Method of attaching ceramics to gas-turbine metal components
When attaching ceramics to metal gas-turbine parts, an interlayer of lowmodulus fiber metal is recommended as a buffer layer to compensate for the different coefficients of thermal expansion. This elastic interlayer, made of matted and sintered metallic fibers, is actually a woven mat with 90% of the volume taken up by porosity. Nickel alloys, Hastelloy-X, Inconel-600, FeCrAlSi, and FeCrAlY can be used for the interlayer. However, the last two alloys provide optimum oxidation and high-temperature-corrosion resistance. The interlayers are attached to the component metal by normal brazing, while the ceramic is attached by plasma spraying. The bond between the ceramic and the interlayer is formed by the penetration and condensation of the sprayed powder in the interlayer pores. This joining method can be most efficiently used in high-pressure-turbine seals; combustion-chamber facings; facings of slag hoppers and boosted steamboiler combustion chambers; coal gasification equipment, including valves, cyclones, transport main pipelines and exhaust valves; cylinder heads; and diesel engine pistons.
- OSTI ID:
- 6120175
- Journal Information:
- Sov. Energy Tech.; (United States), Journal Name: Sov. Energy Tech.; (United States) Vol. 1; ISSN SETED
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
200104 -- Fossil-Fueled Power Plants-- Components
36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALLOYS
ALUMINIUM ALLOYS
BRAZING
CERAMICS
CHROMIUM ALLOYS
COATINGS
COBALT ALLOYS
DEPOSITION
ELASTICITY
EXPANSION
FABRICATION
FIBERS
GAS TURBINES
HASTELLOY X
HASTELLOYS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCONEL 600
INCONEL ALLOYS
INTERFACES
IRON ALLOYS
JOINING
MACHINERY
MATERIALS
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
PLASMA ARC SPRAYING
PROTECTIVE COATINGS
SPRAY COATING
SURFACE COATING
TENSILE PROPERTIES
THERMAL EXPANSION
TUNGSTEN ALLOYS
TURBINES
TURBOMACHINERY
WELDING
YTTRIUM ALLOYS