(昆明理工大学 材料科学与工程学院，昆明 650093)
摘 要: 利用自行开发研制的Gasar连铸装置，拉制d 15 mm×600 mm的藕状多孔铜连铸试样，并研究氢气压力和试样的下拉速率对藕状多孔铜气孔结构的影响。结果表明：随着氢气压力及下拉速率的增加，连铸试样中气孔尺寸分布逐渐变得均匀；气孔率随氢气压力的增大而减小，而下拉速率对气孔率的影响不大；随下拉速率和氢气压力的增加，气孔的形核率增大，氢气向每个气孔的扩散量减少，导致气孔平均孔径减小及气孔数密度增加。
关键字: 多孔材料；藕状多孔Cu；Gasar连铸工艺；气孔率
（Faculty of Materials Science and Engineering, Kunming University of Science and Technology,
Kunming 650093, China）
Abstract:Lotus-type porous Cu specimens with size of d 15 mm×600 mm were fabricated by self-made continuous casting Gasar process. The effects of hydrogen gas pressure and withdraw rate on the pore structures of lotus-type porous Cu were investigated. The results show that the pore size distribution becomes homogeneous gradually with increasing the hydrogen gas pressure and withdraw rate. The porosity decreases with increasing the hydrogen gas pressure, while it is independent of the withdraw rate. With increasing the hydrogen gas pressure and withdraw rate, the hydrogen content diffused in each pore during solidification decreases with an increase in the pore nucleation rate, which leads to the decrease of the average pore diameter and the increase of the pore number density.
Key words: porous material; lotus-type porous Cu; continuous casting Gasar process; porosity
