METHOD FOR PREPARING CAPACITOR-GRADE TANTALUM POWDER WITH HIGH NITROGEN CONTENT, CAPACITOR-GRADE TANTALUM POWDER PREPARED THEREBY, AND ANODE AND CAPACITOR PREPARED FROM TANTALUM POWDER.

摘要

A method for preparing a capacitor-grade tantalum powder: when potassium fluotantalate is reduced by sodium, solid tantalum nitride is added, and therefore while the nitrogen content in the tantalum powder is increased, the electrical performance of the tantalum powder is improved, both increasing the specific volume and improving the leakage current and loss. The qualification rate of the anode and capacitor products is improved. The method is characterized in that the nitrogen in the tantalum nitride diffuses between the particles of the tantalum powder, substantially with no loss, and thus the control of the nitrogen content is accurate and controllable.