Method for preparing tantalum powder of capacitor grade with high nitrogen content, tantalum powder of capacitor grade prepared thereby, and anode and capacitor prepared from tantalum powder
US9764388B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 10, 2013 |
| Grant date | Sep 19, 2017 |
| Priority date | — |
| Expiry date | Dec 10, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01G9/0525
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for preparing a tantalum power of capacitor grade, comprising: solid tantalum nitride is added when potassium fluotantalate is reduced by sodium. The method increases the nitrogen content in the tantalum powder, and at the same time improves the electrical performance of the tantalum powder. The specific capacitance is increased, and the leakage current and loss is improved. The qualification rate of the anode and the capacitor product is also improved. The method is characterized in that the nitrogen in the tantalum nitride diffuses between the particles of the tantalum powder, with substantially no loss, and thus the nitrogen content is accurate and controllable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.