金属-气体共晶定向凝固(Gasar)是一种制备藕状多孔金属的新工艺，在高压纯氧气氛中，利用自行研制的Gasar模铸装置制备了藕状多孔Ag试样，并研究了氧气压力对气孔率、平均气孔直径的影响。结果表明：在多孔Ag中，氧气压力对气孔率和平均气孔直径的影响十分显著。随着氧气压力的增加，气孔率增大，而平均气孔直径减少，当氧气压力为0.5 MPa时，气孔分布最为均匀。
Directional solidification of metal/gas eutectic (Gasar) is a novel process for fabricating porous metals with pores parallel to the solidification direction. By use of the developed ‘Gasar’ apparatus, lotus-type porous silver samples have been fabricated in pressurized oxygen. At the same time, the effects of gas pressure on porosity, pore nucleation, pore size and distribution were studied. The results show that oxygen pressure has great influence on pore morphology. The porosity increases with increasing pressure of oxygen. The average pore diameter decreases with increasing of oxygen pressure.
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