Metal foams have a cellular structure consisting of a solid metal containing a large volume fraction of pores. In particular, open, penetrating pores are necessary for industrial applications such as in high temperature filters and as a support for catalysts. In this study, Fe foam with above 90% porosity and 2 millimeter pore size was successfully fabricated by a slurry coating process and the pore properties were characterized. The Fe and Fe₂O₃ powder mixing ratios were controlled to produce Fe foams with different pore size and porosity. First, the slurry was prepared by uniform mixing with powders, distilled water and polyvinyl alcohol(PVA). After slurry coating on the polyurethane( PU) foam, the sample was dried at 80°C. The PVA and PU foams were then removed by heating at 700°C for 3 hours. The debinded samples were subsequently sintered at 1250°C with a holding time of 3 hours under hydrogen atmosphere. The three dimensional geometries of the obtained Fe foams with an open cell structure were investigated using X-ray micro CT(computed tomography) as well as the pore morphology, size and phase. The coated amount of slurry on the PU foam were increased with Fe₂O₃ mixing powder ratio but the shrinkage and porosity of Fe foams were decreased with Fe₂O₃ mixing powder ratio.

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• Fabrication and Mechanical Properties of STS316L Porous Metal for Vacuum Injection Mold
  Se Hoon Kim, Sang Min Kim, Sang Ho Noh, Jin Pyeong Kim, Jae Hyuck Shin, Si-Young Sung, Jin Kwang Jin, Taean Kim
  Journal of Korean Powder Metallurgy Institute.2015; 22(3): 197.     CrossRef

In this study, diatomite based materials were investigated as a support filter for silica particle coating. The silica sol for coating was synthesized by a stöber process. The diatomite support was dry-pressed at 10 MPa and sintered at 1200°C for 1 hour. The coating sol was prepared as a mixture of EtOH and silica sol. The diatomite support was coated by a dip-coating process. Silica coated diatomite filter was sintered at 1000~1200°C for 1 hour. The largest pore size was decreased with increasing concentration ratio of coating sol. The gas and water permeability of silica coated diatomite decreased with increasing of concentration ratio of the coating sol.

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  Seogyeong Park, Joon-Seok Kang, Jeong Lee, Thi-Kim-Quyen Vo, Han-Seung Kim
  Membranes.2018; 8(4): 110.     CrossRef
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  Metals and Materials International.2017; 23(2): 336.     CrossRef
• Characterization and Microstructure of an Extruded Flat-Tubular-Type Alumina Filter
  Byung-Seo Bae, Jang-Hoon Ha, In-Hyuck Song
  Journal of the Korean Ceramic Society.2014; 51(5): 406.     CrossRef