Study on the Preparation of Capacitor-Grade Tantalum Powder by Magnesium Thermal Reduction of Tantalum Oxide 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 was prepared by magnesium thermal reduction method using high-purity tantalum oxide as raw material,metallic magnesium as reducing agent,and KCl as diluent.Subsequently,tantalum powder for capacitors was obtained by high-temperature heat treatment and deoxidation.The morphological evolution of the raw material(tantalum oxide)in the reduction process was investigated.Meanwhile,the effects of primary sintering temperature,magnesium dosage,and KCl dosage on the microscopic morphology and physical properties of the reduced tantalum powder were systematically analyzed.The electrical properties of the lab-prepared capacitor-grade tantalum powder were compared with those of commercially available products of the same grade.The results show that during the magnesium thermal reduction of tantalum oxide to produce tantalum powder,the reduced products(Ta and MgO particles)are completely peeled off,facilitating their separation.With an increase in primary sintering temperature or reducing agent(Mg)dosage,the oxygen content in the reduced tantalum powder decreases,while the FSSS particle size increases,and the specific surface area decreases.The addition of diluent KCl can improve particle size uniformity of the reduced tantalum powder,reduce its oxygen content,and also regulate the powder's particle size.The capacitor-grade tantalum powder derived from reduced tantalum powder exhibits excellent comprehensive electrical properties—particularly a breakdown voltage as high as 301 V,which is superior to that of commercially available products of the same grade,and it fully meets the application requirements for high-voltage and high-reliability capacitor-grade tantalum powder in high-end fields.