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Stability of the refractory-bond phases in high alumina refractories in steam--CO atmospheres

Conference · · Am. Ceram. Soc. Bull.; (United States)
OSTI ID:6556319
;
The chemical resistance of the bond phases in a dense fired alumina, phosphate-bonded ramming mix and calcium aluminate cement-bonded castable to five steam--CO atmospheres at 385, 750, and 1015 psia and approx. = 260 and approx. = 950/sup 0/C was evaluated from physical property changes, x-ray diffraction, DTA/TGA and Auger electron spectroscopy. A decrease in the modulus of rupture for the dense fired alumina exposed to steam-containing atmospheres at approx. = 260/sup 0/C corresponded to an increase in Ca segregation at the external surfaces. The AIPO/sub 4/-bond phase was sensitive to saturated steam only. The calcium aluminate cement-bond phases reacted to form CaCO/sub 3/, Ca(HCO/sub 2/)/sub 2/, AIO(OH) (boehmite) and hydrated calcium aluminate phases.
Research Organization:
Univ. of Missouri, Rolla
OSTI ID:
6556319
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
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360205* -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBON
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CASTINGS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL GASIFICATION
CORROSION
CORROSION RESISTANCE
CORROSIVE EFFECTS
CRYOGENIC FLUIDS
CRYSTAL STRUCTURE
ELEMENTS
FAILURES
FLUIDS
GASIFICATION
HYDROGEN
MICROSTRUCTURE
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PHOSPHORUS OXIDES
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
REFRACTORIES
RUPTURES
STEAM
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES