Method of coating gas turbine components
AssigneeGeneral Electric Company
InventorsBhupendra Gupta, Nripendra Das, Mathew Saylor, Robert Zimmerman
Life of this patent
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Abstract
A method of forming a metal coating on surfaces of internal passages of a turbine part includes applying a nickel aluminum bond coating to an external surface of the turbine part, positioning the turbine part in a VPA chamber, coupling a gas manifold to at least one internal passage inlet, and coating at least a portion of the internal surface and the external of the turbine part by a vapor phase aluminiding (VPA) process using metal coating gases to form a coating on the internal surfaces of the turbine part.
Claims18
A method of forming a metal coating on surfaces of internal passages of a turbine part, the turbine part having an outer surface and comprising at least one internal passage, said method comprising:
- applying a nickel aluminum bond coating to an external surface of the turbine part;
- positioning the turbine part in a VPA chamber;
- coupling a gas manifold to at least one internal passage inlet;
- exposing the turbine part to a low activity chromium and aluminum donor alloy;
- and
- coating at least a portion of the internal surface of the turbine part by a vapor phase aluminiding (VPA) process to form a nickel aluminide coating of on at least a portion of the external surfaces of the turbine component, the nickel aluminide coating having a composition of approximately twenty four weight percent aluminum, approximately six weight percent of chromium, and approximately two weight percent of Zirconium.
A method of forming a metal coating on surfaces of internal passages of a turbine part, the turbine part having an outer surface and comprising at least one internal passage, said method comprising:
- applying a nickel aluminum bond coating to an external surface of the turbine part;
- positioning the turbine part in a VPA chamber;
- coupling a gas manifold to at least one internal passage inlet;
- flowing gases through the manifold and into the at least one internal passage to form a coating on the surfaces of the at least one internal passage;
- and
- pumping metal reagent gases into the VPA chamber to form a coating on the external surface of the turbine part.
Dependencies are inferred from the claim text.