Rub Tolerant Materials Development. Nickel-Chromium-Aluminum for Use as a Transpiration-Cooled High Pressure Turbine Abradable Seal.
Final rept. Jun 76-Apr 77,
UNION CARBIDE CORP PARMA OHIO PARMA TECHNICAL CENTER
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A transpiration-cooled, high pressure gas turbine shroud was designed, built, and rig tested. The shroud consisted of a porous rub tolerant material, nickel-chromium-aluminum NiCrAl which was brazed to a flow controlcooling gas distribution chamber. The NiCrAl layer was optimized for abradability and thermal stability. A flow control chamber was designed which controlled the amount and distribution of the cooling gas flow to the rub tolerant layer. The shroud was tested for cyclic oxidation resistance and high velocity, hot gas erosion stability. Optimization of the system for maintaining a 1900 F 1040 C surface temperature in a high velocity, 2600 F 1427 C gas stream was achieved by using a combination of thermal conduction and transpiration cooling mechanisms. Author
- Coatings, Colorants and Finishes
- Metallurgy and Metallography
- Jet and Gas Turbine Engines