Abstract
MgO grains in MgOC refractory usually blacken after being used at high temperature. In this paper, the cause and mechanism of blackening of the MgO grains were investigated. Fused MgO crystal grains, which are generally used in MgOC refractory, contain many micropores below 1 μm in size. When the MgO grain with micropores is heated in an atmosphere with high partial pressure of Mg, i.e. with low partial pressure of O 2, Mg diffuses from the grain surface to the micropores, and excess Mg condenses during cooling. Blackening of the MgO grain is caused mainly by condensation of Mg in the microdefects — in particular, in the micropores.
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