High stiffness airoil and method of manufacture
First Claim
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1. An apparatus comprising a single-cast metallic airfoil structure having a high stiffness metallic core positioned therein and coupled with said structure.
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Abstract
A cast metallic airfoil structure having a high stiffness core positioned therein for increasing the stiffness of the airfoil. In one embodiment, the high stiffness core is preferably formed of gamma titanium aluminde or a titanium metal matrix composite and is metallurgically bonded to the cast metallic airfoil structure. In one form the airfoil structure forms a portion of an integrally bladed rotor, and in a second form the airfoil structure has a dove tail attachment portion.
65 Citations
42 Claims
- 1. An apparatus comprising a single-cast metallic airfoil structure having a high stiffness metallic core positioned therein and coupled with said structure.
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18. An airfoil, comprising:
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a high stiffness metallic core member; and
a cast metallic monolithic structure having said high stiffness core member positioned within and fixedly coupled thereto, wherein the high stiffness metallic core member has a modulus of elasticity greater than the modulus of elasticity of the cast metallic monolithic structure and wherein the airfoil has a modulus of elasticity greater than the modulus of elasticity of said cast metallic monolithic structure. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. An apparatus, comprising:
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a stiffening core formed of a material selected from a group consisting of metal matrix composites and gamma titanium aluminide; and
a cast metallic structure having an outer surface defining an airfoil, said cast metallic structure formed around and connected to said stiffening core, wherein said cast structure substantially encloses said first stiffening core. - View Dependent Claims (33, 34, 35, 36)
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37. A method for fabricating an airfoil, comprising:
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providing a high stiffness member and a casting mold having a cavity adapted for forming an airfoil shaped structure therein;
positioning the high stiffness member within the cavity;
casting a metal structure around the high stiffness member after said positioning; and
forming a metallurgical bond between the metal structure and the high stiffness member after said casting. - View Dependent Claims (38, 39, 40, 41, 42)
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Specification