Effect of transference velocity and hydrogen pressure on porosity and pore morphology of lotus-type porous copper fabricated by a continuous casting technique

Park, J.S.; Hyun, Soong‐Keun; Suzuki, Shinsuke; Nakajima, Hideo

doi:10.1016/j.actamat.2007.06.022

Cited by 113 publications

(95 citation statements)

References 23 publications

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“…Fig. 14-Dependence of porosity of aluminum and copper [25] on the solidification velocity. Experimental results and the results calculated using Eq.…”

Section: Discussionmentioning

confidence: 99%

“…Park et al have investigated the effect of the solidification velocity on the porosity and pore size in lotus copper fabricated by a continuous casting technique. [25] They found that the pore size decreases as the solidification velocity increases, but the porosity is nearly independent of the solidification velocity. Park et al have suggested that when the solidification velocity increases, the number of pore nucleation sites increases due to an increase in the degree of supercooling, and consequently, the average pore diameter decreases.…”

Section: B Effect Of Solidification Velocity On Porosity and Pore Sizementioning

confidence: 99%

“…Park et al have suggested that when the solidification velocity increases, the number of pore nucleation sites increases due to an increase in the degree of supercooling, and consequently, the average pore diameter decreases. [25] Similarly, the decrease in pore size in lotus aluminum can be also explained by supercooling.…”

Section: B Effect Of Solidification Velocity On Porosity and Pore Sizementioning

confidence: 99%

“…[11] for the solidification velocity dependences of porosities of lotus aluminum and copper. [25] Because the dependence of porosity on the temperature gradient during unidirectional solidification for lotus copper was not reported, we calculated the porosity assuming temperature gradients of 10, 30, and 50 K/mm. The calculated porosities for lotus copper based on the present model are consistent with the tendencies observed in the experimental results.…”

Section: D Sinðpfþ ½4mentioning

confidence: 99%

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Fabrication of Porous Aluminum with Directional Pores through Continuous Casting Technique

Ide

Iio

Nakajima

2012

Metall Mater Trans A

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Lotus-type porous aluminum with slender directional pores is fabricated via a continuous casting technique in pressurized hydrogen or a mixed gas containing hydrogen and argon. The influence of solidification conditions such as hydrogen partial pressure, solidification velocity, temperature gradient, and melt temperature on the porosity and pore size is investigated. The porosity and pore size increase upon increasing the hydrogen partial pressure or the melt temperature, whereas the porosity and pore size decrease upon increasing the solidification velocity or the temperature gradient. Furthermore, the mechanism of pore formation in lotus aluminum is examined based on the results of an improved model of hydrogen mass balance in the solidification front, which was originally proposed by Yamamura et al. The results from the present model agree with the experimental results. We conclude that the diffusion of hydrogen rejected in the solidified aluminum near the solid/liquid interface is the most important factor for pore formation because the difference in hydrogen solubility between solid and liquid aluminum is very small.

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“…Fig. 14-Dependence of porosity of aluminum and copper [25] on the solidification velocity. Experimental results and the results calculated using Eq.…”

Section: Discussionmentioning

confidence: 99%

Section: B Effect Of Solidification Velocity On Porosity and Pore Sizementioning

confidence: 99%

Section: B Effect Of Solidification Velocity On Porosity and Pore Sizementioning

confidence: 99%

Section: D Sinðpfþ ½4mentioning

confidence: 99%

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Fabrication of Porous Aluminum with Directional Pores through Continuous Casting Technique

Ide

Iio

Nakajima

2012

Metall Mater Trans A

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“…When the melt dissolving hydrogen is solidified, inso- [5], and continuous casting technique [6]. Among them, the most superior technique is the continuous casting technique, which is shown in Figure 1.…”

Section: Fabrication Of Lotus Metalsmentioning

confidence: 99%

Mechanical, Thermal and Electrical Properties of Lotus-Type Porous Metals

Nakajima¹

2018

MSA

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Lotus-type porous metals are fabricated by directional solidification of molten metals dissolving hydrogen. Unidirectional pores cause various anisotropic features of mechanical, thermal and electrical properties. Tensile, compressive and fatigue strength parallel to the pore direction are higher than those perpendicular to the pore direction. Besides, thermal and electrical conductivities parallel to the pore direction are higher than those perpendicular to the pore direction. Such anisotropy is attributed to the difference in the pinning cross-sectional area due to the dislocations and the scattering cross-sectional area due to electrons. The pore cross-sectional area perpendicular to the pore direction is much larger than that parallel to the pore direction. It is surmised that such difference in pore cross-section results in the anisotropy in mechanical, thermal and electrical properties.

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Fabrication of Lotus‐Type Porous Copper by Centrifugal Casting Technique

Lee

Kim

et al. 2012

Supplemental Proceedings

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Effect of transference velocity and hydrogen pressure on porosity and pore morphology of lotus-type porous copper fabricated by a continuous casting technique

Cited by 113 publications

References 23 publications

Fabrication of Porous Aluminum with Directional Pores through Continuous Casting Technique

Fabrication of Porous Aluminum with Directional Pores through Continuous Casting Technique

Mechanical, Thermal and Electrical Properties of Lotus-Type Porous Metals

Fabrication of Lotus‐Type Porous Copper by Centrifugal Casting Technique

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