Nitrided valve metals and processes for making the same

B - Operations – Transporting – 22 – F

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B22F 1/00 (2006.01) C23C 8/24 (2006.01) C23C 8/34 (2006.01) C23C 8/80 (2006.01) H01G 4/008 (2006.01) H01G 9/052 (2006.01)

Patent

CA 2401779

Nitrided valve metals are described, such as nitrided tantalum and nitrided niobium. The nitrided valve metals preferably have improved flow properties, higher Scott Densities, and/or improved pore size distribution which leads to improved physical properties of the valve metal and improved electrical properties once the valve metal is formed into a capacitor anode. Processes for preparing a nitrided valve metal are further described and involve nitriding the valve metal at a sufficient temperature and pressure during a heat treatment that is prior to the deoxidation step. Capacitor anodes and other products incorporatinng the valve metals of the present invention are further described.

La présente invention concerne des métaux de valve nitrurés tels que le tantale nitruré et le niobium nitruré. Les métaux de valve nitrurés de l'invention possèdent des propriétés rhéologiques améliorées, des densités de Scott plus élevées et/ou une distribution améliorée de la taille des pores, toutes qualités qui confèrent des propriétés physiques améliorées au métal de valve et des propriétés électriques améliorées une fois que ce dernier forme une anode de condensateur. La présente invention se rapporte à un procédé permettant de préparer un métal de valve nitruré, selon lequel on nitrure un métal de valve à une température et sous une pression suffisantes au cours d'un traitement thermique préalable à une étape de désoxydation. L'invention se rapporte également à des anodes de condensateur et à d'autres produits dans lesquels sont intégrés les métaux de valve de l'invention.

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