Microstructure and Dielectric Nature of Plasma Sprayed Ultra Purity Aluminum Oxide Coatings

Plasma sprayed acid washed aluminum oxide coatings are prepared and their microstructural and dielectric properties are measured. The coatings are compared with that of commercial grade Aluminum oxide coatings. Coating thickness variation and use of various sealers is assessed to see their effect on improvement of the dielectric strength. Application of various sealers such as Metco AP, Metco ERS, and Dichtol and the effect of thickness variation on dielectric strength will be evaluated. Coatings will be characterized for their microstructure, dielectric properties, bond strength, porosity, and sealer percolation. Coating characteristics on various electronic substrates such as alumina, stainless steel, pure aluminum etc. will be evaluated and reported.