Reaction kinetics and a physical model of the charring layer by depositing Al2 O3 at ultra-high temperatures

Physical Chemistry Chemical Physics : PCCP
Yi-Wen GuanQi-Long Yan

Abstract

The thermochemical ablation of insulation material caused by slag deposition in solid rocket motors has increasingly attracted researchers' attention. Understanding the ablation mechanism and the ability to calculate reaction kinetics parameters determine the height of the thermal protection design for advanced solid rocket motors. In this work, the interaction of the Al2O3-C system is determined through static ablation experiments. Using X-ray diffraction, HSC thermodynamic software, and a thermogravimetric analyser, the carbon thermal reduction of alumina is analysed and the reaction mechanism and physical model are obtained. Isothermal experiments at 1700-1850 °C and mathematical analysis provide the kinetic parameters of the overall and step-by-step reactions. The results show that the overall reaction of the Al2O3-C system involves three steps. The overall reaction kinetics are described by the contracting area model R2 with apparent activation and frequency factors estimated as 254.5 kJ mol-1 and 5.5 × 106 min-1, respectively. The distribution reaction kinetics of steps 1 and 2 are described by the first-order chemical reaction control model (F1) and that of step 3 is described by the one-dimensional diffusion control mod...Continue Reading

References

Jul 20, 2007·Physical Chemistry Chemical Physics : PCCP·Jarod WilsonFrancisco Zaera
Oct 5, 2007·Physical Chemistry Chemical Physics : PCCP·Nathanael GuigoNicolas Sbirrazzuoli
Feb 10, 2011·The Journal of Physical Chemistry. B·Antonio PerejónLuis A Pérez-Maqueda
Mar 22, 2014·Physical Chemistry Chemical Physics : PCCP·Young Joon ChoiKriston Brooks

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Methods Mentioned

BETA
X-ray
scanning electron microscopy

Software Mentioned

HSC
PeakFit

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