Method of applying environmental and bond coatings to turbine flowpath parts
AssigneeGeneral Electric Company
InventorsKarl Lee Borneman, Thomas J. Tomlinson, Raymond Heldorn
Life of this patent
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Abstract
A method for coating an article such as a turbine engine shroud with an environmental or bond coating, such as a MCrAlY composition, to produce a surface finish suitable for machining to predetermined dimensions and specifications. The method of applying an environmental or bond coating uses a thermal spray process such as hyper velocity oxygen fuel (“HVOF”) to produce a thick and reasonably uniform coating which can be machined to desired dimensions while still providing key quality characteristics required to protect the coated parts in a high temperature, oxidative and corrosive atmosphere and permitting application of long life thermal barrier topcoats.
Claims20
A method for applying a thermal spray coating to a flowpath part of a gas turbine engine, the method comprised of the steps of:
- providing a flowpath part of a gas turbine engine having a flowpath face, at least one side edge, and at least one rear edge;
- inserting the flowpath part into a holding apparatus, the holding apparatus comprising a turntable having at least one mounting block mounted thereon, the at least one mounting block including at least one side plate for adjustably holding the flowpath part in a desired orientation, the at least one mounting block further including tightening means for adjusting the position of the at least one side plate;
- placing a backing in substantial contact with the rear edge of the flowpath part, the backing further in contact with the mounting block;
- operating the tightening means to compress the backing to seal the backing to the rear edge of the flowpath part while leaving the at least one side edge exposed;
- and
- applying an initial base coating to the at least one side edge by thermal spraying.
Dependencies are inferred from the claim text.