Thermodynamic Study Of B2o3(1) Reactivity In H2o(G),/N2(G)O2(G) Atmospheres At High Pressure And High Temperature
HIGH TEMPERATURE CERAMIC MATRIX COMPOSITES 5(2005)
Abstract
Thermodynamic calculations allowed to investigate and discuss the theoretical influences of the temperature (600 to 1400 degrees C) and the total pressure (0.1 to 3 MPa) on the volatilization process of 131030) in a H2O/N-2/O-2 (10/72/18) gas mixture. From the thermodynamic calculations of equilibrium partial pressures of the volatilization products, a simple model allowing to calculate the theoretical linear volatilization rate constants of B2O3(1) was established. The theoretical values are in reasonable good agreement with the experimental linear volatilization rate constants determined at atmospheric pressure, for temperatures ranging from 600 to 1200 degrees C and under a H2O/N-2/O-2 (10/70/20) gas mixture flowing at 0.2 cm.s(-1).
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