Reaction of silicon carbide with fused coal ash. Final report. [4 refs]

TL;DRAbstract

The reaction of two grades of commercial silicon carbide (Carborundum KT and Super KT) with fused coal ash slags (acid and basic) in a synthetic coal combustion atmosphere have been studied. Computer calculations of chemical equilibria predicted a thermodynamic instability of the carbide in this environment. However, experimentally observed reaction rates were found to be exceedingly slow in either acid or basic ash slags. Both grades of silicon carbide were found to have equally good long term resistance of the SiC phase to corrosive attack by either sintered or fused ash at temperatures to 1250/sup 0/C (basic ash) and 1450/sup 0/C (acid ash). Super KT silicon carbode suffered extensive loss of free silicon from the entire outside surface of tubes exposed to both acid and basic ash slags in short times (less than 50 hr.). The effect was most pronounced in acid slags at temperatures above 1250/sup 0/C. The KT grade of SiC was much more resistant to this form of attack and suffered only

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