APPLICATION OF FORCED ELECTRIFICATION FOR PREPARATION OF COMPLEX PARTICLES

The purposes of the present work are to describe the importance of the application of forced electrification on complex particle preparation and to develop new materials with multiple functions by combining two kinds of particles electrified reciprocally. This paper reports a pre paration method and the positive temperature coefficient of resistivit y (PTCR) characteristics of composites consisting of semiconductive Ba TiO3 particles and metallic indium powder. The forced electrification technique was applied to a complex particle preparation process and co nfirmed to be effective as follows: 1. A vibrating cylindrical electro de can force-electrify metal, semiconductor and insulator particles wi th positive or negative charges. 2. When two kinds of particles electr ified reciprocally are mixed in the same region at the same time, comp lex particles can be produced by the electrostatically attractive forc e working between them. 3. Indium-semiconductive BaTiO, complex partic les made with this processing offer a new PTCR material which can be u sed in arbitrary shapes by simple packing. This behavior cannot be acc omplished by the conventionally sintered PTCR materials.