PLASMA AND HYPERSONIC FLAME SPRAYED CERAMIC COATINGS FOR DIELECTRICAL APPLICATIONS

摘要

Oxide ceramics play a major role as dielectric materials for the use in barrier discharge applications. Refractory oxides with high melting points can be processed to functional coatings in a performing and cost effective way using thermal spray technologies. Incompatibility problems of the thermophysical properties of such coatings on metal, glas and polymer substrates can be solved by selective thermal spray parameter variation and simultaneous cooling to obtain appropriate residual stresses in the layer composite. Thermophysical and electrophysical properties of such coatings, e.g. the dielectric behaviour in barrier discharge of coated tubular ozone generators are shown and results for various oxides (alumina, zirkonia, titania) are discussed. The influence of different thermal spray techniques, i. e. plasma spraying (APS) and hypersonic flame spraying (HVOF) onto the physical properties of the thermally sprayed coatings will be presented.