Corrosion Resistance and Microstructure of High‐Alumina Refractories, Based on the Rotary Slag Test

Abstract

The corrosion resistance and microstructure of four highalumina and two chromia‐containing high‐alumina refractories were evaluated. Analysis of the refractories after exposure in the rotary slag test showed that the chromia‐containing products had better slag resistance than the chromia‐free products. Three factors contributed to this conclusion, including formation of a Cr‐spinel layer at the slag/refractory interface, formation of an impermeable mullite layer just below the interface, and improved matrix bonding from chromia‐alumina solid‐solution formation.