Ceramic material for use at elevated temperature

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 35/00 (2006.01) B05D 5/12 (2006.01) C04B 41/50 (2006.01) C25C 3/06 (2006.01)

Patent

CA 2543662

A ceramic material (20, 20A, 20B, 20C, 20C', 20D, 20E, 20E1, 20E2, 20E3, 20E4, 20F) comprises a structural mass made of at least one refractory compound selected from refractory borides, aluminides and oxycompounds, and combinations thereof. This structural mass has an open microporosity that is impregnated with colloidal and/or polymeric particles of iron oxide and/or a precursor of iron oxide. These particles promote wetting of the structural mass by molten aluminium and/or form upon heat treatment a sintered barrier against oxygen diffusion through the structural mass. The ceramic material can be used on cathodes (15), carbon or metal-based anodes (5, 5'), sidewalls (16) and other parts (26) of aluminium electrowinning cells, on electrodes (15A) of arc furnaces, and on stirrers (10) or vessels (45) of aluminium purification apparatus.

Matériau céramique (20, 20A, 20B, 20C, 20C', 20D, 20E, 20E¿1?, 20E¿2?, 20E¿3?, 20E¿4?, 20F) comprenant une masse structurelle faite d'au moins un composé réfractaire sélectionné parmi des borures, aluminures et composés oxy réfractaires, et leurs combinaisons. Cette masse structurelle présente une microporosité ouverte et est imprégnée de particules colloïdales et/ou polymères d'oxyde de fer et/ou d'un précurseur d'oxyde de fer. Ces particules favorisent le mouillage de la masse structurelle par de l'aluminium fondu et/ou forment une barrière frittée après traitement thermique contre la diffusion d'oxygène à travers la masse structurelle. Le matériau céramique peut être utilisé sur des cathodes (15), des anodes carbonées ou métallisées (5, 5'), des parois (16) et autres composants (26) de cellules d'extraction électrolytique d'aluminium, sur des électrodes (15A) de fours à arc, des agitateurs (10) ou des récipients (45) d'appareils de purification d'aluminium.

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