C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 21/06 (2006.01) C22B 7/00 (2006.01) C25C 3/24 (2006.01)
Patent
CA 2142874
Aluminium with a purety exceeding 99.998 %, produced by electrolytic refining, such as obtained at the outlet of the refining tank without subsequent processing, its rare earth content being less than 100 ppb and its total uranium and thorium content being less than 20 ppb. The invention also concerns a cost-reducing method for the manufacture of said aluminium. The high purity aluminium according to the invention is chiefly used in the metallization of electronic circuits.
2142874 9503434 PCTABS00170 L'invention a pour objet un aluminium de pureté supérieure à 99,998%, obtenu par raffinage électrolytique, tel qu'à la sortie de la cuve de raffinage et sans traitement ultérieur, sa teneur en terres rares est inférieure à 100 ppb et sa teneur totale en uranium et thorium est inférieure à 20 ppb. Elle a également pour objet un procédé de fabrication de cet aluminium permettant d'en abaisser le coût. L'aluminium de haute pureté selon l'invention est utilisé principalement pour la métallisation des circuits électroniques.
Aluminium Pechiney
Robic
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