PRODUCTION OF FINE COMPLEX CERAMIC POWER, APPARATUS FOR PRODUCTION, THE SAME CERAMIC POWDER AND SOLID ELECTROLYTIC TYPE FUEL CELL CONTAINING THE SAME CERAMIC POWDER AS ELECTRODE MATERIAL

摘要

PURPOSE:To obtain fine complex ceramic powder which is solid spherical secondary particles formed by aggregating primary particles of materials by atomizing a mixture solution of plural materials into a mist, drying the resultant mist at a lower temperature than the thermal decomposition temperature of the materials and thermally decomposing the mist. CONSTITUTION:This method for producing fine complex ceramic powder is to introduce a material mixture solution (S) of two or more kinds into an atomizing chamber 2, operate ultrasonic oscillators 3 and 3, prepare a mist (M) having 1-20mum particle diameter, preheat the mist at 100 deg.C in the atomizing chamber 2, admit air which is a carrier gas from a gas inflow port 4 in the upper part of the atomizing chamber 2, move the preheated mist (M) in the interior of a quartz tube 5 communicating with the atomizing chamber 2, respectively regulate the heat source temperatures of heating zones (7A) and (7B) in an electric furnace 6 to 200 and 450 deg.C, initially gently dry the mist (M) by heating, regulate the heat source temperature of a heating zone (7C) to 800 deg.C which is the thermal decomposition temperature of the materials, thermally decompose the mist (M), successively move the mist (M) from the heating zones (7A) to (7B), (7C) and (7D), powder the mist, collect the resultant powder in an electric dust collector 8, calcine the powder at 1000 deg.C for 4 hr and pulverize the calcined powder.