摘要：

A ceramic core that includes, prior to core sintering, erbia filler material alone or admixed with a second ceramic filler material, such as alumina, and a binder to provide a core that is relatively non- reactive with superalloys used in the manufacture of turbine blades, dimensionally stable during directional solidification (DS) for extended times, removable by chemcial leaching techniques, and having enhanced X- ray detectable during post-cast inspection operations. After core sintering, the ceramic core has a microstructure comprising an erbia- alumina garnet phase and an unreacted ceramic filler phase (e.g. alumina).

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