초록 ▼

A method for repairing the shroud surfaces of a gas turbine engine to provide corrosion and oxidation resistance of the shroud segments while also restoring the dimensional integrity of the shroud segments. The method entails removing the oxidation and corrosion products from the shroud segment, rem

A method for repairing the shroud surfaces of a gas turbine engine to provide corrosion and oxidation resistance of the shroud segments while also restoring the dimensional integrity of the shroud segments. The method entails removing the oxidation and corrosion products from the shroud segment, removing preexisting coating materials, applying a material compatible with the shroud segment substrate material, machining the surface, applying a corrosion-resistant, oxidation-resistant and rub-compliant material to the shroud segment using a HVOF process, machining the shroud segment to preselected dimensions and applying an aluminide coating for improved oxidation and corrosion resistance of the repaired surfaces.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method for repairing turbine shrouds having a plurality of segments removed from service by restoring corrosion resistance, oxidation resistance and dimensional characteristics to the shroud segments, each shroud segment having a flow path surface, a forward rail, an

[ What is claimed is:] [1.]1. A method for repairing turbine shrouds having a plurality of segments removed from service by restoring corrosion resistance, oxidation resistance and dimensional characteristics to the shroud segments, each shroud segment having a flow path surface, a forward rail, an aft rail, a left side and a right side, comprising the steps of:cleaning the turbine shroud segment removed from service to remove loose surface contamninants;removing preapplied coating materials from the shroud segment surfaces to be repaired;applying a first material compatible with the shroud segment substrate material to fill existing voids on surfaces to be repaired;machining the repaired surface to achieve a smooth surface;then, HVOF spraying a powder of a corrosion-resistant, oxidation-resistant and rub-tolerant material to the side surfaces of the shroud segments and the flow path surface to restore the original dimensions of the flow path surface of the shroud segment using a high velocity oxyfuel process;then, machining each shroud segment to preselected dimensions; andapplying an aluminide for improved corrosion and oxidation resistance over the surfaces of the fore and aft rails and the surfaces of the shroud flow path surfaces.