| 摘要 |
<p>A ceramic core for use in the investment casting of metals includes, prior to sintering, about 80 w/o to about 86 w/o of a ceramic filler material and about 14 w/o to about 20 w/o of a binder material. The ceramic filler material includes about 66 w/o to about 95 w/o Al2O3 particles, about 1 w/o to about 20 w/o Y2O3 particles, about 1 w/o to about 5 w/o of a grain growth inhibiting agent, and the balance a carbon-bearing fugitive filler material. Subsequent to sintering, the ceramic core has a microstructure characterized by the presence of substantially unreacted Al2O3 particles having a polycrystalline composition consisting essentially of 3Y2O3.5Al2O3 on the surfaces of the Al2O3 particles.</p> |
