CAPACITOR GRADE HIGH SPECIFIC VOLUME TANTALUM POWDER IMPROVING ELECTRICAL PERFORMANCE AND PREPARATION METHOD THEREFOR

摘要

A method for providing a tantalum powder with a piece + block structure, comprising the following steps: 1) providing a granulous tantalum powder, and dividing same into a first part and a second part; 2) putting the first part of the tantalum powder in a ball mill for ball milling, taking the powder out after the ball milling and sieving same, and obtaining a tantalum powder in the form of a piece; 3) mixing the tantalum powder in the form of a piece and the second part of the tantalum powder to obtain a mixture, and preferably, the mixing proportion of the tantalum powder in the form of a piece and the granulous tantalum powder being 1:0.1~1, preferably being 1:0.25~0.8, and more preferably being 1:0.4~0.6; and 4) performing the steps of water washing, acid washing, and nodularization on the mixture to finally obtain a tantalum powder with a piece + block structure.