T. Dan et al., APPLICATION OF FORCED ELECTRIFICATION FOR PREPARATION OF COMPLEX PARTICLES, Journal of intelligent material systems and structures, 8(8), 1997, pp. 658-662
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.