"Creep is a major mechanism of failure for many refractory materials. Refractories synthesized from raw materials contain vitreous secondary phases which cause creep problems. A creep test was utilized to test specimens in order to understand the mechanisms which take place at high temperature through determination of the creep rates, activation energies, and stress exponents of the specimens.
Several techniques were used to analyze the specimens before and after creep testing, including X-ray diffraction (XRD), reflective light microscopy (RL), and scanning electron microscope/energy dispersive spectroscopy (SEM/EDS). Morphologies of spinel and secondary phases were observed in all of the test specimens and each are described in detail. Correlations between microstructure and creep rates are also discussed in detail.
Specimens in the Guyana #4 series, Chinese #1 series, and Missouri diaspore #1 series were creep tested at 1350°C to determine their steady state creep rates. The lowest creep rate was obtained for the Guyana #4-2 specimen, 0.2 %/hr. The lowest creep resistance was associated with the Missouri #1 diapsore series. The Guyana #4 bauxite may be used for some refractory applications, while the Chinese #1 series and Missouri #1 series contain too much glass leading, to poor creep resistance for refractories"--Abstract, page 1.
Moore, Robert E., 1930-2003
Wolf, Robert V., 1929-1999
Materials Science and Engineering
M.S. in Ceramic Engineering
United States. Department of the Interior
University of Missouri--Rolla
xii, 132 pages
© 1998 Brad Steven Monton, All rights reserved.
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Monton, Brad Steven, "Compressive creep of magnesium-aluminate spinel synthesized from natural raw materials for refractory applications" (1998). Masters Theses. 1772.
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