Gas Pressure Condition for Obtaining Uniform Lotus--Type Porous Structure by Gasar Process
Gas Pressure Condition for Obtaining Uniform Lotus--Type Porous Structure by Gasar Process
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DOI：
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发表时间：
2006-11
影响因子：
2.3
通讯作者：
Zhang Huawei;Li Yanxiang;Liu Yuan
中科院分区：
文献类型：
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作者：
Zhang Huawei;Li Yanxiang;Liu Yuan
在用金属-气体共晶定向凝固(Gasar)制备藕状规则多孔金属的工艺中，气体压力是对多孔结构影响最大且最方便调控的工艺参数。在讨论了适用于Gasar工艺的气体种类的基础上，通过分析气体压力对共晶点位置和凝固方式的影响，建立了获得孔隙空间分布和尺寸高度均匀的莲花状多孔组织的气体压力条件（共晶、过共晶和亚共晶）3种凝固模式下，比较了3种凝固模式下获得的莲花状多孔组织的均匀性。以Mg-H体系为例进行了实验，验证了所建立条件的合理性。
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.