Gas Pressure Condition for Obtaining Uniform Lotus--Type Porous Structure by Gasar Process
ZHANG Huawei; LI Yanxiang; LIU Yuan
Key Laboratory for Advanced Materials Processing Technology; Ministry of Education; Department of Mechanical Engineering; Tsinghua University; Beijing; 100084
Cite this article:
ZHANG Huawei; LI Yanxiang; LIU Yuan. Gas Pressure Condition for Obtaining Uniform Lotus--Type Porous Structure by Gasar Process. Acta Metall Sin, 2006, 42(11): 1171-1176 .
Abstract 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. The kind of gas which is applicable for Gasar process was discussed in this article. Gas pressure condition 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 mode. As an example, the experimental results of magnesium and hydrogen system verified the above theory.
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