Prevention of oxidation of carbonaceous and other materials...

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 41/87 (2006.01) C04B 41/50 (2006.01) C04B 41/52 (2006.01) C04B 41/89 (2006.01) C25C 3/08 (2006.01) C25C 3/12 (2006.01)

Patent

CA 2131288

A body of carbonaceous or other material for use in corrosive environments such as oxidizing media or gaseous or liquid corrosive agents at elevated temperatures, in particular in molten salts such as cryolite, is coated with a protective surface coating which improves the resistance of the body to oxidation or corrosion and which may also enhance the bodies electrical conductivity and/or its electrochemical activity. The protective coating is applied in one or more layers from a colloidal slurry containing reactant or non-reactant substances, or a mixture of reactant and non-reactant substances, in particular mixtures containing silicon carbide and molybdenum silicide or silicon carbide and silicon nitride, which when the body is heated to a sufficient elevated temperature reaction sinter as a result of micropyretic reaction and/or sinter without reaction to form the protective coating.

Un corps de matière carbonée ou autre pour utilisation dans des milieux environnants corrosifs comme les milieux oxydants ou contenant des agents corrosifs gazeux ou liquides à des températures élevées, en particulier les sels en fusion comme la cryolithe, est recouvert d'un revêtement de surface protecteur qui améliore la résistance du corps à l'oxydation ou à la corrosion et qui peut également accroître la conductivité électrique du corps en question et/ou son activité électrochimique. Le revêtement protecteur est appliqué en une ou plusieurs couches à partir d'une suspension colloïdale contenant les substances réactantes ou non réactantes, ou un mélange de substances réactantes ou non réactantes, en particulier des mélanges contenant du carbure de silicium et du siliciure de molybdène ou du carbure de silicium et du nitrure de silicium. Lorsque le corps est chauffé à une température suffisamment élevée, il y a avec réaction, par suite d'une réaction micropyrétique, et/ou frittage sans réaction pour former le revêtement protecteur.

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