Coating compositions, processes for depositing the same, and articles resulting therefrom
AssigneeKKF Corporation
InventorHarry Wilfred Kompanek
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Abstract
Ceramic dielectric coating compositions are disclosed as well as processes for depositing the coating compositions on a substrate and the coated article resulting therefrom. A ferroelectric or piezoelectric powder material such as the barium titanate type or lead zirconate-titanate type is mixed with a phosphate additive and water to form an acidic flowable mass with a consistency suitable for depositing by various means on a substrate. Depositing means include painting, dipping, spraying, and silk-screen techniques. After deposition on the substrate, the coating composition is dried, preferably at an elevated temperature, to form a composite article of the substrate with an adherent ferroelectric or piezoelectric coating composition thereon.
Claims37
A method for preparing a composite of a substrate with a dielectric ceramic coating composition adhered thereto comprising forming an acidic aqueous slurry at a pH of less than about 1 by admixing a finely divided dielectric ceramic material, a phosphate additive and water, depositing said slurry as a coating composition on the substrate and drying said composition at a temperature sufficient to adhere said composition to said substrate.
A coating composition comprising a ferroelectric or piezoelectric ceramic material which is selected from the group consisting of barium titanate materials, lead zirconate-titanate materials, and lead metaniobate materials, and a phosphate additive admixed therewith in an amount of from about 0.5 weight percent to about 60 weight percent wherein the composition is an acidic aqueous slurry at a pH of less than about 1.
A composite article comprising a substrate and a dried coating composition adhered thereon prepared from an acidic aqueous slurry comprising a ferroelectric or piezoelectric ceramic powder material and a phosphate additive in an amount of from about 0.5 weight percent to about 60 weight percent of said material.
Dependencies are inferred from the claim text.