A process for forming a refractory repair mass

Details A process for forming a refractory repair mass A process for forming a refractory repair mass

C - Chemistry, Metallurgy

04

B

C04B 35/66 (2006.01) C04B 35/65 (2006.01)

Patent

CA 2223445

Formation of a refractory repair mass, in particular on an alumina_containing surface which is to be exposed to heavy duties, employs a powder mixture comprising alumina and, by weight, at least 5 % of a metallic combustilbe which is at least 30 % aluminium, and 3 to % of an absorbency-reducing agent. A ceramic welding technique is used in which the powder mixture is projected in gaseous oxygen against the surface to be repaired such that reaction between the combustible particles and oxygen occurs against the surface, thereby releasing the heat of reaction against the surface to form the repair mass.

L'invention concerne la formation d'une masse de réparation de matériaux réfractaires, en particulier sur une surface qui contient de l'alumine destinée à être exposée à des sollicitations importantes. Le procédé consiste à utiliser un mélange pulvérulent comprenant de l'alumine et, en poids, au moins 5 % d'un combustible métallique qui est constitué par au moins 30 % d'aluminium et 3 à 10 % d'un agent réduisant l'absorbance. On utilise une technique de soudage de la céramique, dans laquelle le mélange pulvérulent est projeté dans de l'oxygène gazeux contre la surface à réparer, de manière à ce que la réaction entre les particules de combustible et l'oxygène se produise sur la surface et libère la chaleur de réaction à ce niveau, pour former la masse de réparation.

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