Method of applying wear-resistant materials to turbine blades, and turbine blades having wear-resistant materials
First Claim
1. A method of applying a wear-resistant hardface alloy to a portion of a turbine blade, comprising:
- placing a thin foil of a brazing alloy over a mating surface of said portion of said turbine blade;
positioning a hardface alloy of a greater-than-desired thickness over said foil, thereby sandwiching the foil between said portion of said turbine blade and said hardface alloy;
heating said portion of said turbine blade, foil, and hardface alloy for a period sufficient to melt said foil and cause bonding of said hardface alloy to said portion of said turbine blade; and
thereafter machining said hardface alloy so as to reduce said greater-than-desired thickness to a desired lesser thickness.
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Accused Products
Abstract
A method of applying a wear-resistant hardface material (alloy) to a portion of a turbine blade, typically a wear surface on a shrouded turbine blade. A thin foil of brazing alloy (which in the preferred embodiment is a nickel-based alloy) is placed over said wear surface, and a hardface alloy of a greater than desired thickness (which in the preferred embodiment is a cobalt-based alloy) is placed thereover, thereby sandwiching the foil therebetween. The wear surface, foil, and hardface material are heated for a period sufficient to melt the foil and cause bonding of the hardface alloy to the wear surface. The hardface material is thereafter machined to bring the wear surface to design tolerances. A turbine blade, and a method of rebuilding a portion of a turbine blade, are also disclosed.
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Citations
22 Claims
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1. A method of applying a wear-resistant hardface alloy to a portion of a turbine blade, comprising:
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placing a thin foil of a brazing alloy over a mating surface of said portion of said turbine blade; positioning a hardface alloy of a greater-than-desired thickness over said foil, thereby sandwiching the foil between said portion of said turbine blade and said hardface alloy; heating said portion of said turbine blade, foil, and hardface alloy for a period sufficient to melt said foil and cause bonding of said hardface alloy to said portion of said turbine blade; and thereafter machining said hardface alloy so as to reduce said greater-than-desired thickness to a desired lesser thickness. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of rebuilding a portion of a turbine blade to manufacturing tolerances, comprising:
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grinding a portion of said turbine blade to form a ground mating surface; placing a thin foil of brazing alloy over said mating surface; positioning a hardface material over said foil, thereby sandwiching the foil between said mating surface and said hardface material; heating said portion of said turbine blade, foil, and hardface alloy so as to melt said brazing alloy and cause bonding of said hardface material to said portion of said turbine blade; and machining said hardface material when bonded to said portion of said turbine blade so as to reduce said greater-than-desired thickness to a desired lesser thickness. - View Dependent Claims (21, 22)
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Specification