(1. 東南大學(xué) 材料科學(xué)與工程系， 南京 210096；
2. 南京理工大學(xué) 材料科學(xué)與工程系，南京 210094)
摘 要: 從熱力學(xué)的角度討論了原位反應(yīng)生成Al2O3和TiB2陶瓷粒子增強(qiáng)鋁基復(fù)合材料的合成機(jī)理。結(jié)果表明，在Al-TiO2-B體系中，以一定的加熱速率加熱至1 073 K左右時(shí)，Al與TiO2之間首先發(fā)生鋁熱反應(yīng)，反應(yīng)產(chǎn)生出活性鈦原子并形成Al-Ti-B反應(yīng)系；AlB2和Al3Ti均系反應(yīng)中間產(chǎn)物 AlB2在1 200 K左右時(shí)分解為Al和B，Al3Ti被B還原，當(dāng)B的加入量(摩爾)是TiO2的兩倍左右時(shí)，Al3Ti基本消失，最終生成Al2O3和TiB2陶瓷顆粒增強(qiáng)的鋁基復(fù)合材料。
關(guān)鍵字: 原位反應(yīng)； 陶瓷粒子； 熱力學(xué)
fabricated by exothermic dispersion method
（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, Nanjing 210094，P.R.China）
Abstract:The thermodynamics of insitu reaction from the reaction system of Al-TiO2-B to form Al2O3, TiB2/Al composites was studied. The results show that under the condition of certain heating rate, aluminum reacts with TiO2 firstly at 1 073 K and then forms Al-Ti-B reaction system. The phases of AlB2 and Al3Ti occur during the reaction process as medi-products and the AlB2 phase is decomposed into Al and B at the temperature of about 1 200 K, meanwhile, Al3Ti is deduced by B to form TiB2. When the mole ratio of B/TiO2 is about two, the Al3Ti phase is almost eliminated completely.
Key words: in-situ reaction; ceramic particles; thermodynamics
