Refractory composition for making casting moulds and cores

摘要

Composition for making casting moulds and cores consists of finely divided yttrium oxide, an acid, an inert organic solvent and a supplementary refractory product chosen from yttrium oxide, zirconium oxide, molten yttrium oxide, molten zirconium oxide, molten stabilised zirconium oxide, and a molten homogeneous mixture of yttrium and zirconium oxides.