Dispersion of glass powder and characterization of thick film for AC plasma display panels

Bi-based glass pastes were prepared in the mixed organic solvents (alpha-terpineol and texanol) with different kinds and concentrations of organic dispersant such as fish oil, phosphate ester and poly methyl methacrylate (PMMA). The rheological stability of glass pastes was characterized by using a rheometer and adsorption behavior of organic additives for the glass powders was carried out by using a thermal gravimetric analyzer (TGA). The Bi-based glass pastes exhibited the most stable rheological behavior at an addition of phosphate ester of 0.5 in mass %, due to the steric repulsive force acting on the surface of glass powers with adsorbing the organic additives. This study allowed significant delay of the sedimentation time and suppressed generation of micropores during practical forming process by a screen printing method.