Patent ID: 9199307
Filing Date: 2015-12-01
Classification: B22F,H01G

Abstract:
1. A process for preparing tantalum powder wherein the tantalum powder has a BET surface area of not more than 0.530 m 2 /g, and Fisher mean particle size of not less than 3.00 μm, wherein the tantalum powder is prepared by the process comprising: mixing a tantalum compound with a dilution agent and tantalum powder as seed, wherein the tantalum powder as seed is tantalum powder that has been milled to the form of a flake powder having an aspect ratio of 5 to 20, and wherein the particle size of the tantalum powder as seed is −60 mesh; reducing the tantalum compound by adding a reducing agent to a molten mixture of the tantalum compound, dilution agent and tantalum powder as seed, wherein the reduction is carried out at a temperature of 800-1000° C.; soaking at a temperature of 700-1000° C.; and removing the tantalum powder; wherein the produced tantalum powder has a particle distribution in which particles of −325 mesh represent less than 60 vol % of all particles in the produced tantalum powder.