Method for chemically pickling a cast metal part with porous ceramic core(s)
AssigneeSafran Aircraft Engines
InventorsJean Philippe Krebs, Aymeric Bruin
Life of this patent
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Abstract
A method for chemically pickling a cast metal part, including a metal envelope which delimits an inner space in which at least one porous ceramic core is housed, and an outer space, the ceramic core being in fluid communication with the outer space, which method including: filling the pores of the ceramic core with a liquid; and then chemically pickling the cast metal part. This chemical pickling method may be implemented in a method for manufacturing a metal part by investment casting. This method is applicable at least to manufacture of turbine blades for turbomachines and, especially, for aircraft turbojet engines.
Claims13
A method for manufacturing a metal part by investment casting the method, comprising:
- providing a cast metal part comprising a metal envelope which defines an inner space in which at least one porous ceramic core is housed, and an outer space, the at least one porous ceramic core being in fluid communication with the outer space, the step of providing comprising casting a molten metal or metal alloy into a shell mould containing the at least one porous ceramic core, solidifying the metal or metal alloy, and destroying the shell mould;
- and then
- chemically pickling the cast metal part, the chemical pickling comprising:
- filling the pores of the at least one porous ceramic core with a first liquid which does not pickle the cast metal part;
- and then
- chemically pickling the cast metal part with a second liquid which pickles the cast metal part, wherein the first liquid is different from the second liquid.
Dependencies are inferred from the claim text.