Preparation of Electrically Conductive Particles by Dry Coating and Evaluation of Fine Particle Dispersion

Abstract

Electrically conductive composite particles were prepared by dry coating of various types of electrically conductive fine powders on insulator resin. The course of composite formation and the state of dispersion were investigated by scanning electron microscope (referred to as SEM observation), X-ray elementary analysis and electrical property characterization.
Combining SEM observation and electrical property characterization determined the course of composite formation. The state of fine particle dispersion of the surface of a single composite particle could be quantitatively evaluated by calculating the coefficient of variance for the fine particles on the basis of elemental analysis of composite particles. Experiments also revealed that composite particles with excellent electric conductivity can be obtained, provided that the state of fine particle dispersion and coating on the core particle is good.