Fabrication of lotus-type porous metals and their physical properties
Fabrication of lotus-type porous metals and their physical properties
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DOI：
10.1002/adem.200405149
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发表时间：
2004-06-01
影响因子：
3.6
通讯作者：
Hyun, SK
中科院分区：
文献类型：
--
作者：
Nakajima, H;Ikeda, T;Hyun, SK
在加压气体气氛中，通过定向凝固制备了长圆柱形孔沿一个方向排列的莲花型多孔金属。当液态金属凝固时，由于过饱和气体的沉淀而形成孔隙。采用模铸法制备的多孔金属具有均匀的孔隙尺寸和孔隙率，但仅限于导热系数高的金属。另一方面，对于具有低热导率的金属和合金，例如不锈钢，形成具有不均匀孔径和孔隙率的孔。为了获得均匀的孔径和孔隙率，开发了一种新的“连续区域熔化技术”，以制备长棒形和板形多孔金属和合金，即使具有低的热导率。介绍了莲花型多孔金属及合金的抗拉、抗压等力学性能，以及内耗、弹性、导热性和吸声性能。所有的物理性质都表现出明显的各向异性。使用加压氮气代替氢气制造的莲花型多孔铁表现出上级的强度。
Lotus-type porous metals whose long cylindrical pores are aligned in one direction were fabricated by unidirectional solidification in a pressurized gas atmosphere. The pores are formed as a results of precipitation of supersaturated gas when liquid metal is solidified. The lotus-type porous metals with homogeneous size and porosity of the evolved pores produced by a mould casting technique are limited to the metals with high thermal conductivity. On the other hand, the pores with inhomogeneous pore size and porosity are evolved for metals and alloys with low thermal conductivity such as stainless steel. In order to obtain uniform pore size and porosity, a new "continuous zone melting technique" was developed to fabricate long rod- and plate-shape porous metals and alloys even with low thermal conductivity. Mechanical properties of tensile and compressive strength of lotus-type porous metals and alloys are described together with internal friction, elasticity, thermal conductivity and sound absorption characteristics. All the physical properties exhibit significant anisotropy. Lotus-type porous iron fabricated using pressurized nitrogen gas instead of hydrogen exhibits superior strength.