Journal of Powder Materials

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Processing Methods for the Preparation of Porous Ceramics: Rizwan Ahmad, Jang-Hoon Ha, In-Hyuck Song; J Korean Powder Metall Inst. 2014;21(5):389-398. Published online October 1, 2014; DOI: https://doi.org/10.4150/KPMI.2014.21.5.389

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Macroporous ceramics with tailored pore size and shape could be used for well-established and emerging applications, such as molten metal filtration, biomaterial, catalysis, thermal insulation, hot gas filtration and diesel particulate filters. In these applications, unique properties of porous materials were required which could be achieved through the incorporation of macro-pores into ceramics. In this article, we reviewed the main processing techniques which can be used for the fabrication of macroporous ceramics with tailored microstructure. Partial sintering, replica templates, sacrificial fugutives, and direct foaming techniques was described here and compared in terms of micro-structures and mechanical properties that could be achieved. The main focus was given to the direct foaming technique which was simple and versatile approach that allowed the fabrication of macro-porous ceramics with tailored features and properties.

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The Effect of Processing Conditions on the Gradient Pore Structure of Diatomite by Centrifugal Molding: Jang-Hoon Ha, Eun-Ji Oh, Rizwan Ahmad, In-Hyuck Song; J Korean Powder Metall Inst. 2012;19(4):304-309.; DOI: https://doi.org/10.4150/KPMI.2012.19.4.304

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The purpose of our study was to develop the fabrication method of porous diatomite ceramics with a porosity gradient by centrifugal molding. The processing variables of centrifugal molding were derived from Stoke's law of sedimentation, which were the radius of the particles, the acceleration due to centrifugal molding and the dynamic viscosity of the slurry. And these could be controlled by ball-milling conditions, centrifugal conditions, and the addition of methyl cellulose, respectively. The effects of processing conditions on the gradient pore structure of diatomite were investigated by particle size analysis, scanning electron microscope, and mercury porosimeter.

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Effect of the processing conditions of reticulated porous alumina on the compressive strength
Chae-Young Lee, Sujin Lee, Jang-Hoon Ha, Jongman Lee, In-Hyuck Song, Kyoung-Seok Moon
Journal of the Korean Ceramic Society.2021; 58(4): 495. CrossRef
Preparation and characterization of alumina-coated silicon carbide supports
Jang-Hoon Ha, Sujin Lee, Syed Zaighum Abbas Bukhari, Jae Ryung Choi, Jongman Lee, In-Hyuck Song, Seung Jun Lee, Jaeho Choi
Ceramics International.2017; 43(12): 9481. CrossRef

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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6 Citations

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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.

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Processing Methods for the Preparation of Porous Ceramics
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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
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Journal of the European Ceramic Society.2014; 34(5): 1303. CrossRef

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