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。本文给出了Gasar工艺中所用气体种类的选择原则，并通过分析Gasar凝固过程，给出了获得指定气孔率且气孔尺寸分布和位置分布都均匀一致的理想藕状多孔结构的气压选择条件，并从以Mg-H系为例的实验结果得到了验证，为实验制备高质量的藕状多孔金属提供了具体的参数指导。
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.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] | |
| [12] | |
| [13] | |
| [14] | |
| [15] | |
| [16] | |
| [17] | |
| [18] | |
| [19] | |
| [20] | |
| [21] | |
| [22] | |
| [23] | |
| [24] | |
| [25] | |
| [26] | |
| [27] |
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