Dip process thermal-barrier coatings for superalloys. Final report 1 Jul 79-30 Jun 80
A new technique of developing thermal-barrier coatings for superalloys has been investigated. It involves hot dipping of superalloy samples into a molten bath of low melting Ce-Co or Ce-Ni alloy. By internally oxidizing these coatings, it is possible to obtain a duplex with a CeO2-rich oxide scale as the outer layer (thermal barrier) and an inner layer composite of fine cerium oxide particles dispersed in a matrix of Ni(Co)CrAl. This inner layer, or subscale, grades into the superalloy. Appropriate heat treatment can produce recrystallized CeO2 particles in the subscale that should improve adherence of the oxide scale to the subscale and substrate superalloy. The coating process does involve limited reaction between the coating alloy and superalloy. The thickness of this interaction zone can be controlled and compensated for in the design (cross section) of the superalloy component.
- Research Organization:
- SRI International, Menlo Park, CA (USA)
- OSTI ID:
- 6464899
- Report Number(s):
- AD-A-116107/4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HEAT RESISTING ALLOYS
DIP COATING
THERMAL INSULATION
CERIUM ALLOYS
CERIUM COMPOUNDS
COBALT ALLOYS
CRACKS
CROSS SECTIONS
ELECTRON MICROSCOPY
HEAT TREATMENTS
HOT DIPPING
HOT WORKING
LAYERS
LOW TEMPERATURE
MICROSTRUCTURE
NICKEL ALLOYS
PROCESSING
SUBSTRATES
THICKNESS
ALLOYS
CRYSTAL STRUCTURE
DEPOSITION
DIMENSIONS
FABRICATION
HEAT RESISTANT MATERIALS
MATERIALS
MATERIALS WORKING
MICROSCOPY
RARE EARTH ALLOYS
RARE EARTH COMPOUNDS
SURFACE COATING
360101* - Metals & Alloys- Preparation & Fabrication