Gas Pressure Condition for Obtaining Uniform Lotus--Type Porous Structure by Gasar Process
Gasar工艺获得均匀藕状多孔结构的气压选择

Gas pressure is the effective and most easily controlled parameter for fabricating lotus-type porous metals with long cylindrical regular ordered pores by unidirectional solidification of metal-gas eutectic. On the basic of discussing the kind of gas which is applicable for Gasar process, the condition of gas pressure for obtaining uniform lotus-type porous structure, in which the spatial distribution and the size of pores both are highly uniform, has been established through analyzing the influence of gas pressure on the position of eutectic point and solidification mode (eutectic, hypereutectic and hypoeutectic mode), and comparing the homogeneity of lotus-type porous structures obtained under three solidification modes. As an example, the experiment of Mg-H system was carried out, which verified the established condition to be reasonable.