Development of improved corrosion- and erosion-resistance coatings for gas-turbine airfoils
The main objective of this program is to obtain a ceramic coating with sufficient density to prevent hot-corrosion element diffusion while accommodating the thermal induced stresses and strain encountered in the gas turbine airfoil application. A secondary objective is to include ceramic coatings for outer air seals and combustor components such as falseheads, crossover tubes, and igniters. In addition, these coatings may directly, or with minor modification, be of major interest for insulating diesel engine combustion zones. The application objective is to significantly enhance diesel and gas turbine engine durability when operating with minimally processed alternative fuels. Both steel tabs and IN-738 pins were used as substrate to be coated with Yttria-stabilized Zirconia using EB-PVD technique. Various bond layers including CoCrAlY, NiCrAlY and NiCoCrAlY were also deposited by PVD in a 100 kW coater followed by glass bead peening and vacuum heat-treatment at 1975/sup 0/F for four (4) hours. ZrO/sub 2/(Y/sub 2/O/sub 3/) top layers were deposited in a 200 kW coater with a pressure barrier system to enable oxygen gas being introduced during the coating process. Results are presented and discussed. (WHK)
- Research Organization:
- Airco Temescal Div., Berkeley, CA (USA)
- DOE Contract Number:
- AC03-78ET12292
- OSTI ID:
- 6426373
- Report Number(s):
- DOE/ET/12292-T1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
AIRFOILS
PROTECTIVE COATINGS
CERAMICS
VAPOR PLATING
COMBUSTORS
GAS TURBINES
SILICON OXIDES
ZIRCONIUM OXIDES
CORROSION PROTECTION
CORROSION RESISTANCE
DIESEL ENGINES
EQUIPMENT
EROSION
HEAT TREATMENTS
MICROSTRUCTURE
STEELS
YTTRIUM OXIDES
ALLOYS
CHALCOGENIDES
COATINGS
CRYSTAL STRUCTURE
DEPOSITION
ENGINES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
IRON ALLOYS
IRON BASE ALLOYS
MACHINERY
OXIDES
OXYGEN COMPOUNDS
PLATING
SILICON COMPOUNDS
SURFACE COATING
TRANSITION ELEMENT COMPOUNDS
TURBINES
TURBOMACHINERY
YTTRIUM COMPOUNDS
ZIRCONIUM COMPOUNDS
200104* - Fossil-Fueled Power Plants- Components
330100 - Internal Combustion Engines
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360205 - Ceramics
Cermets
& Refractories- Corrosion & Erosion