| 摘要 |
A method and process for producing a yttrium oxide metal casting refractory composition is disclosed. Powdered Y2O3 is combined with a sintering agent (preferably V2O5) and an organic binder. The mixture is sintered and ground to produce a stable Y2O3 flour. The flour is added to another binder having specific SiO2, hydrolysis and viscosity levels in order to produce a slurry. Slurries prepared in accordance with the invention avoid problems traditionally associated with Y2O3 hydration and/or carbonation, and have long storage lives. In addition, the material costs associated with the slurries are low in comparison with products using fused Y2O3. The Y2 O3 slurries may also find application as solid preformed cores formed by any conventional injection molding, transfer molding, or slurry casting process.
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