中文摘要：

在800℃的CaCl2-NaCl混合熔盐体系内，以烧结后的Ta2O5片体做阴极、高密度石墨碳棒做阳极，在工作电压为3．1V的条件下进行电解脱氧反应．研究了1000℃烧结4h前、后Ta2O5片体的孔隙率和微观形貌，以及阴极片结构对电解还原反应过程的影响；利用XRD分析了电解产物的相组成，采用称重法测量了电解产物的氧含量．结果表明，采用熔盐电脱氧法可以制备出金属Ta，其阴极片的大孔隙率有利于电解脱氧反应的进行；扩散过程是影响熔盐电脱氧反应速度的重要环节．

英文摘要：

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 electrodeoxidation. It was found that the diffusion played an important role in the reduction process.