Process for the production of a coated system

US5618585A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Wolfgang Hechler · Herbstein, DE
• Johann Dietz · Dietzenbach, DE
• Manfred Weigand · Weiterstadt, DE
• Karl Osterried · Dieburg, DE

Key dates

• Filing date: Mar 15, 1996
• Grant date: Apr 8, 1997
• Expiry date: Mar 15, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2111/80
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a coated system which has a chemically and mechanically very stable surface coating of high aesthetic attraction which has a specular and optionally iridescent color and/or a body color on a metal, ceramic or quartz glass substrate provided with an enamel or glaze coating, the surface coating being obtainable PA1 by single or repeated application of aqueous metal oxide sols, PA1 by subsequently drying and optionally igniting the metal oxide sol coating at each application step, PA1 the metal oxide sols having a mean particle size of between 5 and 200 nm, PA1 ignition being carried out at least once after completion of the final application step and at temperatures higher than 700.degree. C. and below the softening point of the substrate, PA1 the metal oxide coating on the glaze or enamel coating having, after ignition, a refractive index at least 0.5 higher than the refractive index of the enamel or glaze coating, and PA1 the total thickness of the ignited metal oxide coatings being less than 500 nm.