Method for removing Y.sub.2 O.sub.3 or Sm.sub.2 O.sub.3 cores fr

Details Method for removing Y.sub.2 O.sub.3 or Sm.sub.2 O.sub.3 cores fr Method for removing Y.sub.2 O.sub.3 or Sm.sub.2 O.sub.3 cores fr

1977-03-09

1978-10-10

Caroff, Marc L.

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 10, 134 28, 134 30, 134 41, 164131, 164132, 423 21, B08B 308, B08B 704

Patent

active

041194373

ABSTRACT:
A weakly acid solution of either NH.sub.4 NO.sub.3, NH.sub.4 Cl, NH.sub.4 HSO.sub.4, CH.sub.3 COOH or equimolar CH.sub.3 COOH -- CH.sub.3 COONa is employed to remove cores of either Y.sub.2 O.sub.3 or Sm.sub.2 O.sub.3 from castings of advanced superalloy materials. A molten salt bath may be used thereafter to remove reaction products formed by the reaction of the materials of the core and the metal casting.

REFERENCES:
patent: 3694264 (1972-09-01), Weinland et al.
patent: 3727670 (1973-04-01), Bailey
patent: 4043377 (1977-08-01), Mazdiyasni
patent: 4043381 (1977-08-01), Mazdiyasni et al.

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