DEVELOPMENT AND APPLICATION OF MgO-C BRICK RESTRAINED DETERIORATION OF MICROSTRUCTURE AT HIGH TEMPERATURE

摘要

We examined the evaluation method for predictio'n of deterioration of MgO-C microstructure, and we developed the MgO-C brick that is restrained its deterioration. We summarized as follows: (1) We examined the firing temperature to evaluate MgO-C brick in the laboratory. Therefore the firing at 1550℃ is very effective to predict the life of MgO-C brick. (2) Addition of borate is very effective to restrain the deterioration of microstructure of MgO-C brick that is used for converter. (3) The trial MgO-C brick that contains borate was applied to converter. Therefore we concluded that the restraining of deterioration of microstructure is superior to decreasing the spalling-resistant because by glass phase of borate.