Fabrication, properties, and applications of porous metals with directional pores.

Fabrication, properties, and applications of porous metals with directional pores.
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DOI:
10.2183/pjab.86.884
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发表时间:
2010
期刊:
Proceedings of the Japan Academy. Series B, Physical and biological sciences
影响因子:
--
通讯作者:
Nakajima H
Nakajima H
中科院分区:
其他
文献类型:
--
作者:
Nakajima H

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具有排列的长圆柱形孔的莲花型多孔金属是用溶解气体(如氢、氮或氧)从熔体中单向凝固而制成的。气体原子可以通过加压气体气氛或气体化合物的热分解溶解到熔体中。凝固技术有三种:模型铸造、连续区域熔化和连续铸造技术。从大批量生产荷花金属的角度来看,后一种方法具有优势。所观察到的力学性能、吸声和导热性能的各向异性行为是各向异性多孔结构所固有的。特别是,机械强度的显著各向异性归因于垂直于加载方向排列的孔隙周围的应力集中。热沉是荷花金属的一个很有前途的应用,因为它具有高的冷却性能和大的传热。
Lotus-type porous metals with aligned long cylindrical pores are fabricated by unidirectional solidification from the melt with a dissolved gas such as hydrogen, nitrogen, or oxygen. The gas atoms can be dissolved into the melt via a pressurized gas atmosphere or thermal decomposition of gaseous compounds. Three types of solidification techniques have been developed: mold casting, continuous zone melting, and continuous casting techniques. The last method is superior from the viewpoint of mass production of lotus metals. The observed anisotropic behaviors of the mechanical properties, sound absorption, and thermal conductivity are inherent to the anisotropic porous structure. In particular, the remarkable anisotropy in the mechanical strength is attributed to the stress concentration around the pores aligned perpendicular to the loading direction. Heat sinks are a promising application of lotus metals due to the high cooling performance with a large heat transfer.
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