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在CaCl2熔盐中,利用固体氧离子膜(SOM)法电解还原Ta2O5直接制备金属钽。研究了成形压力与烧结温度对阴极形貌及孔隙率的影响,进而获得阴极微结构对产物形貌及氧含量的影响规律。结果表明:阴极片的颗粒尺寸和孔隙率大小是影响电解还原的重要因素;Ta2O5片的孔隙率随着成形压力的增大、烧结温度的升高明显降低;孔隙率大,有利于电解还原的进行,产物颗粒尺寸大;孔隙率小,会导致阴极产物形成致密的金属外层;在成形压力为4MPa经1150℃烧结2h或6MPa经1100℃烧结2h条件下,阴极反应活性良好,电解产物氧含量低。
In CaCl2 molten salt, the solid tantalum oxide is directly prepared by the electrolytic reduction of Ta2O5 by solid oxide ion (SOM) method. The effect of forming pressure and sintering temperature on the morphology and porosity of the cathode was studied. The influence of cathode microstructure on the morphology and oxygen content of the cathode was also studied. The results show that the particle size and porosity of the cathode sheet are the important factors affecting the electrolytic reduction. The porosity of the Ta2O5 sheet decreases with the increase of the forming pressure, the sintering temperature decreases obviously, and the porosity is large, which is favorable for the electrolytic reduction , The product particle size is large; the porosity is low, will lead to the cathode product to form a dense metal outer layer; at a forming pressure of 4MPa sintered at 1150 ℃ 2h or 6MPa sintered at 1100 ℃ for 2h conditions, the cathode activity good, electrolytic oxygen Low content.