Bright precious metals preparation for baking in at high temperatures and uses thereof for producing decorative bright precious metal elements

US6773498B1 · kind B1 · utility

Assignee

• Ferro Corporation · US

Inventors

• Hans-Michael Groh · Großkrotzenburg, DE
• Lutz Poth · Roßdorf, DE
• Peter Lang · Gelnhausen, DE

Key dates

• Filing date: May 8, 2002
• Grant date: Aug 10, 2004
• Expiry date: Sep 30, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2111/82
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Bright noble metal preparations for the production of bright noble metal decoration contain at least one noble metal compound and at least one non-noble metal as flux dissolved in a carrier medium. Preparations according to the invention, which are stoved at 1050 to 1300° C., contain as flux at least one cobalt compound in a quantity of 0.3 to 1.0 wt. %, calculated as CoO, and a chromium compound in a quantity of 0.2 to 0.7 wt. %, calculated as Cr2O3. The ratio by weight of Cr2O3 to CoO is in the range from 1.0-2.3.