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《Acta Metallurgica Sinica》 2006-03
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PREPARATION OF TANTALUM BY ELECTRO DEOXIDATION IN A CaCl_2-NaCl MELT

HU Xiaofeng, XU Qian School of Materials and Metallurgy, Northeastern University, Shenyang 110004  
Tantalum was prepared by electro-deoxidation from Ta2O5 in a CaCl2-NaCl melt at 800℃. Ta2O5 powders were compacted into pellets and sintered at 1000 ℃for 4 h, and then conducted as a cathode, while a high-density graphite rod as an anode. The micro-structural features of the Ta2O5 pellets before and after sintering were investigated experimentally, and the products of the electro-deoxidation were examined by XRD. The oxygen contents in the prepared products were determined by weighing the metal samples before and after re-oxidation in oxygen atmosphere. The results showed that high porosity in the sintered pellets can enhance the rate and extent of electro-deoxidation. It was found that the diffusion played an important role in the reduction process.
【Fund】: 国家自然科学基金资助项目50374030
【CateGory Index】: TF841.6
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