Abstract
In order to increase the efficiency of advanced coal-fired power systems, higher working fluid temperatures must be reached. Some system surfaces will have to be protected by covering them with corrosion-resistant refractories. Corrosion is the degradation of the material surfaces or grain boundaries by chemical reactions with melts, liquids, or gases causing loss of material and consequently a decrease in strength of the structure. In order to develop methods of reducing corrosion, the microstructure that is attacked must be identified along with the mechanism and rates of attack. Once these are identified, methods for reducing corrosion rates can be developed. In order to determine the reactivity of a refractory to the slag or glass in most industrial applications, various slag tests have been developed. The most common are the cup slag test, drip slag test (ASTM C768), gradient slag test, rotary slag test (ASTM C874), and the dip-and-spin test. Among these tests, the cup slag test is the only static test method and most commonly used. In this study, we compared the rates of corrosion of castable alumina refractory samples modified with rare earth oxides (REOs) using the static test method, then compared the static test data with data from our dynamic corrosion test method.
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