Patent ID: 6349455
Filing Date: 2002-02-26
Classification: B82Y,C01G,C01P,C04B,H01L,Y10T

Abstract:
Method for forming a piezoelectronic/electrostrictive film element at low temperature using electrophoretic deposition, the method comprising of the steps of:a) preparing a solution or a dispersed mixture containing constituent ceramic elements by dissolving or dispersing the raw material of constituent ceramic elements in a solvent or a dispersion medium; b) preparing a mixed solution by adding citric acid into said solution or said dispersed mixture in which said constituent ceramic elements are dissolved or dispersed; c) getting ultrafine ceramic oxide powder of particular size less than 1 &mgr;m with uniform particle diameter size distribution by forming ceramic oxide without scattering over, by a nonexplosive oxidative-reductive combustion reaction by thermally treating said mixed solution at 100-500Â° C.; d) preparing a suspension by dispersing said ultrafine ceramic oxide powder in an organic dispersant; e) preparing ceramic sol solution by dissolving constituent ceramic elements of the same or similar constituent with said ultrafine ceramic oxide powder in water or an organic solvent; f) dispersing by mixing said suspension in which said ultrafine ceramic oxide powder is dispersed with said ceramic sol solution; g) forming a piezoelectric/electrostrictive film element by submerging a substrate into said suspension which said ultrafine ceramic oxide powder and said ceramic sol solution are mixed and then by performing electro-phoretic deposition; and h) thermally treating said piezoelectric/electrostrictive film element at 100-600Â° C., so that said solvent is removed by said thermal treatment and bonding among said ultrafine ceramic oxide powder particles is induced while said ceramic sol acts as a reaction medium on the surfaces of said ceramic oxide particles.