【摘要】 镁合金在压铸过程中容易发生氧化燃烧 ,在目前的阻燃方法中 ,以添加合金元素法的效果最明显。作者通过对添加富铈稀土的研究 ,认为富铈稀土的添加同样对镁合金的阻燃具有显著作用 ,例如添加 1%的富铈稀土 ,起燃温度提高约 170℃ ,可直接暴露在大气中熔炼镁合金。扫描电镜和X射线衍射分析表明 ,稀土的分布由试样的内部向表面逐渐增多 ,镁合金表面膜基体金属中原来的MgO疏松结构转变为由MgO ,Ce2 O3和Al2 O3及Mg17Al12 组成的复合致密结构 ,具有很好的防燃效果。由此结论为 :具有丰富镁、稀土资源的中国 ,应将镁合金防燃研究的重点放在添加稀土、防止镁合金氧化燃烧这方面 ,以促进镁合金在我国的广泛应用更多还原

【Abstract】 It has been testified by experiment that by the addition of Ce, the ignition temperature of magnesium alloy was raised by 170?℃. The results of SEM analysis indicate that the content of Ce is raised from inside to outside. In magnesium alloy, rare earth is prone to react with MgO. The results of XRD indicate that oxide film on the surface of ignition proof magnesium alloy can change from loose structure of simple MgO to compact composite structure consisting of MgO, Ce 2O 3, Al 2O 3 and Mg 17 Al 12 , which has excellent ignition proof effect. Therefore the study should be beneficial to the application of magnesium alloy.更多还原