Two-Step Synthesis of Ultrafine and Nanosized Powders of Tungsten Oxide and Carbide

Abstract:

In this work a new method of nanoand ultrafine powder of tungsten oxide and carbide synthesis by means of combinating carbon carrier supported classic liquid-phase precipitation and low-temperature microwave treatment was offered. The full range of intermediate substances obtained during thermolysis, reduction and carbidization precursors to final products were presented. The thermolysis of tungstic acid with the formation of tungsten oxide and carbide ultrafine particles of different modifications were studied. It was shown, that cooling ammonium tungstate solution to 4 °C, and use of carbon carrier on the precipitation stage can increase specific surface area from 20 to 100 m²g^-1. With the use of SEM precursors particles size were examined (∼200 nm) and the morphology of initial, intermediate and final products was shown.

• Periodical: Advances in Science and Technology (Volume 88)
• Pages: 9-14
• DOI: https://doi.org/10.4028/www.scientific.net/AST.88.9
• Online since: October 2014
• Authors: Irina V. Nikolaenko, Nikolay Kedin, Gennadii Shveikin
• Keywords: Microstructure, Microwave Synthesis, Precipitation, Tungsten Carbide, Tungsten Oxide

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