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US 2007/0181278 A1Published application
Method of removal of cores from niobium-based part
OwnerStephen Bancheri, Frederic Klug +2inventors
InventorsStephen Bancheri, Frederic Klug, Robert Lyons, Joan McKiever
Life of this patent
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Abstract
A system and method for removing an yttria-based core material from a part of a niobium-based material is presented. The yttria-based core material is rapidly removed from the niobium-based part without detrimentally affecting the properties or surface of the part.
Claims22
A method of removing an yttria-based core from a niobium-based part, comprising the step of:
- contacting the yttria-based core with an effective amount of a composition which comprises at least one acid selected from the group consisting of hydrochloric acid, nitric acid, phosphoric acid, nitric/phosphoric acid, sulfuric acid, and acetic acid.
A method of casting a part, comprising the steps of:
- positioning an yttria-based core within a mold;
- introducing a molten niobium-based alloy into the mold to cast a part;
- and
- dissolving the yttria-based core with at least one acid selected from the group consisting of acetic acid, hydrochloric acid, nitric acid, phosphoric acid, nitric/phosphoric acid, and sulfuric acid.
1 more element
A method of forming a turbine blade comprising the steps of:
- casting a blade having at least one passage defined by a core formed of an yttria-type material by pouring a niobium-type material into a mold;
- and
- removing the core from the blade by contacting the core with an acid which comprises at least one acid selected from the group consisting of acetic acid, hydrochloric acid, a nitric acid, a phosphoric acid, a nitric/phosphoric acid, and a sulfuric acid.
Dependencies are inferred from the claim text.