REDUCTION IN ALUMINUM-ALLOY ATTACK ON ALUMINOSILICATE REFRACTORIES BY ADDITION OF RARE-EARTH-OXIDES

Several aluminosilicate compositions were tested for molten 7075 aluminum alloy attack with and without the addition of 10% Na2CO3. The extent of corrosion was proportional to the silica content of the refractory and especially of the matrix phase. The addition of rare earths up to 15% by weight to the aluminosilicates virtually eiiminated corrosion. Bastnasite, a rare‐earth concentrate, was found to be a more effective additive at low concentrations than either CeO2 or La2O3 alone in rendering the aluminosilicates corrosion resistant. Copyright © 1990, Wiley Blackwell. All rights reserved