High temperature behaviour of silicon carbide and aluminium oxide ceramics in coal and residual-oil slags
Ceramic tubes made of aluminium oxide, sialon, and several commercial silicon carbides were exposed for about 500 h at 1200 to 1220 C to the combustion products from either No. 6 fuel oil or a mixture of 10% bituminous coal in No. 6 fuel oil (COM). After exposure to combustion products from No. 6 fuel oil, the linear thermal expansion at 1000 C for sintered ..gamma..chemically bond-SiC was 17% greater than it was before the experiment. For CVD SiC and siliconized SiC, there was no change. For alumina, it decreased by about 30%. When exposed to COM combustion products, the thermal expansion of the ..gamma..chemically bond-SiC increased slightly, and that of siliconized KT SiC increased by about 16% at 1000 C. Significant thermal expansion differences were observed between the upstream and downstream sides of the tubes for sintered ..gamma..chemically bond-SiC, the KT SiC, and the alumina. The strength after exposure for ..cap alpha..-SiC decreased by about 4%; the others remained unchanged. The helium permeability increased after exposure. The greatest increase occurred for tubes exposed only to residual fuel oil. 6 references.
- OSTI ID:
- 6458496
- Journal Information:
- Ceram. Eng. Sci. Proc.; (United States), Vol. 2:11/12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
02 PETROLEUM
ALUMINIUM OXIDES
MATERIALS TESTING
MECHANICAL PROPERTIES
FUEL OILS
COMBUSTION
FUEL SLURRIES
SILICON CARBIDES
SLAGS
CORROSIVE EFFECTS
CERAMICS
COAL
COMPARATIVE EVALUATIONS
FRACTURE PROPERTIES
HELIUM
PERMEABILITY
TEMPERATURE EFFECTS
THERMAL EXPANSION
TUBES
VERY HIGH TEMPERATURE
ALUMINIUM COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
DISPERSIONS
ELEMENTS
ENERGY SOURCES
EXPANSION
FLUIDS
FOSSIL FUELS
FUELS
GASES
LIQUID FUELS
MATERIALS
MIXTURES
NONMETALS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PETROLEUM PRODUCTS
RARE GASES
SILICON COMPOUNDS
SLURRIES
SUSPENSIONS
TESTING
THERMOCHEMICAL PROCESSES
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties
014000 - Coal
Lignite
& Peat- Combustion
025000 - Petroleum- Combustion