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Journal of Metallurgy
Volume 2013 (2013), Article ID 629341, 6 pages
http://dx.doi.org/10.1155/2013/629341
Research Article

Preparation of Niobium Metal Powder by Two-Stage Magnesium Vapor Reduction of Niobium Pentoxide

1Refractory Metals Division, Centre for Materials for Electronics Technology (C-MET), IDA Phase-III, HCL (PO), Cherlapally, Hyderabad 500051, India
2Department of Physics, Osmania University, Hyderabad 500007, India

Received 19 November 2012; Revised 5 June 2013; Accepted 21 June 2013

Academic Editor: Herbert Ipser

Copyright © 2013 T. Satish Kumar et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Magnesium vapor reduction of niobium pentoxide was studied using a laboratory system. Niobium powder was prepared by the magnesium vapor reduction at 1123 K for 5 hours and it contained about 8 mass % oxygen. However, the oxygen concentration could be decreased to 0.65% when it was prepared by double-step reduction by magnesium vapor and a chemical treatment. Controlled and diluted supply of magnesium vapor to the reaction front has averted excess heat generation at the reaction front and thereby fine particles were produced. Effects of various factors on the vapor reduction process were studied and discussed.