Metal and alloy powders and powder fabrication

C - Chemistry – Metallurgy – 22 – B

Patent

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Details

C22B 4/00 (2006.01) C22B 5/02 (2006.01) C22B 34/12 (2006.01) C25C 5/00 (2006.01)

Patent

CA 2429024

A precursor powder comprising a metal compound is formed into a sample for electro-deoxidation, for example by slip-casting. The sample is then immersed in a melt comprising a molten salt and a cathodic potential applied to remove non-metal species from the precursor powder by electro-deoxidation and dissolution in the melt. This typically forms a metallic sample which can be fragmented to form a metallic powder. In a second aspect of the invention a powdered feed material is formed into a shaped precursor and more extensive electro-deoxidation carried out so as to form a near-net shaped product.

Selon la présente invention, on transforme une poudre précurseur comprenant un composé métallique en un échantillon destiné à l'électroréduction, par exemple par coulage en barbotine. On immerge ensuite l'échantillon dans un bain comprenant un sel fondu et on applique un potentiel cathodique afin d'enlever l'espèce non métallique de la poudre précurseur par électroréduction et dissolution dans le bain. Ceci permet généralement de former un échantillon métallique que l'on peut fragmenter pour former une poudre métallique. Dans un second aspect, l'invention concerne une matière d'alimentation en poudre que l'on transforme en un précurseur formé et l'on procède à une électroréduction plus longue afin d'obtenir un produit formé d'une grande précision dimensionnelle.

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