熔炼镁及镁合金用坩埚材料化学稳定性的热力学分析

Thermodynamic Analysis for the Chemical Stability of Crucible Materials for Melting Magnesium and Its Alloy

摘要:

通过建立热力学可能的反应模犁，分别计算了高温下镁及镁合金与一些金属氧化物和非氧化物反应的自由能变化，并用自由能判据分析了这些反应发牛的可能性。结果表明，非氧化物SiC和ZrB2对镁及镁合金液具有良好的化学稳定性，可以作为熔炼镁及镁合金的坩埚材料使用，并用实验对这种材料在镁及镁合金液中的化学稳定性进行了验证。

Abstract:

The Gibbs free energy changes of the reactions of magnesium and its alloy with some materials were calculated at high temperature. The possibilities of the reactions were analyzed by free energy criterion .The results show that SiC and ZrB2 have good stability to liquid magnesium and its alloy and they are the good materials of crucible used for magnesium and its alloy melting. The stability of SiC in the liquid magnesium and its alloy was tested by experiment.