NOVEL CALCIUM MAGNESIUM ALUMINATE BONDED CASTABLES FOR STEEL AND FOUNDRY LADLES

摘要

Extensive laboratory trials have demonstrated that ladle castables bonded with the novel calcium magnesium aluminate binder (CMA) have excellent corrosion and penetration resistance. The micro spinel inside CMA facilitates the design of new castable microstructures to improve penetration and corrosion resistance. However, inside steel and foundry ladles, several destructive phenomena occur simultaneously. Slag penetration, chemical dissolution, mechanical abrasion, and thermo-mechanical phenomena happen at the same time which is difficult to simulate in classical laboratory tests. Therefore this paper investigates how CMA based castables behave under real conditions inside steel and foundry ladles. Microstructure investigations of samples taken from ladle linings give an in-depth understanding of the mechanisms that lead to the improved performance of CMA based ladle castables.