Method of casting with improved detectability of subsurface incl

Details Method of casting with improved detectability of subsurface incl Method of casting with improved detectability of subsurface incl

1997-10-30

1999-11-02

Pyon, Harold

Metal founding

Process

Shaping liquid metal against a forming surface

164517, 164519, 164 41, B22D 4600, B22C 102

Patent

active

059751886

ABSTRACT:
Method of making a casting by investment casting of a metal or alloy, especially titanium and its alloys, in a ceramic investment shell mold in a manner to provide enhanced x-ray detectability of any sub-surface ceramic inclusions that may be present below exterior surfaces of the casting. The method involves forming a ceramic mold facecoat and/or back-up layer including erbia or other x-ray or neutron-ray detectable ceramic component. The facecoat/back-up layer is/are formed using a ceramic slurry comprising erbia and other optional ceramic particulates, an inorganic binder, and an inorganic pH control agent. The slurry is applied to a pattern of component to be cast to form the mold. A metal or alloy is cast in the mold, and the solidified casting is removed from the mold. The casting is subjected to radiography to detect any sub-surface ceramic inclusions below the exterior surface thereof not detectable by visual inspection of the casting.

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