2004, Volume 6, Issue 6
Strategic Study of CAE >> 2004, Volume 6, Issue 6
Thermodynamic Analysis and Reaction Model of Combustion Synthesis in Al-Cr2O3 System with Al2O3 and Cr2O3 Diluents
Department of Mechanical Engineering, Southeast University, Nanjing 210096, China
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Abstract
The thermodynamic calculation and analysis of combustion synthesis reaction of Al - Cr<sub>2</sub>O<sub>3</sub> system with AI<sub>2</sub>O<sub>3</sub> and Cr<sub>2</sub>O<sub>3</sub> diluents were conducted, and the effects of reaction starting temperature T<sub>O</sub>, diluents AI<sub>2</sub>O<sub>3</sub> and Cr<sub>2</sub>O<sub>3</sub> on the adiabatic combustion temperature T<sub>ad</sub> were also discussed. The near linear relation between T<sub>0</sub> and T<sub>ad</sub> was obtained and its application in directing the composition design was introduced. Furthermore, the correlation between Gibbs free energy AG and reaction temperature T was displayed by above calculation and discussion. It shows the reaction of this system is controlled by diffusion. At last, combined with the analysis on the experiment results, the thermal explosive reaction micro-model was proposed.
Keywords
cermet ; combustion synthesis ; Al - Cr2O3 system ; thermodynamics ; reaction model
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