用扫描电镜、X射线衍射仪、金相显微镜等测试手段,研究了采用不同孔径MgO泡沫陶瓷过滤粗Mg前后组织形貌的变化。结果表明,随着泡沫陶瓷过滤孔径的减小,残余的夹杂物更少、更小,而且密度更接近于Mg的理论密度。但经不同孔径泡沫陶瓷过滤的Mg晶粒都比较粗大,而且所得的纯Mg是由α-Mg相组成,没有共晶相。 The morphologies of the samples before and after filtration were studied by scanning electron microscopy, X-ray diffraction and metallographic microscope. The results show that the residual inclusions are smaller and smaller with the decrease of foam ceramic filter pore size, and the density is closer to the theoretical density of Mg. However, the Mg grains filtered by the ceramic foam with different pore sizes are relatively coarse, and the pure Mg obtained is composed of the α-Mg phase and has no eutectic phase.