Repair of HPT shrouds with sintered preforms

Details Repair of HPT shrouds with sintered preforms Repair of HPT shrouds with sintered preforms

2006-03-22

2010-02-02

Bryant, David P (Department: 3726)

Metal working

Method of mechanical manufacture

Impeller making

C029S402090, C029S402160, C228S119000

Reexamination Certificate

active

07653994

ABSTRACT:
A method for repairing a gas turbine stationary flowpath shroud. The method comprises providing a superalloy gas turbine stationary flowpath shroud that has previously been in service. The method further comprises preparing a restoration coating for application to the flowpath surface of the shroud by the steps of providing a precursor mixture comprising a higher-melting-point alloy component, a lower-melting-point alloy component, and a fugitive binder. A perform is prepared from the components and pre-sintered into a mildly curved form. The partially densified perform is applied to the flowpath surface and thermally bonded to the flowpath surface, forming a restoration coating.

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