Tantalum (V) nitride pigments, process for the production thereof and use thereof

US6235103A · kind A · utility

Assignee

• Cerdec Aktiengesellschaft Keramische Farben · DE

Inventors

• Hans-Peter Letschert · Bonn, DE
• Wilfried Voigt · Rodenbach, DE

Key dates

• Filing date: Feb 22, 2000
• Grant date: May 22, 2001
• Expiry date: Feb 22, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/80
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Tantalum(V) oxide may be nitrided with ammonia at 700 to 1250.degree. C. to yield tantalum(V) nitride. According to the invention, nitriding and consequently pigment quality are improved by adding at least one pulverulent oxide from the series SiO.sub.2, GeO.sub.2, SnO.sub.2, TiO.sub.2, ZrO.sub.2 and HfO.sub.2 or a pulverulent precursor of such an oxide in a quantity of at least 0.1 wt. %, calculated as oxide, to the tantalum(V) oxide to be nitrided and then nitriding the powder mixture.