 under pressure of 10-40MPa, which is expressed by the formula TiO(OH)2 + Ba(OH)2-8H2O -->BaTiO3 +10H2O; (ii) supplying hot water to the mixture for 100-400deg.C of mixture; (iii) reacting 3-10sec. to form critical nuclei; (iv) supplying hot water to the intermediates forming critical nuclei, and dehydrating under subcritical and supercritical state to get BaTiO3; (v) separating synthesized materials and recycling.