Partially crystallizing ceramic enamel composition containing bismuth silicate, and use thereof
AssigneeCerdec Corporation
InventorsGeorge E. Sakoske, Joseph W. Ryan
Life of this patent
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Abstract
A ceramic enamel composition consists of an oxide frit, a bismuth silicate seed material, a pigment, and a vehicle. A preferred bismuth silicate seed material is selected from crystalline Bi12SiO20, Bi4(SiO4)3, and Bi2SiO5, and mixtures thereof. Upon firing a glass substrate coated with the enamel, components of the enamel adhere to the substrate. The glass can be formed with a die to a desired shape with reduced sticking of the coated region to the die. The ceramic enamel is particularly useful in providing a colored border around automotive glass, which enhances appearance and reduces degradation of adhesives by ultraviolet radiation.
Claims17
A ceramic enamel composition comprising 20-80% by weight of an oxide frit, an amount of a bismuth silicate seed material sufficient to cause nucleation and growth of crystals leading to increased refractoriness and devitrification in the composition upon firing, 10-40% by weight of a pigment, and 10-40% by weight of an organic vehicle.
A method of preparing a ceramic enamel composition comprising combining 20-80% by weight of an oxide frit, an amount of a bismuth silicate seed material sufficient to cause nucleation and growth of crystals leading to increased refractoriness and devitrification in the composition upon firing, 10-40% by weight of a pigment, and 10-40% by weight of an organic vehicle.
A glass substrate having a ceramic enamel coating adherent thereto, said coating being obtained by applying to at least a portion of a glass substrate a ceramic enamel composition comprising 20 to 80% by weight of an oxide frit, an amount of a crystalline bismuth silicate seed material sufficient to cause nucleation and growth of crystals leading to increased refractoriness and devitrification in the composition upon firing, 10 to 40% by weight of a pigment and 10 to 40% by weight of an organic vehicle and heating the coated glass substrate to an elevated temperature to fuse components of the ceramic enamel composition to the glass substrate.
Dependencies are inferred from the claim text.