Practical Implications of the Use of Aluminide Coatings for the Corrosion Protection of Superalloys in Gas Turbines
GEC TURBINE GENERATORS LTD WHETSTONE (UNITED KINGDOM)
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The primary objective of this paper is to consider in some detail the nature of the difficulties incurred in the pack aluminising of superalloys, especially in terms of prolonging component life without prejudice to performance, integrity and safety of the engine. The paper will first of all review the objectives and requirements of using aluminide coatings, the processes currently commercially available, the compatability of aluminide coatings with various superalloys substrates as well as the more general question of overall quality control of both the coating and the coated component. The properties of coatings themselves will be considered in terms of their corrosion resistance, overall thermal and structural stability, and effect on the mechanical properties of the substrate. Finally, the problems of long term corrosion protection will be examined in terms of the practicalities of reclaiming and recoating of ex-service turbine parts with view to extending component life and conservation of critical materials.
- Coatings, Colorants and Finishes