Furnace atmosphere effects on casting of eutectic superalloys
Journal Article
·
· Metall. Trans., A; (United States)
Control of furnace atmosphere is a key factor in the use of silica-bonded alumina shell molds for the directional solidification of eutectic superalloys reinforced with tantalum monocarbide whiskers. The use of a furnace atmosphere which is simultaneously oxidizing to aluminum in the eutectic alloy and reducing to silica phases in the mold results in the formation of an alumina barrier layer in situ at the metal/mold interface and an absence of silica phases in the mold region adjacent to this barrier layer. The presence of this microstructure permits castings of eutectics at metal temperatures up to 1750/sup 0/C.
- Research Organization:
- General Electric Co., Schenectady, NY
- OSTI ID:
- 5649347
- Journal Information:
- Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 11:2; ISSN MTTAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
20 FOSSIL-FUELED POWER PLANTS
200104 -- Fossil-Fueled Power Plants-- Components
36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ARGON
ATMOSPHERES
CARBIDES
CARBON COMPOUNDS
CASTING
CASTING MOLDS
CHALCOGENIDES
CONTROLLED ATMOSPHERES
CRYSTAL STRUCTURE
ELEMENTS
FABRICATION
FURNACES
GAS TURBINES
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MACHINERY
MICROSTRUCTURE
MINERALS
MULLITE
NICKEL ALLOYS
NICKEL BASE ALLOYS
NICKEL CARBIDES
NICKEL COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RARE GASES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
TANTALUM CARBIDES
TANTALUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TURBINES
TURBOMACHINERY
200104 -- Fossil-Fueled Power Plants-- Components
36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ARGON
ATMOSPHERES
CARBIDES
CARBON COMPOUNDS
CASTING
CASTING MOLDS
CHALCOGENIDES
CONTROLLED ATMOSPHERES
CRYSTAL STRUCTURE
ELEMENTS
FABRICATION
FURNACES
GAS TURBINES
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MACHINERY
MICROSTRUCTURE
MINERALS
MULLITE
NICKEL ALLOYS
NICKEL BASE ALLOYS
NICKEL CARBIDES
NICKEL COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RARE GASES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
TANTALUM CARBIDES
TANTALUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TURBINES
TURBOMACHINERY