Formation of a refractory repair mass

C - Chemistry – Metallurgy – 04 – B

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C04B 35/65 (2006.01) C03B 5/43 (2006.01) C04B 35/66 (2006.01) C04B 41/87 (2006.01)

Patent

CA 2244743

A process and powder mixture are provided for the ceramic welding repair of electrocast refractory oxide materials, such as those used in parts of glassmaking and metallurgical furnaces exposed to severe high temperature conditions. The powder mixture, which is to be projected in an oxygen gas stream against a refractory surface to be repaired, comprises combustible particles such as aluminium and silicon and refractory oxide particles plus at least one constituent, for example sodium carbonate and/or excess silica, which produces a vitreous phase in the repair mass, thereby enhancing the bond between the repaired refractory material and the repair mass.

La présente invention concerne un procédé et un mélange pulvérulent pour la réparation, par soudage céramique, d'oxydes réfractaires électrofondus tels que ceux qu'on utilise dans les parties de fours de fabrication du verre et de fours métallurgiques exposées à des conditions sévères de hautes températures. Le mélange pulvérulent, qui doit être projeté, dans un courant d'oxygène, contre une surface réfractaire à réparer, comporte des particules combustibles, par exemple d'aluminium et de silicium, et des particules d'oxydes réfractaires, ainsi qu'au moins un constituant, par exemple du carbonate de sodium et/ou de la silice en excès, ce qui donne une phase vitreuse dans la masse de réparation. Cela renforce la liaison entre la matière réfractaire réparée et la masse de réparation.

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