Making niobium and other metal powders by milling

B - Operations – Transporting – 22 – F

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B22F 1/00 (2006.01) B22F 9/04 (2006.01) C22C 1/04 (2006.01)

Patent

CA 2367907

Methods of forming niobium powders and other metal powders are described. The method involves milling the metal powders at elevated temperatures and in the presence of at least one liquid solvent. The methods of the present invention have the ability to reduce DC leakage and/or increase capacitance capabilities of metal powders when formed into capacitor anodes. The present invention further has the ability to significantly reduce the milling time necessary to form high surface area metal powders and leads to reducing the amount of contaminants in the metal powders. Metal powders such as niobium powders having reduced amount of contaminants and/or having DC leakage or capacitance capabilities are also described. A process is further described for forming a flaked metal by wet-milling a metal powder into a flaked metal wherein at least one liquid fluorinated fluid is present during the wet-milling process. The process is particularly well suited for forming metal flakes, such as niobium or tantalum flakes, of high purity.

L'invention concerne des procédés de formation de poudres de niobium et d'autres métaux. Le procédé consiste à broyer des poudres métalliques à des températures élevées et en présence d'au moins un solvant liquide. Les procédés permettent de réduire les pertes en courant continu et/ou d'accroître les capacités des poudres métalliques formées dans les anodes imprégnées de condensateur. En outre, on peut réduire sensiblement la durée de broyage nécessaire pour produire des poudres métalliques à surface efficace élevée ainsi que la quantité de contaminants présents dans lesdites poudres. L'invention traite également des poudres de niobium, par exemple, dont la quantité de contaminants est réduite et/ou qui présentent des pertes en courant continu ou qui sont dotées de capacités. En outre, un procédé permet de former des paillettes métalliques par broyage humide d'une poudre métallique en paillettes, en présence, durant le processus, d'un fluide fluoré. Le processus convient particulièrement pour produire des paillettes métalliques de grande pureté, telles que de niobium ou de tantale.

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