Abstract
The authors previously proposed the concepts of powder particles assembly for the creation of multi-functional materials and undertook the development of fundamental techniques for the preparation of complex particles by forced electrification processing. The purpose of the present work is to develop materials with new functions by combining two kinds of reciprocally electrified particles. This paper reports a preparation method and the positive temperature coefficient of resistivity (PTCR) properties of complex particles consisting of semiconductive BaTiO3 granules and metallic indium powder particles.
The conclusions obtained from the present experiment are as follows:
(1) A vibrating cylindrical electrode can forced-electrify metal, semiconductor and insulator particles positively and negatively.
(2) When the reciprocally electrified particles are mixed in the same region at the same time, complex particles can be created by the electrostatically attractive force working between two kinds of particles.
(3) Indium-semiconductive BaTiO3 complex particles formed by this process offer a new PTCR material which can be used in arbitrary shapes by filling and packing or drawing and painting.
