To make a X ray detection performance improved through a post casting inspection in a ceramic core for an investment casing, wherein a reactivity to a super alloy to be used for manufacture of a turbine blade is not relatively shown, a dimensional stability is shown for a long period range even during a directional solidification(DS) operation is carried out, and a removal is made possible by a chemical dissolution operation.
Before sintering of the core, a ceramic core includes an erbium single or an erbium filler composed of a mixture of an erbium single and the second ceramic filler of, for example, an alumina and a binder. After sintering of the core, this ceramic core shows a fine constitution of an erbium-alumina garnet phase and a ceramic filler phase (for example an alumina) which does not take charge of a reaction.
SQUIER DAVID L
FAISON JULIE A
