Technical Study on Preparation of Tantalum Powder for Capacitors by Magnesium Thermal Reduction of Ta₂O₅ AITranslate

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Chinese Library Classification Number:TG146.416[金属学及工艺—金属材料]

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Tantalum powder for capacitors was prepared by the magnesium thermal reductionof Ta₂O₅.The effects of magnesium addition,holding temperature,and holding time on the composition and electrical properties of the tantalum powder were investigated.The results show that insufficient magnesium addition,low holding temperature,and short holding time result in incomplete reduction of Ta₂O₅.However,excessive magnesium addition leads to an increase in the leakage current of tantalum powder and the waste of magnesium chips and acid.And high holding temperature and long holding time lead to a decrease in the electric capacity of tantalum powder and an increase in energy consumption,thereby raising the cost.To reduce costs and improve efficiency,the optimal process conditions include the magnesium addition of twice the theoretical amount,holding temperature of around 960 ℃,and holding time of 6 hours.Under such conditions,the prepared tantalum powder exhibits an oxygen content of 0.362 0%,magnesium content of 0.001 1%,leakage current coefficient(K value) of 4.4×10^-4 μA/(μF·V),and weight-specific capacity of 15 630 μF·V/g.