Journal ArticleDOI
The fabrication of niobium powder by sodiothermic reduction process
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Niobium powder was fabricated by sodiothermic reduction process using K 2 NbF 7 as a raw materials, KCl and KF as the diluents and sodium as a reducing agent.Abstract:
Niobium powder was fabricated by sodiothermic reduction process using K 2 NbF 7 as a raw materials, KCl and KF as the diluents and sodium as a reducing agent. The apparatus for the experiment was designed and built specifically for the present study. Varying properties of niobium powder depending on reaction temperature and excess of reducing agent were analyzed. The niobium particle size increased significantly as reduction temperature increased from 993 to 1093 K. The particle size was fairly uniform at given reaction temperature, varying from 0.2 μm to 50 nm depending on the reaction temperature. The yield of niobium powder increased from 58% to 83% with a increase in reaction temperature. The average particle size of niobium powder was improved from 70 nm to 0.2 μm with increase in the amount of sodium excess. In addition, the yield of niobium powder was 82% in the 5% sodium excess.read more
Citations
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Preparation of Niobium Metal Powder by Two-Stage Magnesium Vapor Reduction of Niobium Pentoxide
TL;DR: Magnesium vapor reduction of niobium pentoxide was studied using a laboratory system as mentioned in this paper, where Niobium powder was prepared by the magnesium vapor reduction at 1123 K for 5 hours and it contained about 8 mass % oxygen.
Journal ArticleDOI
Electroless plating of Nb—Ni coatings from salt melt
TL;DR: In this article, a nickel surface is covered by Nb-Ni coatings to a thickness of 20 μm, which include NbNi3 and NbNbF7 intermetallic compounds.
Journal ArticleDOI
Magnesium Vapor Reduction of Niobium Oxide Compounds in the Range 540–680°C
Magnesium Vapor Reduction of Niobium Oxide Compounds in the Range 540–680°C
V. M. Orlov,E. N. Kiselev +1 more
Journal ArticleDOI
Effects of reduction temperature and diluent content on the properties of high-purity tantalum powder prepared using the Hunter process
Yong-Kwan Lee,Hyunchul Kim,Namhun Kwon,J.J. Sim,Mihye Lee,Soong Ju Oh,Seok-Jun Seo,Kyoung-Tae Park +7 more
TL;DR: In this paper , the process temperature at which a liquid pool of raw material and diluent can be formed and the corresponding amount of dilulent were analyzed by performing thermodynamic simulations using FactSage and HSC Chemistry software.
References
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Journal ArticleDOI
Tantalum and Niobium
G. L. Miller,W. J. Kroll +1 more
TL;DR: The identification of Ta and Nb minerals is critical to the evaluation of mine recovery and deposit economics as discussed by the authors, due to the extensive solid solution between Ta, Nb and Fe.
Journal ArticleDOI
STAFF-INDUSTRY COLLABORATIVE REPORT Tantalum and Niobium
TL;DR: In this article, a liquid-liquid extraction process for making tantalum and niobium fluorides is described, where the mixture is fed into a series of mixer-settler boxes and then separated from each other on the basis of solubility in methyl isobutyl ketone and aqueous solution.
Journal ArticleDOI
Making of tantalum powder using the hunter process
Sung Wook Cho,Gun Choo Shim,Je Shin Park,Joon Su Kim,In Sung Bae,Jae Sik Yoon,Seong Man Jeong +6 more
TL;DR: Tantalum powder was made from potassium heptafluorotantalate (K2TaF7) using sodium as a reductant based on the Hunter metallothermic reduction method as discussed by the authors.