Process for producing decorated glass-ceramic articles with treatment with an acid prior to decorating and devitrifying

US5269826A · kind A · utility

Assignee

• Schott Glaswerke · DE

Inventors

• Roland Leroux · Stadecken-Elsheim, DE
• Jurgen Thurk · Schornsheim, DE
• Vera Muller · Oppenheim, DE

Key dates

• Filing date: May 11, 1992
• Grant date: Dec 14, 1993
• Expiry date: May 11, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C23/008
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for producing decorated glass-ceramic articles is described in which an article of crystallizable glass, prior to being decorated with a ceramic color and then converted into a glass-ceramic article by heat treatment with simultaneous burning-in of the ceramic color, is pre-heat treated with a Bronsted acid at temperatures between 50.degree. and 800.degree. C. until the surface layer of the glass article is modified so that the layer of ceramic color sinks into the surface of the article during burning-in/ceramicizing, thereby permitting if desired, a thicker layer of ceramic color to be applied and the production of decorated glass-ceramic articles in which the decoration is flush with the surface of the article to be produced, thereby reducing its susceptibility to damage and wear.