Method of preparing ceramic microspheres

Details Method of preparing ceramic microspheres Method of preparing ceramic microspheres

1991-01-04

1991-12-10

Morris, Theodore

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

501 1, 501 33, 501103, C01B 1318

Patent

active

050716352

ABSTRACT:
A manufacturing method for ceramic microspheres including the steps of; mixing an oil which is immiscible with an aqueous solution of a water-soluble metallic compound and which has a boiling point higher than that of water in the aqueous solution; applying ultrasonic vibration to the mixed solution to form a water-in-oil type emulsion; heating the emulsion at a temperature less than a boiling point of water to evaporate free water from droplets in which the water-soluble metallic compound is dissolved and to disperse spherical particles of the water-soluble metallic compound in the oil phase; and thereafter heating the dispersed solution at a temperature higher than the temperature at which the water-soluble metallic compound is decomposed to form a metallic oxide but lower than the temperature at which grain growth in the metallic oxide starts, to evaporate and decompose the oil and to remove the oil therefrom, thereby obtaining the metallic oxide microspheres.

REFERENCES:
patent: 3617584 (1971-11-01), Flack et al.
patent: 4654048 (1987-03-01), Braun et al.
patent: 4746468 (1988-05-01), Ozaki et al.

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