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Gas Turbine Repair Technology tive to GT-29TM, GT-33TM offers a significant im- provement in high temperature oxidation re- sistance and improved ductility and crack prop- agation resistance. On the other hand, a reduc- tion in chromium content results in some loss of hot corrosion resistance relative to GT-29TM. Type II low temperature corrosion and Type I high temperature corrosion may occur when al- kali metal salts condense on a part surface and destroy the normally protective oxide scale. Low temperature corrosion is only a concern where temperatures are below 1350°–1400°F, but it has a high rate of attack. Type 1 corrosion would only be a concern in the temperature range 1400°–1700°F where contaminants are present. Chromide pack coatings are effective barriers to Type II corrosion. material temperature and mitigates the effects of hot streaking or uneven gas temperature dis- tributions. TBC characteristics and advantages of TBCs are listed in Table 6. Characteristics • 15-25 mil Thickness • Insulating-porous • Plasma sprayed in air • Two layers bond coat - NiCrAlY top coat - Yttria-stabilized Zirconia Advantages • Reduces metal temperature of cooled compo- nents • 8-16°F Reduction per mil of coating Coating Type Composition Oxidation Resistance Type I Corrosion Resistance Type II Corrosion Resistance GT-29 CoCrAlY Poor Excellent Poor GT-33 CoNiCrAlY Good Good Poor GT-29IN- PLUS CoCrAlY + internal and external aluminide Very good Execellent Poor Chromide Coating Cr Poor Good Very good Table 5. Coating applications Either of these repair coating systems can be ap- plied with the addition of an over-aluminide. The combination of Extendcoat with over-alu- minide is identified with a PLUSTM designation. Buckets with internal air cooling may require the over-aluminide be reapplied to the internal passages as well. The designation for buckets with internal and external aluminide coatings is IN-PLUSTM. The aluminide is provided to en- hance oxidation resistance. Thermal Barrier Coatings Thermal barrier coatings (TBCs) are reapplied to combustion components to provide an insu- lating layer that reduces the underlying base Table 6. TBC coating GE emphasizes the importance of applying TBC robotically to ensure quality and repeat- ability not available with manually applied coat- ings. An operator, encumbered with the re- quired protective gear, cannot come close to the accuracy and repeatability in terms of plas- ma gun distance and traverse speed to that of robotically applied coatings. Figures 26 through 28 display robotic coating operations per- formed at one of GE’s service centers. GE’s service center network has standardized its coating equipment and robotic capability with Figure 26. Robotic application of TBC on MS7001E transition piece GE Power Systems ■ GER-3957B ■ (04/01) 16PDF Image | Gas Turbine Repair Technology GE
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