Patent ID: 6447570
Filing Date: 2002-09-10
Classification: H01G

Abstract:
A method of producing pellets for use in electrolytic capacitors, comprising,taking a powder selected from one of Tantalum and Niobium, mixing an oxygen active metal with the powder to create a powder mixture, embedding a lead wire into the powder mixture and, pressing the powder mixture into separate self-contained pellets, placing the pellets into an oxygen free chamber of a sealed container at room temperature, increasing the temperature in the chamber to a second temperature sufficiently higher than the room temperature to cause the oxygen active metal to react with oxygen in the pellets to remove oxygen from the pellets, then subjecting the pellets in the chamber to a third temperature higher than the second temperature to anneal the pellets; then cooling the pellets to the temperature lower than the annealing temperature; then injecting nitrogen into the chamber so that the nitrogen diffuses into the pellets to give the pellets a minimum DLC, then cooling the chamber to room temperature, and removing the pellets from the chamber.