SiO_2与Mg-Li合金熔体反应动力学分析

Dynamics of reaction between SiO_2 and Mg-Li melt

基于液淬试样组织观察的结果， 对ＳｉＯ２ 与ＭｇＬｉ 合金熔体反应动力学进行了分析。建立了ＳｉＯ２与ＭｇＬｉ 熔体反应的动力学模型， 提出了控制粒子尺寸及其在熔体分布的措施。得出了ＳｉＯ２ 与ＭｇＬｉ 熔体反应的速度表达式， 确定了Ｍｇ２Ｓｉ 的形成位置。结果表明： ＳｉＯ２ 与ＭｇＬｉ 合金熔体的反应是分两步进行的， 即首先在界面处反应生成ＭｇＯ 与Ｓｉ， 而后Ｓｉ 与Ｍｇ 反应生成Ｍｇ２Ｓｉ。

On the base of microstructure observation of quenching samples, dynamics of the reaction of SiO 2 with Mg Li melt was discussed. The dynamic model of the reaction was established, and the ways for controlling particle size and particle distribution in melt were proposed. The equation of the reaction rate and formed location of Mg 2Si were obtained finally. The results indicate that the reaction is carried out by two steps, MgO and Si is firstly formed at the interface, and then Mg 2Si is formed apart from the interface.