Patent ID: 6319421
Filing Date: 2001-11-20
Classification: B82Y,C01G,C01P,C04B

Abstract:
A method for producing ceramic oxide powder comprising the steps of:A) dissolving or uniformly dispersing a raw material of constituent ceramic elements in a solvent or dispersion medium, thereby preparing a solution or dispersed mixture containing said constituent ceramic elements;B) adding citric acid in said solution or dispersed mixture, in which said constituent ceramic elements are dissolved or dispersed, at least in an amount required to generate an oxidative-reductive combustion reaction with anions of said constituent ceramic elements, thereby preparing a mixed solution; andC) thermally treating said mixed solution at a temperature of 100 to 500.degree. C., thereby evaporating said solvent or dispersion medium while causing said citric acid to act as a reductive combustion aid after said evaporation of said solvent or dispersed medium, thereby generating a non-explosive oxidative-reductive combustion reaction with said anions of said constituent ceramic elements, so that said citric acid is removed as said combustion reaction proceeds, and ceramic oxide is produced without any scattering by virtue of heat generated during said combustion reaction, whereby ceramic oxide powder having a grain size of 5 .mu.m or less and exhibiting a uniform grain size distribution is finally produced.