Gasar工艺下藕状多孔银的气孔结构研究

Pore morphology of lotus-type porous silver fabricated by Gasar process in oxygen atmosphere

摘要:

金属-气体共晶定向凝固（Gasar)是制备藕状多孔金属的新工艺，利用自行研制的Gasar装置，成功地制备了不同纯氧分压下的藕状多孔银试样，研究了氧气分压对藕状多孔银气孔形貌（气孔率、气孔尺寸和分布、气泡形核）的影响。结果表明：氧气分压对气孔形貌影响十分显著。随着氧气压力的增加，气孔率增大而平均气孔直径减小。

Abstract:

Directional solidification of metal/gas eutectic (Gasar) is a novel process for fabricating porous metals with oriented pores parallel to the solidification direction. By use of the developed Gasar apparatus, lotus-type porous silver samples with different porosities have been fabricated in oxygen atmosphere. In this paper, we studied the effects of gas pressure on porosity, pore nucleation, pore size and distribution. It is concluded that the porosity and the pore size in the lotus-type porous silver were significantly affected by pressures of oxygen. The porosity increases with increasing pressure of oxygen. The average pore diameter decreases with increasing of oxygen pressure.