IMPROVED VACUUM INDUCTION MELTING (VIM) BRICK LININGS

摘要

Vacuum Induction Metallurgical (VIM) samples based upon a magnesia alumina composition was studied along with the reasons for lining failure. Failure was often accompanied by metal penetration at the joints and hot face densiflcation. Reaction phases involved calcium aluminate penetration, recrystallization of the original insitu spinel bonding phase and migration of silica into the interior of the brick where it combined with lime to form dicalcium silicate. These reactions were comparable with those proposed in the CaO-MgO-Al_2O_3-SiO_2 system at equilibrium. An improved thermal stability brick composition was developed with the potential to reduce metal penetration over that of the standard product that had been used for the past 30 years.