Tantalum or niobium metal powder prodn. - by reacting metal salt with reducing agent

摘要

A Ta or Nb metl powder with a high capacitance is produced by homogeneously mixing particles of a salt of this metal with a molten reducing agent, the reducing agent coating the particles of the salt, increasing the temp. to 100-500 degrees C. to initiate an exothermic reaction, continuing with stirring, maintaining the reaction products, except the metal obtd. in the reaction, at their m.pt. by heating for =15 mins., stirring for at least the initial part of this period so that large-size reaction products are almost continually broken up and a homogeneous mixt. of reactants and reaction products is obtd. and after cooling the metal powder is removed. The powders are used to produce sintered anodes for capacitors using solid or liq. electrolytes.