The Thermodynamics of the Alumina/Aluminum-Oxygen Vapor System

by Firmin Joseph Krieger

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The thermodynamic properties of alumina, A1203, are investigated over a range of temperatures up to 6000 deg K and pressures up to 10 atmospheres. Tabular summaries give computed values of volume, molecular weight, moles of gas, moles of solid or liquid aluminum oxide, density, enthalpy,energy, and entropy for alumina at various temperatures and pressures. A convential Mollier diagram is included in which specific enthalpy is plotted agianst specific entropy, with cross plots of temperature, pressure, and molecular weight in the pure gas region, and cross plots of temperature and moles of condensed A1 0 in th egas-liquid and gas-solid regions. Alumina is the tenth in a series of ablative materials to be studied by means of mathematical techniques similar to those used at RAND in the parametric study of certain low-molecular-weight compounds as rocket propellants. Materials previously studied include graphite, polystyrene, polyethylene, phenol-formaldehyde resin, polyamide resin, teflon, silica, zirconia, and magnesia.

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