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AssigneeMoltech Invent S.A.
InventorsThinh T. Nguyen, Vittorio De Nora
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A method of manufacturing a component, in particular an aluminium electrowinning anode, for use at elevated temperature in an oxidising and/or corrosive environment comprises: applying onto a metal-based substrate layers of a particle mixture containing iron oxide particles and particles of a reactant-oxide selected from titanium, yttrium, ytterbium and tantalum oxides; and heat treating the applied layers to consolidate by reactive sintering of the iron oxide particles and the reactant-oxide particles to turn the applied layer into a protective coating made of a substantially continuous reacted oxide matrix of one or more multiple oxides of iron and the metal from the reactant-oxide. The metal-based substrate comprises at its surface during the heat treatment an integral anchorage-oxide of at least one metal of the substrate. The anchorage-oxide anchors the multiple oxide matrix to the substrate by reacting with the iron oxide and/or the reactant-oxide to form an integral multiple bonding oxide of the metal of the integral anchorage-oxide and iron from the iron oxide and/or the metal of the reactant-oxide. The particle mixture can be applied in a colloidal and/or polymeric slurry.
A method of manufacturing a component for use at elevated temperature in an oxidising and/or corrosive environment, in particular in a cell for the electrowinning of aluminium, comprising:
The method of 13, wherein the particle mixture further comprises one or more metals selected from Fe, Cu, Co, Cr, Al, Ga, Ge, Hf, In, Mo, Mn, Os, Re, Se, Ti, Ta, V, W, Zr, Li, Ca, Ce, Nb, Ru, Si, Sn, Zn, Mischmetals and metals of the Lanthanide series, and alloys thereof, the reactive-sintering heat treatment being carried out in an oxidising atmosphere to oxidise into metal oxide(s) said one or more metals with a resulting volume expansion that compensates at least partly a volume contraction caused by the reactive formation of the multiple oxide from the particles of iron oxide and the reactant-oxide(s).
A component for use at elevated temperature in an oxidising and/or corrosive environment, in particular in a cell for the electrowinning of aluminium, comprising a metal-based substrate coated with a substantially continuous oxide matrix of one or more multiple oxides of iron and at least one metal selected from titanium, yttrium, ytterbium and tantalum, anchored to the substrate by a bonding oxide layer of a multiple oxide of at least one metal of the substrate and at least one metal of the oxide matrix, the multiple oxide matrix being producible by reacting single oxides of metals of the multiple oxide(s) of the matrix and bonded to the substrate by the bonding oxide layer that is producible by reacting at least one of said single oxides with an anchorage-oxide which is integral with the metal-based substrate and formed by surface oxidation thereof.
Dependencies are inferred from the claim text.