Molten salt leach for removal of inorganic cores from directionally solidified eutectic alloy structures

摘要

Cores made of either Y.sub.2 O.sub.3, Y.sub.3 Al.sub.5 O.sub. 12, LaAlO. sub.3, MgAl.sub.2 O.sub.4 or Al.sub.2 O.sub.3 are removed from castings of advanced superalloy materials by immersion in a molten salt bath of either Li.sub.3 AlF.sub.6 or a mixture of CaF.sub.2 -- NaF.