(1.哈尔滨工业大学 材料科学与工程学院,哈尔滨 150001;
2.吉林工业大学 材料科学与工程学院, 长春 130025)
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, Ce2O3和Al2O3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。
关键字: 镁合金; 富Ce稀土; 起燃温度
ignition temperature of magnesium alloy
(1. Harbin Institute of Technology, Harbin 150001, P.R.China;
2. Jilin University of Technology, Changchun 130025, P.R.China)
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 reactwith 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, Ce2O3, Al2O3 and Mg17Al12, which has excellent ignition-proof effect. Therefore the study should be beneficial to the application of magnesium alloy.
Key words: magnesium alloy; Ce rare-earth; ignition temperature