"Reaction chemistry and thermochemistry of magnesia-graphite refractory systems containing antioxidants are presented in the form of five different studies. Thermodynamic data for systems Mg-O, AI-O, Si-O, Mg-AI-O, Mg-Si-O, Mg-O-C, AI-O-C, Si-O-C, Mg-AI-O-C and Mg-Si-O-C are presented in the form of volatility diagrams which provide an efficient way to view systems in which non-condensed phases are of paramount importance, as is the case in magnesia-graphite systems. A review of the current literature on the addition of antioxidants to magnesia-graphite brick is presented. The antioxidants considered include AI-metal, Si-metal, Mg-metal, alloys, Mo-metal, ZrB2, Zr-metal, Ti-metal and SiC. Two mechanisms are presented for the formation of a dense magnesia layer, at the hot face of a refractory lining and both arise from a fairly straightforward thermochemical argument. Thermodynamic calculations based on AI(I) and AI44C3(s) stability provide a reasonable estimate of the prevailing internal oxygen partial pressure gradient. The values presented are much lower than those typically cited in literature. A new technique has been developed which adequately simulates the temperature and partial pressure gradient that linings are subjected to during service. Results for magnesia-graphite-aluminum and magnesium-graphite-silicon brick are presented and related to the wear resistance of these linings"--Abstract, page iv.
Moore, Robert E., 1930-2003
Morris, Arthur E., 1935-
Reidmeyer, Mary R.
Robertson, D. G. C.
Schlesinger, Mark E.
Materials Science and Engineering
Ph. D. in Ceramic Engineering
American Iron and Steel Institute. Refractory Collaborative Group
University of Missouri--Rolla
Journal article titles appearing in thesis/dissertation
- Thermochemistry of Magnesia-Graphite Systems Containing Metallic Aluminum or Silicon Additions
- REVIEW: Role of Additives in Magnesia-Graphite Brick
- Estimation of Prevailing Oxygen Partial Pressure in BOF Refractory Linings
- Effects of a Temperature Gradient on the Location and Stability of Phases in Magnesia-Graphite-Metal Brick
xviii, 175 pages
© 1993 Jeffrey Douglas Smith, All rights reserved.
Dissertation - Restricted Access
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Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://laurel.lso.missouri.edu/record=b2668625~S5
Smith, Jeffrey D., "Reaction chemistry and thermochemistry of magnesia-graphite systems containing antioxidants" (1993). Doctoral Dissertations. 1026.
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