| 摘要 |
The present invention relates to a tantalum powder comprising: a first reduction step of reducing tantalum oxide with one type or two types of a reducing agent of yttrium (Y), lanthanum (La), cerium (Ce), praseodymium (Pr), and neodymium (Nd) to control an oxygen content inside the tantalum oxide to be 5.0 wt% or more and 15.0 wt% or less with respect to 100 wt% of the entire oxide; a first washing step of removing the reducing agent remaining on a surface of the tantalum oxide powder by pickling or water washing the tantalum oxide obtained from the first reduction step; a second reduction step of reducing the tantalum oxide obtained from the first reduction step with one type or two types of a reducing agent of magnesium (Mg) and magnesium (Mg)-M_1 alloy to obtain tantalum powder; and a second washing step of removing the reducing agent remaining on the surface of the tantalum powder by pickling or water washing the tantalum powder obtained from the second reduction step. In the first reduction step, the reducing agent is controlled to have a content of 0.30 times or more and 0.40 times or less, with respect to a stoichiometric amount of a reducing agent required to remove all of oxygen included in the tantalum oxide. In the second reduction step, the reducing agent is controlled to have a content of 0.5 times or more and 1.5 times or less, with respect to a stoichiometric amount of a reducing agent required to remove all of residual oxygen inside tantalum oxide obtained from the first reduction step. Thus, a method of manufacturing tantalum powder can be provided. |
