THE MANUFACTURING OF NIOBIUM POWDER BY HUNTER PROCESS

Jae-Sik Yoon ()
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Jae-Sik Yoon: Korea Basic Science Institute Suncheon Center, 315 Maegokdong, Suncheon, Jeonnam 540-742, Korea

Surface Review and Letters (SRL), 2010, vol. 17, issue 02, 223-228

Abstract: Niobium powder was fabricated by metallothermic reduction process usingK2NbF7as the raw material,KClandKFas the diluents andNaas the 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 the reduction temperature increased from 993 to 1093 K. The particle size was fairly uniform at a given reaction temperature, varying from 0.2 μ m to 50 nm depending on the reaction temperature. The yield of niobium powder increased from 58 to 83% with an increase in reaction temperature. The average particle size of niobium powder was improved from 70 nm to 0.2 μ m with the increase in the amount ofNaexcess. In addition, the yield rate ofNbpowder was 82% in the 5% excess sodium.

Keywords: Niobium powder; metallothermic reduction; diluent; reaction temperature; reducing agent; particle size; yield (search for similar items in EconPapers)
Date: 2010
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DOI: 10.1142/S0218625X10013898

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