Changes in hot corrosion due to composition modifications in CoCrAlY coatings

Conference · Thu Oct 01 04:00:00 EDT 1981

OSTI ID:5811508

Prater, J T; Patten, J W; Hays, D D; Moss, R W; Fairbanks, J W

Burner rig and engine test which describe differences in the hot corrosion resistance of sputter deposited CoCrAlY coatings with varied compositions and coating designs are presented. The objective of this study is to determine the potential of modifying CoCrAlY coatings to provide significantly longer lifetimes for gas turbine engine components operating on alternative fuels or in marine environments. Modified coatings that contain a high chromium surface composition, a gradient in chromium and aluminum composition, and a platinum underlayer or graded platinum addition have been examined. Twenty-nine different samples have been burner rig tested for 500 h at 677/sup 0/C (1250/sup 0/F) in an aggressive, marine-type hot corrosion environment and then ranked according to their performance. Also, four chromium rich coatings have been tested for 20 h in a Rolls Royce Olympus C turbine engine operated at 1067/sup 0/C on residual fuels. Results from these tests indicate that a high chromium surface composition and composition gradients through the coating thickness can improve the hot corrosion resistance of coatings in aggressive, low temperature environments.

• Research Organization: Pacific Northwest Lab., Richland, WA (USA); Department of Energy, Washington, DC (USA). Office of Coal Utilization
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 5811508
• Report Number(s): PNL-SA-9671; CONF-810885-2; ON: DE82005230
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330103* -- Internal Combustion Engines-- Turbine
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
COATINGS
COBALT ALLOYS
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
DATA
ENGINES
EXPERIMENTAL DATA
GAS TURBINE ENGINES
HEAT ENGINES
INFORMATION
INTERNAL COMBUSTION ENGINES
NUMERICAL DATA
TEMPERATURE DEPENDENCE
TURBINE BLADES
YTTRIUM ALLOYS