Corrosion-resistant coatings for ceramic heat-exchanger tubes operating in highly corrosive environments. Annual report, September 1, 1988-August 31, 1989
Ten ceramic oxide coating systems, including single-layered mullite and multilayered coatings of mullite, zircon, alumina, yttria, and yttria-stabilized zirconia, were exposed to a simulated aluminum reclamation environment at temperatures ranging from 760-1204 C (1400-2200 F) for 2000 hours plus 10 thermal cycles. Corrosion of the silicon carbide tubes increased with decreasing temperature from 1204 C (2200 F) to 760 C (1400 F). Single layer mullite coatings showed superior corrosion resistance, particularly mullite coatings containing a vitreous phase ceramic seal coating on the outer surface. Measurement of silicon carbide tube wall recessions indicated that the coatings which withstood the 2000 hours exposure test without spalling from the substrate were protective, as compared to uncoated silicon carbide tube sections.
- Research Organization:
- Solar Turbines, Inc., San Diego, CA (USA)
- OSTI ID:
- 6186865
- Report Number(s):
- PB-91-136499/XAB; SR--87-R-5334-25; CNN: GRI-5086-232-1233
- Country of Publication:
- United States
- Language:
- English
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Evaluation of ceramic coatings on silicon carbide
FUNCTIONALLY GRADED ALUMINA/MULLITE COATINGS FOR PROTECTION OF SILICON CARBIDE CERAMIC COMPONENTS FROM CORROSION
Related Subjects
360205 -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COATINGS
CORROSION
DOCUMENT TYPES
FLUE GAS
GASEOUS WASTES
HEAT EXCHANGERS
HIGH TEMPERATURE
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MINERALS
MULLITE
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PROGRESS REPORT
PROTECTIVE COATINGS
SILICON CARBIDES
SILICON COMPOUNDS
SMELTERS
THERMAL CYCLING
TRANSITION ELEMENT COMPOUNDS
WASTES
YTTRIUM ADDITIONS
YTTRIUM ALLOYS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES