Stability of refractory castables to steam-N/sub 2/ and steam-CO atmospheres
The properties of three refractory castables, designated as high, intermediate, and low Al/sub 2/O/sub 3/, were investigated after the castables had been exposed to steam-N/sub 2/ and steam-CO atmospheres at 199/sup 0/C and 450 psi for 6, 12, and 18 days. Four general chemical reactions were identified. First, the residual unreacted calcium aluminate cement compounds in the castables reacted with the steam to form additional cementitous material. This reaction was considered primarily responsible for the observed increase in mechanical strength of the castables. Second, a portion of the cement bond in the castables was destroyed by the CO, CO/sub 2/, and H/sub 2/O in the test atmospheres, as evidenced by the reaction of CaO to form CaCO/sub 3/ and Ca(HCO/sub 2/)/sub 2/. Third, the free Al/sub 2/O/sub 3/ in the castables hydrated to form boehmite. A volume expansion accompanied this reaction. Fourth, a portion of the free SiO/sub 2/ was removed from the SiO/sub 2/-containing castables by reacting with the steam.
- Research Organization:
- Los Alamos Scientific Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 7311397
- Report Number(s):
- LA-6508-T
- Country of Publication:
- United States
- Language:
- English
Similar Records
Stability of refractory castables in steam--N/sub 2/ and steam--CO atmospheres at 199/sup 0/C
Stability of the refractory-bond phases in high alumina refractories in steam--CO atmospheres
Chemical and physical stability of refractories for use in coal gasification. Third annual progress report, May 1, 1978-April 30, 1979
Conference
·
Fri Jul 01 00:00:00 EDT 1977
· Am. Ceram. Soc. Bull.; (United States)
·
OSTI ID:7094931
Stability of the refractory-bond phases in high alumina refractories in steam--CO atmospheres
Conference
·
Sat Jul 01 00:00:00 EDT 1978
· Am. Ceram. Soc. Bull.; (United States)
·
OSTI ID:6556319
Chemical and physical stability of refractories for use in coal gasification. Third annual progress report, May 1, 1978-April 30, 1979
Technical Report
·
Tue May 22 00:00:00 EDT 1979
·
OSTI ID:5841276
Related Subjects
36 MATERIALS SCIENCE
360402 -- Polymers & Plastics-- Structure & Phase Studies-- (-1987)
360403* -- Materials-- Polymers & Plastics-- Mechanical Properties-- (-1987)
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BUILDING MATERIALS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CASTING
CEMENTS
CHALCOGENIDES
CHEMICAL REACTIONS
FABRICATION
MATERIALS
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
STRUCTURAL CHEMICAL ANALYSIS
360402 -- Polymers & Plastics-- Structure & Phase Studies-- (-1987)
360403* -- Materials-- Polymers & Plastics-- Mechanical Properties-- (-1987)
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BUILDING MATERIALS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CASTING
CEMENTS
CHALCOGENIDES
CHEMICAL REACTIONS
FABRICATION
MATERIALS
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
STRUCTURAL CHEMICAL ANALYSIS