Gas Pressure Condition for Obtaining Uniform Lotus--Type Porous Structure by Gasar Process

Acta Metall Sin

2006, Vol. 42

Issue (11): 1171-1176 DOI:

Research Articles

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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

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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 .

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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.

Key words: Gasar unidirectional solidification porous metal lotus-type structure eutectic

Received: 28 March 2006

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