Effect of Silica Coating on the Thermal Stability of Tantalum Based Nitrides Pigments

Abstract:

The colored TaON and Ta3N5 were synthesized by ammonolysis of amorphous Ta(OH)5 in the temperature range of 800-1000°C. Ta(OH)5 were prepared by titration process from TaCl5. TaON were synthesized at 900°C for 2 hr, and Ta3N5 were synthesized at 1000°C for 5 hr. In general, Ta3N5 powders were easily oxidized at 500°C with changing colority from red to white. To minimize the oxidation problem of Ta3N5 powders, we proposed silica coated system using TEOS and APTES as a surfactant. Tonality of silica coated Ta3N5 has very little changing which means silica coating actually minimizes the oxidation of the Ta3N5 particles.

• Periodical: Key Engineering Materials (Volumes 434-435)
• Pages: 134-137
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.434-435.134
• Online since: March 2010
• Authors: Jong Chul Park, Jae Hwan Pee, Yoo Jin Kim, Woo Seok Cho
• Keywords: Nitridation, Pigment, Silica Coating, Ta₃N₅

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