Niobium oxide powder and tantalum oxide powder obtained by the method of manufacturing the same and method of manufacturing the niobium oxide powder and tantalum oxide powder

摘要

PROBLEM TO BE SOLVED: To provide tantalum oxide powder and niobium oxide powder which do not solidify when they are housed in a container and shaked but which shows a favorable compacting property on compression forming.;SOLUTION: The method for manufacturing the tantalum oxide powder or niobium oxide powder having a low solidifying property is carried out by adding an ammonia solution to a specified solution of a tantalum fluoride solution or a niobium fluoride solution, controlling the temperature and the pH of the solution to specified ranges after the addition of the ammonia solution, separating a produced hydroxide by filtration, washing the product with a diluted ammonia solution, pressing and filtering to obtain a hydroxide cake, roasting the obtained tantalum hydroxide cake at a specified temperature and then pulverizing. The tantalum oxide powder and the niobium oxide powder obtained by the above method have smooth rheological characters which are not conventionally obtained.;COPYRIGHT: (C)2004,JPO