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XD合成Al₂O₃,TiB₂/Al复合材料的热力学分析

Thermodynamics analysis of Al₂O₃, TiB₂/Al composites fabricated by exothermic dispersion method

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【Author】 ZHU He guo 1,2 , WU Shen qing 1, WANG Hen zhi 2 (1. Department of Materials Science and Engineering, Southeast University, Nanjing 210096, P.R.China; 2. Department of Materials Science and Engineering, Nanjing University of Technology, Nanj

【机构】东南大学材料科学与工程系!南京210096南京理工大学材料科学与工程系；南京210094；东南大学材料科学与工程系!南京210096；南京理工大学材料科学与工程系!南京210094；

【摘要】从热力学的角度讨论了原位反应生成Al2 O3 和TiB2 陶瓷粒子增强铝基复合材料的合成机理。结果表明 ,在Al TiO2 B体系中 ,以一定的加热速率加热至 10 73K左右时 ,Al与TiO2 之间首先发生铝热反应 ,反应产生出活性钛原子并形成Al Ti B反应系 ;AlB2 和Al3 Ti均系反应中间产物 ,AlB2 在 12 0 0K左右时分解为Al和B ,Al3 Ti被B还原 ,当B的加入量 (摩尔 )是TiO2 的两倍左右时 ,Al3 Ti基本消失 ,最终生成Al2 O3 和TiB2 陶瓷颗粒增强的铝基复合材料。更多还原

【Abstract】 The thermodynamics of in situ reaction from the reaction system of Al TiO 2 B to form Al 2O 3, TiB 2/Al composites was studied. The results show that under the condition of certain heating rate, aluminum reacts with TiO 2 firstly at 1?073?K and then forms Al Ti B reaction system. The phases of AlB 2 and Al 3Ti occur during the reaction process as medi products and the AlB 2 phase is decomposed into Al and B at the temperature of about 1?200?K, meanwhile, Al 3Ti is deduced by B to form TiB 2. When the mole ratio of B/TiO 2 is about two, the Al 3Ti phase is almost eliminated completely. [更多还原