Reducing the oxygen content of tantalum

Details Reducing the oxygen content of tantalum Reducing the oxygen content of tantalum

C - Chemistry, Metallurgy

22

B

53/143

C22B 34/20 (2006.01) B22F 1/00 (2006.01) C22B 34/24 (2006.01)

Patent

CA 1228988

REDUCING THE OXYGEN CONTENT OF TANTALUM Abstract of the Disclosure The oxygen content of tantalum powder or a sintered tantalum pellet is reduced by intimately contact- ing the tantalum with an alkali metal halide, reacting the tantalum with the halide in a non-oxidizing atmosphere at up to 1200°C to form and expel the tantalum halide and alkali metal oxide formed by the reaction, and then rais- ing the temperature to up to 1400°C for no longer than 10 min to volatilize any excess alkali metal halide. An improved product for electrolytic capacitors, with lower leakage current, is obtained.

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