Effect of doping additives on the electrical properties of alumina ceramic and the mechanism of its interaction with a steel melt

Abstract

Impurities intensify the structural changes in the articles being tested and change theirproper~ies. A concentration of SiO 2 and Fe203 in amounts of 0.5-1.0% increases the extent of the chemical reaction betnveen the refractory and the alkalis and lowers the electrical resistivity by an order of magnitude.The erosion of the periclase articles made from sintered and electrosmelf~d material is approximately the same at high temperatures and in a medium with a higher concentration of oxygen (23%)o The conditions under which the bushing is used in plasma-chemical apparatus with an are-column temperature of 4500--6000~ are somewhat complex and therefore it is necessary to develop an optimum design of the plasmatron unit and better methods of protecting the articles in use. LITERATURECITED