Papers by Author: Y. Kim

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Authors: Woo Teck Kwon, Soo Ryong Kim, Y. Kim, Yoon Joo Lee, Eun Jin Jung, Won Kyu Park, Sea Cheon Oh
Abstract: β-SiC powder was synthesized directly from silicon sludge with carbon black. Large amount of silicon sludge is generated from Solar Cell industry. In an environmental and economic point of view, recycling silicon sludge is important. In this study, two kinds of silicon sludge were characterized using XRD, SEM/EDS and FT-IR. SiC powder was synthesized by the reaction of ball-milled silicon powder for 3h in vacuum at different temperatures (1350 and 1600). Physical properties of the heat treated SiC have been characterized using a SEM, XRD, Particle size analyzer and FT-IR Spectroscopy.
Authors: Soo Ryong Kim, J.H. Lee, Yung Tae Kim, S.J. Jung, Y.J. Lee, Hee Song, Y. Kim
Authors: Soo Ryong Kim, Y. Kim, W.T. Kwon, H.S. Kim, Y.M. Choi, Hae Jung Kim, S.M. Ha
Abstract: A porous silicon-containing hydroxyapatite has been prepared using natural coral as a calcium source to obtain a biomaterial having an improved biocompatibility. From the XRD analysis, it was confirmed that the single-phase hydroxyapatite containing silicon has formed without revealing the presence of extra phases related to silicon dioxide or other calcium phosphate species. Silicon content is ranged from 0.5wt% to 1wt% by weight. The porous silicon-containing hydroxyapatite blocks were inserted into the 5mm diameter of drill holes made through the lateral femoral condyles of New Zealand white rabbits. The new bony formation did not begin after 1 week. At 3 week, bony ongrowth to the inserted porous silicon-containing hydroxyapatite block could be found, and the new bone surrounded the inserted block entirely after 24weeks. Based on in-vivo test, Si-containing porous hydroxyapatite derived from coral possesses high biodegradability and can be considered a useful material for bone implants.
Authors: Jong Heon Lee, Kang Sik Lee, Jae Suk Chang, Woo Shin Cho, Y. Kim, Soo Ryong Kim, Yung Tae Kim
Authors: Kyung Mok Nam, Yoon Joo Lee, Soo Ryong Kim, Woo Teck Kwon, Hyung Sun Kim, Y. Kim
Abstract: The formation of organic-inorganic hybrid composite with ceramic platelets and polymeric compound can have the higher strength and higher elasticity than metal, which is a nanocomposite with high strength and light weight. Ceramic platelet such as Al2O3 has been used to form organic-inorganic composite material using PMMA as an organic polymer. Bending strength and density of the composites prepared by infiltration and post-warm pressing were measured. FE-SEM and TG analysis were carried out to determine the microstructure of the organic-inorganic composite materials. Bending strengths and densities of the composites prepared by Al2O3 ceramic plate and PMMA after post-warm pressing were ~70MPa and ranged from 2.4 to 2.6, respectively.
Authors: Woo Teck Kwon, Soo Ryong Kim, Y. Kim, Jong Hee Hwang, Vikram V. Dabhade, Tae Wook Yoo, Seong Youl Bae
Abstract: The possible utilization of automobile shredder residue as a fuel in the cement kiln process was investigated. The detailed characteristics of the automobile shredder residues were investigated in terms of it’s chlorine content as a fuel feed and its circulation in cement kiln. For estimation of the chlorine content in the cement kiln system, the Weber model which is one of the circulation material’s forecast model was used. From the results, we estimated the chlorine by-pass rate should be 1 ~ 2 percent, for maintaining the present level of chlorine content’s on the hot-meal of the cement kiln system.
Authors: Woo Teck Kwon, Y. Kim, Soo Ryong Kim, Tae Yeoung Lim
Authors: Woo Teck Kwon, Byung Ik Kim, Y. Kim, Soo Ryong Kim, Sang Wook Ha
Abstract: In this work, the physical & chemical properties of bottom ash generated from power plant are analyzed. Characteristic mortar property and thermal conductivity for building material were investigated with content of added bottom ash. According to the analytic result of bottom ash, chemical compositions of bottom ash is similar to those of fly ash and compressive strength after 7days related to pozzolanic activity shows 2.5N/cm2 and it is confirmed that bottom ash possess a certain amount of moisture activity. Although the fluidity of cement mortar is rapidly decreased with increasing addition of bottom ash, compressive strength for 3 and 7days is increased. The thermal conductivity is not sensitive to the addition of bottom ash.
Authors: Woo Teck Kwon, Soo Ryong Kim, Y. Kim, Yoon Joo Lee, Ji Yeon Won, Tae Gyung Ko, Sea Cheon Oh
Abstract: Characterization of silicon kerf from photovoltaic silicon-wafer production was carried out. Also, SiC powder was synthesized using high purity silicon kerf by varying grinding conditions. With increase of grinding time, surface of the silicon was oxidized to form silicon oxide. Also, it was observed that the unreacted silicon oxide and free silicon amount in the SiC powder increases with an increasing grinding times, even though silicon particle size of the starting material is decreased.
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