Effect of transference velocity and hydrogen pressure on porosity and pore morphology of lotus-type porous copper fabricated by a continuous casting technique
Effect of transference velocity and hydrogen pressure on porosity and pore morphology of lotus-type porous copper fabricated by a continuous casting technique
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DOI：
10.1016/j.actamat.2007.06.022
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发表时间：
2007-09
期刊：
影响因子：
9.4
通讯作者：
J. Park;S. Hyun;Shinsuke Suzuki;H. Nakajima
中科院分区：
文献类型：
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作者：
J. Park;S. Hyun;Shinsuke Suzuki;H. Nakajima
采用连续铸造技术，在加压氢气气氛中制备了具有平行于凝固方向的长圆柱形孔的莲花型多孔铜。溶解氢的熔融铜被向下拉，以给定的传递速度通过冷却的模具凝固。这种技术的优点是可以生产长700毫米的荷花型多孔金属板。研究了氢气压力和传递速度对孔隙度和孔隙形态的影响。孔隙度与传递速度无关，但与氢气压力有关。平均孔径和孔长均受传递速度和氢气压力的影响。传递速度的变化影响了板坯表面附近孔隙的形成位置。孔隙度和孔径受传递速度和氢气压力的控制。结果表明，连铸技术是一种很有前途的大规模生产莲花型多孔金属的方法。
A continuous casting technique was developed to fabricate, in a pressurized hydrogen atmosphere, lotus-type porous copper with long cylindrical pores aligned parallel to the solidification direction. The molten copper dissolving the hydrogen was pulled downward to be solidified through a cooled mould at a given transference velocity. This technique has the benefit of producing long-sized lotus-type porous metal slabs as long as 700mm. The effects of the hydrogen gas pressure and the transference velocity on the porosity and the pore morphology were investigated. The porosity was independent of the transference velocity but dependent on the hydrogen gas pressure. The average pore diameter and pore length were affected by the changes of both the transference velocity and hydrogen gas pressure. The change of transference velocity affected the pore formation position near the slab surface. The porosity and pore size were therefore well controlled by the transference velocity and hydrogen gas pressure. It is concluded that the continuous casting technique is a promising method for the mass production of lotus-type porous metals.