Creep of 90+ % Al/sub 2/O/sub 3/ refractory concrete

Journal Article · Tue Jul 01 04:00:00 EDT 1980 · Am. Ceram. Soc. Bull.; (United States)

OSTI ID:5156561

Bray, D J; Smyth, J R; McGee, T D

Uniaxial compressive creep of a 90+ % Al/sub 2/O/sub 3/ refractory concrete composed of a high purity tabular alumina aggregate phase and a high purity calcium-aluminate cement phase was investigated. Steady-state creep was measured under stresses of 6.9 to 17.2 MPa at 538/sup 0/ to 1204/sup 0/C. Creep of the pure calcium-aluminate cement was also investigated under stresses of 6.9 to 13.8 MPa at 538/sup 0/ to 1149/sup 0/C. Activation energy for creep of the concrete was found to be approx. = 171 KJ/mol, while for the cement it was approx. = 134 KJ/mol. Both values were determined from steady-state strain rates at 13.8 MPa. The stress exponent was found to be approx. = 1.7 at 1093/sup 0/C for the concrete and approx. = 2.3 at 982/sup 0/C for the cement. These activation energies and stress exponents are appropriate only for steady-state creep over the conditions tested. SEM microscopy and porosity and density data were used to gain insight into creep behavior and possible creep mechanisms of this system.

• Research Organization: Iowa State Univ., Ames
• OSTI ID: 5156561
• Journal Information: Am. Ceram. Soc. Bull.; (United States), Journal Name: Am. Ceram. Soc. Bull.; (United States) Vol. 59:7; ISSN ACSBA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404 -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALKALINE EARTH METAL COMPOUNDS
ALUMINATES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BONDING
BUILDING MATERIALS
CALCIUM COMPOUNDS
CHALCOGENIDES
COAL GASIFICATION
CONCRETES
CREEP
FABRICATION
GASIFICATION
JOINING
MATERIALS
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
REFRACTORIES
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES