Effects of Powder Carrier on the Morphology and Compressive Strength of Iron Foams: Water vs Camphene
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Effects of Powder Carrier on the Morphology and Compressive Strength of Iron Foams: Water vs Camphene HYEJI PARK, TEAKYUNG UM, KICHEOL HONG, JIN SOO KANG, HO-SEOK NAM, KYUNGJUNG KWON, YUNG-EUN SUNG, and HEEMAN CHOE With its well-known popularity in structural applications, considerable attention has recently been paid to iron (Fe) and its oxides for its promising functional applications such as biodegradable implants, water-splitting electrodes, and the anode of lithium-ion batteries. For these applications, iron and its oxides can be even further utilized in the form of porous structures. In order to control the pore size, shape, and amount, we synthesized Fe foams using suspensions of micrometric Fe2O3 powder reduced to Fe via freeze casting in water or liquid camphene as a solvent through sublimation of either ice or camphene under 5 pct H2/Ar gas and sintering. We then compared them and found that the resulting Fe foam using water as a solvent (p = 71.7 pct) showed aligned lamellar macropores replicating ice dendrite colonies, while Fe foam using camphene as a solvent (p = 68.0 pct) exhibited interconnected equiaxed macropores replicating camphene dendrites. For all directions with respect to the loading axis, the compressive behavior of the water-based Fe foam with a directional elongated wall pore structure was anisotropic (11.6 ± 0.9 MPa vs 7.8 ± 0.8 MPa), whereas that of the camphene-based Fe foam with a random round pore structure was nearly isotropic (12.0 ± 1.1 MPa vs 11.6 ± 0.4 MPa). https://doi.org/10.1007/s11663-018-1302-z The Minerals, Metals & Materials Society and ASM International 2018
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INTRODUCTION
RECENTLY, iron (Fe)-based materials have been extensively investigated for potential use in numerous functional as well as load-bearing structural applications owing to their low cost, abundance in the Earth’s crust, chemical stability (over a wide pH range), and environmental favorability.[1–6] For their functional applications, Fe-based foams have recently been studied for use as catalysts,[1,2] environmental protectors,[3] sensors,[4] lithium-ion batteries,[4,5] and biomaterials[6] because of their unique three-dimensional (3-D) porous architecture, large
HYEJI PARK, TEAKYUNG UM, KICHEOL HONG, HO-SEOK NAM, and HEEMAN CHOE are with the School of Advanced Materials Engineering, Kookmin University, Seoul 02707, Republic of Korea. Contact email: [email protected] JIN SOO KANG and YUNG-EUN SUNG are with the Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea and also with the School of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Republic of Korea. KYUNGJUNG KWON is with the Department of Energy and Mineral Resources Engineering, Sejong University, Seoul 05006, Republic of Korea. Hyeji Park and Teakyung Um have equally contributed to this work. Manuscript submitted December 7, 2017.
METALLURGICAL AND MATERIALS TRANSACTIONS B
surface area, light weight, high toughness, high gas and liquid permeability, and superio
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