Methods for coating and securing multi-vane nozzle segments

Details Methods for coating and securing multi-vane nozzle segments Methods for coating and securing multi-vane nozzle segments

1995-05-22

1997-06-10

Cuda, Irene

Metal working

Method of mechanical manufacture

Impeller making

2988921, B23P 1500

Patent

active

056364393

ABSTRACT:
Nozzle segments in the form of singlets having radial outer and inner walls with a single vane therebetween are coated with a base coat of nickel, chromium, aluminum and yttrium and prevent oxidation of the base metal. A finish coat of yttrium-stabilized zirconia is applied for anti-oxidation and anti-corrosion purposes. The singlets are welded to one another adjacent the abutting margins of the outer and inner walls. Electron beam welding is used to fuse the material of the walls together to a depth which does not penetrate the coating on the wall surfaces of the segments forming the hot gas path components of the turbine.

REFERENCES:
patent: 4602412 (1986-07-01), Partington et al.
patent: 4827588 (1989-05-01), Meyer
patent: 5174715 (1992-12-01), Martin

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