Pre-sintered preform for repair of service run gas turbine components
AssigneeSiemens Energy, Inc.
InventorsSomesh J. Ghunakikar, James A. Yarbrough, Mark A. Garcia
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Abstract
A pre-sintered preform (114) and a repair process (100) utilizing the pre-sintered preform (114) are disclosed, each of which result in a brazement (116) comprising a replacement protective coating (118) deposited on a component surface (110). The protective coating (118) exhibits excellent temperature and oxidation resistance, improved adhesion to superalloy surfaces, and reduced depletion over a service life of the associated component (102).
Claims6
A pre-sintered preform (114) comprising a sintered mixture of a bond coat powder and a braze powder, wherein the bond coat powder comprises:
- Ni:
- 33.0-35.0;
- Cr:
- 21.4-23.4;
- Si:
- 8.6-9.2;
- Al:
- 2.4-3.0;
- W 1.2-1.6;
- Ta 0.6-0.8;
- B 0.45-0.65;
- C 0.05-0.15;
- Fe 0.15-0.45;
- and
- Co balance
- and wherein the braze powder comprises by wt %:
- N 32;
- C 21;
- Al 8;
- Y 0.5;
- and
- Co balance.
A bond coat composition comprising by wt %:
- Ni:
- 33.0-35.0;
- Cr:
- 21.4-23.4;
- Si:
- 8.6-9.2;
- Al:
- 2.4-3.0;
- W 1.2-1.6;
- Ta 0.6-0.8;
- B 0.45-0.65;
- C 0.05-0.15;
- Fe 0.15-0.45;
- and
- Co balance.
Dependencies are inferred from the claim text.