Exploratory Development of an Overhaul Coating Process for Gas Turbine Proponents.
Final technical rept. May 76-Mar 78,
GENERAL MOTORS CORP INDIANAPOLIS IND DETROIT DIESEL ALLISON DIV
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The purpose of this program was to demonstrate the feasibility of a single diffusion coating process which may be used for re-application of aluminide protective coatings to various superalloy turbine components during overhaul of Air Force aircraft gas turbine engines. The electrophoretic coating process developed by Detroit Diesel Allison Division, General Motors Corporation was chosen as the program coating procedure for the five task development effort. An Al, Cr, Mn coating, identified as AEP 32, was successfully applied to four program alloys, C1023, B1900, Rene 80 and Alloy 713C. In addition, a comprehensive test program was conducted to comparatively evaluate the environmental performance and mechanical properties of the program alloys coated with AEP 32 and their respective production coatings. The AEP 32 coating on all alloys demonstrated excellent environmental performance without degradation of mechanical properties as compared to production coatings. A chemical stripping procedure was developed for removing the service coatings without significant substrate attack. A variety of engine components were stripped and recoated as demonstration parts. In addition, documentation for recoating overhaul turbine components is given. Author
- Coatings, Colorants and Finishes
- Jet and Gas Turbine Engines