Influences of Distribution of Al Additive on Properties of MgO-C Refractories

摘要

Various kinds of metals are added to carbon-containing refractories as antioxidants. The degree of the effect of the metals is quite different by their kind, quantity and distribution in the refractories. In this study the most effective and ideal method the distribution of metal Al in refractories was examined. As a result, when metal Al was distributed homogeneously among graphite grains, the pore size in the refractories became smaller and there was less decrease in strength after heating. Moreover, densification of the refractories was promoted because of the formation of spinel crystals among the graphite grains. On the other hand, when Al grains were in contact with the surface of MgO grains, the pore size became larger and there was greater decrease in the strength.From the above-mentioned results, it is desirable to distribute Al grains during process of mixing raw materials of the refractories.