Thermochemical Evaluation of Combustion Synthesis of Al_2O_3/B_4C Composite

• 出 处: Journal of University of Science and Technology Beijing(Engl
• 发表日期: 1998年02期
• 关键词: adiabatic desired starting introducing combustion adding boron maintain melting

The equilibrium phase and adiabatic temperature for combustion synthesis of Al_2O_3/B_4C employing Al, B_2O_3 and C as starting materials is analyzed by both conventional and CALPHAD method. The adiabatic temperature calculed by CALPHAD method is significantly lower than that obtained by conventional method. The CALPHAD calculation also reveals that the equilibrium phases presented at the adiabatic temperature are different to the desired composites. The adiabatic temperature in this system can be lowered by introducing Al_2O_3 as diluents. The maximum amount of Al_2O_3 that can be added to the system while maintain a self-sustaining combusion mode is 1.3 mol.

The equilibrium phase and adiabatic temperature for combustion synthesis of Al 2 O 3 / B_4C employing Al, B 2 O 3 and C as starting materials is analyzed by both conventional and CALPHAD method. The adiabatic temperature calculed by CALPHAD method is significantly lower than that obtained by conventional method. The CALPHAD The adiabatic temperature in this system can be lowered by introducing Al_2O_3 as diluents. The maximum amount of Al_2O_3 that can be added to the system while maintaining a self -sustaining combusion mode is 1.3 mol.