"The deformation of refractory materials consisting of 90% sintered or fused alumina plus 10% silica was measured at temperatures from 1450 to 1515⁰C and a compressive stress of 100 psi. Creep rates and activation energies were determined from the steady state portion of deformation vs. time data and correlated with the mineralogical composition. Supplemental measurements included x-ray diffraction, electron probe microanalysis, apparent porosity and tensile strength. conditions having an important effect upon the mineralolgical composition were: (1) duration of heat treatment, (2) amount of sodium oxide impurity, and (3) reactivity of the alumina grain. Prolonged heat treatment and sodium oxide impurity enhanced mullite formation, thus lowering creep rates. The activation energies ranged from 75 kcal/mole for samples containing sintered alumina doped with 0.5% sodium oxide, to 140-150 kcal/mole for regular sintered or fused alumina. The magnitude of the activation energy was approximately proportional to the mullite content"--Abstract, page [i].
Day, D. E.
Branson, Donald Lee
Moore, Robert E., 1930-2003
Materials Science and Engineering
M.S. in Ceramic Engineering
Aluminum Company of America
University of Missouri at Rolla
x, 80 pages
© 1967 Vernon L. Burdick, All rights reserved.
Thesis - Open Access
Library of Congress Subject Headings
Metals -- Creep
Print OCLC #
Electronic OCLC #
Link to Catalog Record
Burdick, Vernon Lee, "Compressive creep of high alumina refractories" (1967). Masters Theses. 5162.