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陰極結(jié)構(gòu)對SOM法制備金屬鉭的影響
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貴州大學(xué)引進(jìn)人才科研項目（貴大人基合字（2009）015）；貴州省科學(xué)技術(shù)基金(黔科合J字[2010]2227)


Effect of Cathode Structure on Reduction of Ta2O5 Using SOM Process
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    摘要:

    在CaCl2熔鹽中，利用固體氧離子膜（SOM）法電解還原Ta2O5直接制備金屬鉭。研究了成形壓力與燒結(jié)溫度對陰極形貌及孔隙率的影響，進(jìn)而獲得陰極微結(jié)構(gòu)對產(chǎn)物形貌及氧含量的影響規(guī)律。結(jié)果表明：陰極片的顆粒尺寸和孔隙率大小是影響電解還原的重要因素；Ta2O5片的孔隙率隨著成形壓力的增大、燒結(jié)溫度的升高明顯降低；孔隙率大，有利于電解還原的進(jìn)行，產(chǎn)物顆粒尺寸大；孔隙率小，會導(dǎo)致陰極產(chǎn)物形成致密的金屬外層；在成形壓力為4 MPa經(jīng)1150 ℃燒結(jié)2 h或6 MPa經(jīng)1100 ℃燒結(jié)2 h條件下，陰極反應(yīng)活性良好，電解產(chǎn)物氧含量低。

    Abstract:

    Tantalum was prepared by solid oxygen-ion membrane (SOM) process from Ta2O5 directly in molten flux CaCl2 system. The micro-structural features and the porosities of the Ta2O5 pellets prepared at different pressures and sintered at different temperatures were investigated, and then the effect laws of the cathode microstructure on product morphology and oxygen contents were obtained. The results show that the particle size of cathode pellets and porosities are importance factors for the electrochemical reduction process. The porosities of the Ta2O5 pellets decrease remarkably as the pressure and sintering temperature increase. High porosity can enhance the rate of deoxidization and obtain bigger particle products; contrarily, a compact outer layer of metal tantalum is formed. When the Ta2O5 pellets are pressed at 4 MPa and sintered at 1150 oC for 2 h (or pressed at 6 MPa and sintered at 1100 oC for 2 h), electrolysis reaction activity is good and electrolytic products have low oxygen content.

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陳朝軼,魯雄剛,李軍旗,蒲 銳,楊 帆.陰極結(jié)構(gòu)對SOM法制備金屬鉭的影響[J].稀有金屬材料與工程,2012,41(3):522~526.[Chen Chaoyi, Lu Xionggang, Li Junqi, Pu Rui, Yang Fan. Effect of Cathode Structure on Reduction of Ta2O5 Using SOM Process[J]. Rare Metal Materials and Engineering,2012,41(3):522~526.]
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  • 收稿日期:2011-03-29
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