Soldadura cerámica: método de reparación de revestimientos refractarios

HUGO E. LOBATO; MARÍA ANDREA CAMERUCCI

BOLETíN DE LA SOCIEDAD ESPAñOLA DE CERáMICA Y VIDRIO

Sociedad Española de Cerámica y Vidrio

Lugar: Madrid; Año: 2008 vol. 47 p. 95 - 100

0366-3175

The ceramic welding process is a unique hot repair technique for refractory linings in industrial equipments. This process consists of projecting a weld mix in powder by means of a current of oxygen or oxygen/air onto the refractory surface to be restored. The weld mix content refractory particles chemically compatible with the refractory to be repaired and a solid combustible (oxidizable fine particles, metallic and/or non metallic) as exotermic agent. When the combustible particles ignites at contact with the hot face (1000-1500°C), an exotermic reaction with oxygen occurs developing temperatures of the order of 2000-2500°C. The heat generated from this reaction is enough to melt the surface to be repaired and allowing a very close bond to be formed between the repaired area and the deposited material. There are limited data in literature about ceramic welding and the larger part of the information is protected by patents. Several differences between the available patents were detected. In this work, the principal aspects of researches about ceramic welding that had been relieved are present, including results and conclusions from a study accomplished about ceramic welding (design and set up of a test in laboratory, and evaluation of the reparations) for the reparation of silica bricks employed to build coke ovens.