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采用金属-气体共晶定向凝固技术,利用自行研制的Gasar模铸装置,在保温温度为1456 K,氢气压分别为0.04,0.07,0.10 MPa的工艺条件下,成功制备出了直径为Ф100 mm,高度为150 mm的藕状多孔铜试样(气孔率分别为:23.1%,38.5%,48.2%)。在线切割机上将所制备的试样分别沿纵向和不同高度处切开,利用扫描仪和Image J软件对试样照片和气孔率进行采集、统计,研究了低气压下藕状多孔铜气孔和气孔率的分布。结果表明:在低气压(小于0.2 MPa)下,保温温度相同时,随着气压的升高,气孔率升高,气孔孔径也相应地增大,当气压为0.1 MPa时,气孔率增加至48.2%,气孔平均孔径增加至524μm;同一试样,随着试样高度的增加,气孔率呈现先略微增加后减小的趋势,在试样高度约为50 mm处,气孔率达到最大值,这与中高气压下藕状多孔铜气孔和气孔率的分布有所不同,进一步丰富了气压对藕状多孔铜气孔结构影响的理论和实验研究。
The metal-gas eutectic directional solidification technology was used to successfully prepare the gas-phase eutectic steel with a diameter of Ф100 mm under the conditions of a holding temperature of 1456 K and hydrogen pressures of 0.04, 0.07 and 0.10 MPa, respectively. The lotus-shaped porous copper samples with a height of 150 mm (porosity of 23.1%, 38.5%, 48.2% respectively). On-line cutting machine will be prepared samples were cut along the vertical and at different heights, the use of scanner and Image J software on the sample photos and porosity were collected, statistics, research under low pressure lotus-shaped porous copper pores and pores Rate distribution. The results show that with the same holding temperature at low pressure (less than 0.2 MPa), the stomatal ratio increases with the increase of gas pressure and the stomatal aperture increases correspondingly. When the pressure is 0.1 MPa, the porosity increases to 48.2 % And the average pore diameter increased to 524μm. With the increase of sample height, the porosity showed a slight increase at first and then decreased. At the sample height of about 50 mm, the porosity reached its maximum The distribution of porosity and porosity of lotus-shaped porous copper under medium and high pressure is different, which further enriches the theoretical and experimental studies on the effect of pressure on the pore structure of lotus-shaped porous copper.