Masters Theses

Abstract

"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.

Advisor(s)

Ownby, P. D.

Committee Member(s)

Frad, William A., 1909-1974
Moore, Robert E., 1930-2003

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Ceramic Engineering

Sponsor(s)

American Iron and Steel Institute

Publisher

University of Missouri--Rolla

Publication Date

1971

Pagination

92 pages in various pagings

Rights

© 1971 Gordon Eric Jungquist, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Ceramic materials -- Mechanical properties
Sintering
Magnesium oxide
Chromium

Thesis Number

T 2639

Print OCLC #

6039036

Electronic OCLC #

878051994

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