FIRED REFRACTORY BRICK AND PROCESS FOR PREPARING THE SAME

摘要

A fired refractory brick composed of magnesia, 2 to 10% alumina, calcium oxide and up to 1.5% silica, the weight ratio of calcium oxide to silica being more than 1.4, and at least 2.2 (CaO - 1.4 SiO2) % zirconia, calcium and zirconium forming a calcium zirconate phase in the brick and the content of the calcium zirconate phase being from 0.5 to 8%, all percentages being by weight. This brick is prepared from a mixture of the components by pressing the mixture into the shape of a brick and firing the brick at a temperature of 1600.degree.C to 1800.degree.C until the brick contains the indicated amount of the calcium zirconate phase.