Metal working – Method of mechanical manufacture – Impeller making
Reexamination Certificate
2007-06-19
2007-06-19
Cozart, Jermie E. (Department: 3726)
Metal working
Method of mechanical manufacture
Impeller making
C029S402010, C029S402020, C029S402090, C029S402160, C029S402180
Reexamination Certificate
active
10892136
ABSTRACT:
A method of reconditioning a rotating blade (1) with a shroud (8) following the operation in a gas turbine, includes the application of a barrier (14) placed on the edge of the shroud (8) facing the edge of a shroud (8) of an adjacent blade having creep deformation. The barrier (14) prevents hot gas ingestion into a shroud cavity (10). It is pre-fabricated or built-up layer-by-layer by welding or laser cladding or other methods. Additionally, the mass of the shroud (8) is reduced in order to re-establish the initial mass of the shroud. A thermal barrier coating (15) is additionally applied to the surfaces of the shroud (8) that are exposed to the hot gas of the turbine. The method significantly increases the lifetime of the blade (1).
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Search Report from EP 03 40 5557.4 (Dec. 18, 2003).
Search Report from EP 04 10 3356 (Dec. 27, 2004).
Boegli Andreas
Ritchie James George
Slowik Slawomir
Stuessi Heinrich
ALSTOM Technology Ltd.
Cermak Adam J.
Cermak & Kenealy LLP
Cozart Jermie E.
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