초록 ▼

The oxygen content of tantalum is reduced by intimately contacting the tantalum with an alkali metal halide, reacting them in a non-oxidizing atmosphere at a maximum temperature of 1200°C. to form and expel the tantalum halide and alkali metal oxide formed by the reaction, and then raising the tempe

The oxygen content of tantalum is reduced by intimately contacting the tantalum with an alkali metal halide, reacting them in a non-oxidizing atmosphere at a maximum temperature of 1200°C. to form and expel the tantalum halide and alkali metal oxide formed by the reaction, and then raising the temperature to 1400°C. for no longer than 10 min. to volatilize any excess alkali metal halide. The tantalum may be in the form of a powder or a porous sintered pellet, and an improved product for electrolytic capacitors, with lower leakage current, is obtained.

대표청구항 ▼

A process for reducing the oxygen content of tantalum to obtain a high CV product for electrolytic capacitors comprising intimately contacting said tantalum with an alkali metal halide, reacting said metal halide with said tantalum oxide out of contact with an oxygenated medium at a temperature of a

A process for reducing the oxygen content of tantalum to obtain a high CV product for electrolytic capacitors comprising intimately contacting said tantalum with an alkali metal halide, reacting said metal halide with said tantalum oxide out of contact with an oxygenated medium at a temperature of at most 1200°C. to form a corresponding alkali metal oxide, and then increasing said temperature to at most 1400°C. for at most 10 minutes to volatilize and expel any excess alkali metal halide.