Ce元素的添加对Mg-1.2Ca合金氧化行为和表面张力的影响

Oxidation behavior and surface tension of Mg-1.2Ca alloy with Ce addition

摘要:

摘 要：为了发展高性能阻燃镁合金，本文对工业纯镁在添加元素Ca和Ce的氧化性能进行了研究。结果表明随着Ce含量从0到1.5wt.%的增加，Mg-1.2Ca合金的燃点不断提高，熔体表面张力不断下降。Mg-1.2Ca-1.2Ce的燃点可以达到780℃，而且可以在大气中不添加任何保护的情况下进行熔炼。随着Ce含量的增加Mg-1.2Ca熔体氧化膜变得光滑而致密，可以很好地起到阻止氧化、燃烧的效果。通过检测和分析，Mg-1.2Ca-1.2Ce的氧化膜可以分成三层：外层是疏松的MgO，中间层是MgO-CaO复合氧化膜，内层是MgO-Ce2O3复合氧化膜。

Abstract:

Abstract: The effect of alloying element Ce on oxidation behavior and surface tension of Mg-1.2Ca alloy was investigated in order to have a further develop for the ignition-proof magnesium alloys. As the content of Ce range from 0 to 1.5wt.%, the ignition point of Mg-1.2Ca increase rapidly while the surface tension decline. The ignition point of Mg-1.2Ca-1.2Ce alloy can reach to 780℃. And the Mg-1.2Ca-1.2Ce alloy can be melt at the atmosphere without any protection method. The oxidation film of Mg-1.2Ca melt has turned to fine and close structure from porous structure with Ce addition, which can prevent magnesium alloys from further oxidation and burning. According to the test and analysis, oxide film of Mg-1.2Ca-1.2Ce alloy consists of three layers which are loose MgO in the outer layer, MgO-CaO composite oxide film in the middle layer and MgO-Ce2O3 composite oxide film in the inner layer respectively.