Journal of Powder Materials

[Korean]
The Effect of Fe and Fe₂O₃ Powder Mixing Ratios on the Pore Properties of Fe Foam Fabricated by a Slurry Coating Process: Jin Ho Choi, Eun-Mi Jeong, Dahee Park, Sangsun Yang, Yoo-Dong Hahn, Jung-Yeul Yun; J Korean Powder Metall Inst. 2014;21(4):266-270. Published online August 1, 2014; DOI: https://doi.org/10.4150/KPMI.2014.21.4.266

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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

[Korean]
Research Trend of Ceramic Filter for Water Treatment: In-Hyuck Song, Jang-Hoon Ha, Byungseo Bae, Young-Jo Park, Jae-Woong Ko, Youn-Kyoung Baek, Young-Kuk Kim, Jung-Goo Lee, Yoo-Dong Hahn; J Korean Powder Metall Inst. 2014;21(1):62-71. Published online February 1, 2014; DOI: https://doi.org/10.4150/KPMI.2014.21.1.62

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Reactive ceramic pellets incorporated iron for removing As(III), As(V), and Cr(VI) from aqueous solutions
Sunwon Rha, Yun Sik Gong, Ho Young Jo
Desalination and Water Treatment.2019; 158: 174. CrossRef
Application of Physical and Chemical Enhanced Backwashing to Reduce Membrane Fouling in the Water Treatment Process Using Ceramic Membranes
Seogyeong Park, Joon-Seok Kang, Jeong Jun Lee, Thi-Kim-Quyen Vo, Han-Seung Kim
Membranes.2018; 8(4): 110. CrossRef
Effects of particle size and forming pressure on pore properties of Fe-Cr-Al porous metal by pressureless sintering
Bon-Uk Koo, Yujeong Yi, Minjeong Lee, Byoung-Kee Kim
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

[Korean]
Characterization of the Silica Coated Diatomite Based Ceramic Filter for Water Treatment: Byung-Seo Bae, Jang-Hoon Ha, In-Hyuck Song, Yoo-Dong Hahn; J Korean Powder Metall Inst. 2014;21(1):21-27. Published online February 1, 2014; DOI: https://doi.org/10.4150/KPMI.2014.21.1.21

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Abstract PDF: 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.

[English]
Effect of Process Conditions on the Microstructure of Particle-Stabilized Al₂O₃ Foam: Rizwan Ahmad, Jang-Hoon Ha, Yoo-Dong Hahn, In-Hyuck Song; J Korean Powder Metall Inst. 2012;19(4):278-284.; DOI: https://doi.org/10.4150/KPMI.2012.19.4.278

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Al_2O_3 foam is an important engineering material because of its exceptional high-temperature stability, low thermal conductivity, good wear resistance, and stability in hostile chemical environment. In this work, Al_2O_3 foams were designed to control the microstructure, porosity, and cell size by varying different parameters such as the amount of amphiphile, solid loading, and stirring speed. Particle stabilized direct foaming technique was used and the Al_2O_3 particles were partially hydrophobized upon the adsorption of valeric acid on particles surface. The foam stability was drastically improved when these particles were irreversibly adsorbed at the air/water interface. However, there is still considerable ambiguity with regard to the effect of process parameters on the microstructure of particle-stabilized foam. In this study, the Al_2O_3 foam with open and closed-cell structure, cell size ranging from 20µm to 300µm having single strut wall and porosity from 75% to 93% were successfully fabricated by sintering at 1600°C for 2 h in air.

Citations

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A Fatigue Fracture Study on TDCB Aluminum Foam Specimen of Type Mode III Bonded with Adhesive
J.H. Lee, J.U. Cho
Archives of Metallurgy and Materials.2017; 62(2): 1359. CrossRef
Torsion Property of the Structure Bonded Aluminum Foam Due to Impact
G.W. Hwang, J.U. Cho
Archives of Metallurgy and Materials.2017; 62(2): 1353. CrossRef
Experimental Study On Fracture Property Of Double Cantilever Beam Specimen With Aluminum Foam
Y.C. Kim, H.K. Choi, J.U. Cho
Archives of Metallurgy and Materials.2015; 60(2): 1151. CrossRef
Experimental Study On Fracture Property Of Tapered Double Cantilever Beam Specimen With Aluminum Foam
Y.C. Kim, S.S. Kim, J.U. Cho
Archives of Metallurgy and Materials.2015; 60(2): 1459. CrossRef
Processing Methods for the Preparation of Porous Ceramics
Rizwan Ahmad, Jang-Hoon Ha, In-Hyuck Song
Journal of Korean Powder Metallurgy Institute.2014; 21(5): 389. CrossRef
Effect of valeric acid on the agglomeration of zirconia particles and effects of the sintering temperature on the strut wall thickness of particle-stabilized foam
Rizwan Ahmad, Jang-Hoon Ha, In-Hyuck Song
Journal of the European Ceramic Society.2014; 34(5): 1303. CrossRef

[Korean]
Effect of Pore Formers and Sintering Temperatures on Microstructure and Bending Strength of the Porous Zirconia Ceramics: Eun-Jung Lee, In-Hyuck Song, Jang-Hoon Ha, Yoo-Dong Hahn, Yang-Do Kim; J Korean Powder Metall Inst. 2011;18(6):502-509.; DOI: https://doi.org/10.4150/KPMI.2011.18.6.502

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Abstract PDF: In this study, a novel-processing route for fabricating microcellular zirconia ceramics has been developed. The proposed strategy for making the microcellula zirconia ceramics involved hollow microspheres as pore former. Compared to conventional dense microspheres pore former, well-defined pore structured zirconia ceramics were successfully fabricated. Effects of hollow microsphere content and sintering temperature on microstructure, porosity, pore distribution, and strength were investigated in the processing of microcellular zirconia ceramics.

[Korean]
The Synthesis of Hydrophobic Silica Aerogel in the Macroporous Ceramic Structure by Ambient Drying Process: Sun-Wook Hong, In-Hyuck Song, Young-Jo Park, Hui-Suk Yun, Yoo-Dong Hahn, Ki-Young Hwang, Young-Woo Rhee; J Korean Powder Metall Inst. 2011;18(3):269-276.; DOI: https://doi.org/10.4150/KPMI.2011.18.3.269

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Abstract PDF: The synthesis behavior of nanoporous silica aerogel in the macroporous ceramic structure was observed using TEOS as a source material and glycerol as a dry control chemical additive (DCCA). Silica aerogel in the macroporous ceramic structure was synthesized via sono-gel process using hexamethyldiazane (HMDS) as a modification agent and n-hexane as a main solvent. The wet gel with a modified surface was dried at 105°C under ambient pressure. The addition of glycerol appears to give the wet gel a more homogeneous microstructure. However, glycerol also retarded the rate of surface modification and solvent exchange. Silica aerogel completely filled the macroporous ceramic structure without defect in the condition of surface modification (20% HMDS/nhexane at 36hr).

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