"The effect of oxygen activity on the sintering of Cr₂O₃ with minor additions of MgO, and of MgO with minor additions of Cr₂O₃ at 1600ºC was investigated. A peak density (99.4% of theoretical) was obtained for high purity Cr₂O₃ by maintaining the equilibrium oxygen partial pressure needed to maintain the Cr₂O₃ phase. The addition of 0.1 wt. % MgO increased the sintered density at the same oxygen pressure to 99.8%. Further MgO additions decreased the density. The density of pure MgO was independent of the PO₂ over the range investigated. Addition of Cr₂O₃ to MgO decreased the density at all oxygen pressures investigated. The largest decreases corresponded to the pressure ranges where the most volatile species in the Cr-O system appear. The weight loss was also monitored as a function of oxygen activity for all specimens. It was found to correlate with the changing predominant volatile species in the chrome-oxygen system. An anomalous weight loss of MgO was found at PO₂≤ 10⁻¹² atm which may be due to a volatile Mg-Cr oxide species"--Abstract, page ii.
Ownby, P. D.
Frad, William A., 1909-1974
Moore, Robert E., 1930-2003
Materials Science and Engineering
M.S. in Ceramic Engineering
American Iron and Steel Institute
University of Missouri--Rolla
92 pages in various pagings
© 1971 Gordon Eric Jungquist, All rights reserved.
Thesis - Open Access
Ceramic materials -- Mechanical properties
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Jungquist, Gordon E., "Final sintering of Cr₂O₃ with minor additions of MgO and sintering of MgO with minor additions of Cr₂O₃" (1971). Masters Theses. 5085.