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Chemical reactivity of calcium aluminate cement bond phases in a steam--CO atmosphere at 199/sup 0/C

Conference · · Am. Ceram. Soc. Bull.; (United States)
OSTI ID:6760445
;
The properties of a dense, approx. = 94% alumina castable were investigated after exposure to a 47.5 steam--52.5 CO (vol %) atmosphere at 3.21 MPa (465 psia) and 199/sup 0/C for 6, 12 and 18 days. Within 6 days, the calcium--aluminate cement-bond phases in both as-dried and fired specimens decomposed to calcium formate, Ca(HCO/sub 2/)/sub 2/, and boehmite, ..cap alpha..-AlO(OH). The flexural strength increased considerably after 6 days and either became constant or decreased slightly at 18 days. During exposure, the apparent porosity decreased from approx. = 20% to approx. = 6%. The flexural strength and porosity after 18 days' exposure were essentially independent of the temperature to which the specimens were fired before exposure.
Research Organization:
Univ. of Missouri, Rolla
OSTI ID:
6760445
Conference Information:
Journal Name: Am. Ceram. Soc. Bull.; (United States) Journal Volume: 57:7
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010404 -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
ALUMINIUM COMPOUNDS
ALUMINIUM HYDROXIDES
ALUMINIUM OXIDES
BONDING
BUILDING MATERIALS
CALCIUM
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CARBOXYLIC ACID SALTS
CASTINGS
CEMENTS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL GASIFICATION
CORROSION
CORROSIVE EFFECTS
CRYOGENIC FLUIDS
ELEMENTS
FABRICATION
FAILURES
FLUIDS
FORMATES
GASIFICATION
HYDROGEN COMPOUNDS
HYDROXIDES
JOINING
MATERIALS
MECHANICAL PROPERTIES
METALS
NITROGEN
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POROSITY
REFRACTORIES
RUPTURES
STABILITY
STEAM
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE