Inert electrode material in nanocrystalline powder form

C - Chemistry – Metallurgy – 25 – C

Patent

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C25C 3/12 (2006.01) B22F 1/00 (2006.01) B22F 9/00 (2006.01) C04B 35/00 (2006.01) C04B 35/26 (2006.01) C04B 35/453 (2006.01) C22C 1/04 (2006.01)

Patent

CA 2441578

The invention relates to an inert electrode material in powder form comprising particles having an average particle size of 0.1 to 100 ~m and each formed of an agglomerate of grains of a ceramic material and grains of a metal or alloy with each grain of ceramic material comprising a nanocrystal of the ceramic material and each grain of metal or alloy comprising a nanocrystal of the metal or alloy. Alternatively, each particle can be formed of an agglomerate of grains with each grain comprising a nanocrystal of a single phase ceramic material, a metal or an alloy. The electrode material in powder form according to the invention is useful for the manufacture of inert electrodes having improved thermal shock and corrosion resistance properties.

La présente invention concerne un matériau d'électrode inerte, se présentant sous forme de poudre et comprenant des particules de taille moyenne allant de 0,1 à 100 µm, chacune constituée d'un agglomérat de grains d'une matière céramique et de grains d'un métal ou d'un alliage. Chaque grain de matière céramique comprend un nanocristal de la matière céramique et chaque grain de métal ou d'alliage comprend un nanocristal du métal ou de l'alliage. En variante, chaque particule peut être constituée d'un agglomérat de grains, chaque grain comprenant un nanocristal d'une matière céramique à une phase, d'un métal ou d'un alliage. Le matériau d'électrode sous forme de poudre selon cette invention est utilisé dans la production d'électrodes inertes présentant des propriétés de résistance au choc thermique et à la corrosion améliorées.

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