B_2O_3与Mg-Li合金反应合成复合材料的热力学及动力学研究

THERMODYNAMICS AND KINETICS OF THE REACTION OF B_2O_3 WITH MgLi ALLOY FOR THE FABRICATION OF MgLi COMPOSITES

通过ＤＴＡ及液淬试验，对Ｂ２Ｏ３与Ｍｇ－Ｌｉ合金反应合成ＭｇＯ颗粒增强Ｍｇ－Ｌｉ基复合材料的热力学及动力学进行了研究。结果表明，Ｂ２Ｏ３与Ｍｇ－Ｌｉ合金的反应温度与Ｍｇ－Ｌｉ合金常规熔炼温度接近，且反应速度很快，适于反应合成复合材料的制备。显微组织观察与ＸＲＤ分析发现，反应生成的ＭｇＯ颗粒尺寸细小，形状圆整且分布均匀。

This paper deals with the thermodynamics and kinetics of the reaction of B_2O_3 with Mg-Li alloy for the production of MgO particulates reinforced Mg-Li composites, which were examined with DTA and water quenching. It can be seen that the reaction of B_2O_3 with Mg-Li alloy could take place at the usual melting temperature of Mg-Li alloys and the reaction rate is quick. Fine, spherical and dispersed MgO particulates were formed by reactive synthesis process, and the presence of MgO was verified by XRD data. The mechanism of reaction is also discussed.