Tantalum and Niobium Nanopowders for Porous Material Creation

摘要

Capacity increasing of tantalum and niobium capacitors is an important problem. This could be achieved by using fine tantalum powders and forming from them anode with more developed surface.Authors worked out tantalum and niobium nanopowders production process with average grain size regulated from 20 to 150 nm which consisted in reduction tantalum pentachloride in the hydrogen stream heated in plasmogenerator till several thousands temperature. Obtained powders have high purity in oxygen and metallic admixture and also low powder mass - 0,1 - 0,3 g/cm~3. To stabilize the structure and also to regulate granulometric structure the powders endured heat treatment. Treatment temperature defined further materials properties. Powder sintering was hold by 900-1100°C. Porosity of obtained materials was 0,55 - 0,75 from theoretical. Pores size was regulated in the range of 0,5 - 0,05 μm.Experimental samples of tantalum anodes with high specific surface area were obtained.