- Effect of Process Conditions on the Microstructure of Particle-Stabilized Al2O3 Foam
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Rizwan Ahmad, Jang-Hoon Ha, Yoo-Dong Hahn, In-Hyuck Song
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J Korean Powder Metall Inst. 2012;19(4):278-284.
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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.
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Citations
Citations to this article as recorded by  - 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
- Effect of Pore Formers and Sintering Temperatures on Microstructure and Bending Strength of the Porous Zirconia Ceramics
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Eun-Jung Lee, In-Hyuck Song, Jang-Hoon Ha, Yoo-Dong Hahn, Yang-Do Kim
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J Korean Powder Metall Inst. 2011;18(6):502-509.
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DOI: https://doi.org/10.4150/KPMI.2011.18.6.502
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- 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.
- The Synthesis of Hydrophobic Silica Aerogel in the Macroporous Ceramic Structure by Ambient Drying Process
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Sun-Wook Hong, In-Hyuck Song, Young-Jo Park, Hui-Suk Yun, Yoo-Dong Hahn, Ki-Young Hwang, Young-Woo Rhee
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J Korean Powder Metall Inst. 2011;18(3):269-276.
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DOI: https://doi.org/10.4150/KPMI.2011.18.3.269
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Abstract
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- 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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