| The aim of this work was to determine experimentally the effects of four boron bearing additives (CaB{dollar}sb6{dollar}, Bc, ZrB{dollar}sb2{dollar} and colemanite) on high temperature properties--the oxidation resistance in air; the corrosion resistance to various steelmaking slags (EAF slag, secondary refining slag and BOF slag) and on the hot modulus of rupture, up to 1400{dollar}spcirc{dollar}C under reducing conditions, of resin bonded doloma and resin bonded magdoloma bricks, containing 10% of natural flak graphite. (1) Boron bearing additives have marked effects on improvement of oxidation resistance of doloma-carbon and magdoloma-carbon materials, (2) The remarkable effect of boron bearing additives on oxidation behavior is found to be attributed to the formation of borate melt protective layer, during oxidation, the borate being predominantly{dollar}rm Casb3Bsb2Osb6{dollar}. (3) Boron bearing additives are found, using a dynamic rotary test to be negative to slag corrosion of doloma-carbon and magdoloma-carbon materials. (4) Boron bearing additives have insignificant effect on hot strength tested under reducing atmosphere. (Abstract shortened by UMI.)... |
