Effect of Porosity after Heat Treatment on the Corrosion Resistance of MgO-C Bricks

摘要

MgO-C bricks have superior slag corrosion resistance and thermal spalling resistance and therefore are widely used as the working lining in various furnaces. When aiming to further improve the corrosion resistance of MgO-C bricks, the use of resin binder is a problem because it produces a lot of pores during carbonization. These pores provide openings for the infiltration of molten steel and molten slag into the structure of bricks. Furthermore the condition of the structure after the carbonization of resin binder can be an important factor that directly affects the corrosion resistance. As a solution, the methods of adding binders of high fixed carbon ratio1' and promoting the graphitization of phenolic resin by adding other kinds of additives2', have been examined. In this study, the samples of MgO-C bricks with different porosity due to the addition of a different quantity of phenolic resin and pitch were made, and also investigated the relationship between porosity and corrosion resistance.