- Effects of Chemical Composition and Particle Size of Starting Aluminum Source on the Spheroidization in the Flame Fusion Process
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Sun-Hui Eom, Jae-Hwan Pee, Jong-Keun Lee, Kwang-Taek Hwang, Woo-Seok Cho, Kyeong-Ja Kim
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J Korean Powder Metall Inst. 2009;16(6):431-437.
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DOI: https://doi.org/10.4150/KPMI.2009.16.6.431
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- Various inorganic fillers improve the thermal conductivity and physical properties of organic products. Alumina has been used a representative filler in the heat radiation sheet for the heat radiation of electric device. The high filling rate of alumina increases the thermal conductivity and properties of products. We successfully developed the spherical alumina by flame fusion process using the oxygen burner with LPG fuel. In the high temperature flame (2500sim3000°C) of oxygen burner, sprayed powders were melting and then rotated by carrier gas. This surface melting and rotation process made spherical alumina. Especially effects of chemical composition and particle size of stating materials on the melting behavior of starting materials in the flame and spheroidization ratio were investigated. As a result, spheroidization ratio of boehmite and aluminum hydroxide with endothermic reaction of dehydration process was lower than that of the sintered alumina without dehydration reaction.
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Citations to this article as recorded by  - Comparative Analysis of Commercial Al2O3 Powders and the Dispersion Characteristics of Slurries Produced Using Them
Mo-Se Kwon, Seung-Joon Yoo, Jin-Ho Kim, Kyoung-Hoon Jeong, Jong-Keun Lee, Ung-Soo Kim
Korean Journal of Materials Research.2024; 34(1): 27. CrossRef - Fabrication and Characterization of Al2O3-Siloxane Composite Thermal Pads for Thermal Interface Materials
Seul-Ki Kim, Yeong-Jin Koo, Hyun Sik Kim, Jong-Keun Lee, Kyounghoon Jeong, Younki Lee, Eun Young Jung
Materials.2024; 17(4): 914. CrossRef
- Effects of Doping Elements and the Amounts of Oxygen/Nitrogen Contents in Final Nitrides on the Characteristics of Red Pigment of Tantalum Nitrides (Ta3N5)
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Eun-Young Park, Jae-Hwan Pee, Yoo-Jin Kim, Woo-Seok Cho, Kyeong-Ja Kim
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J Korean Powder Metall Inst. 2009;16(6):396-402.
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DOI: https://doi.org/10.4150/KPMI.2009.16.6.396
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- Tantalum nitrides (Ta_3N_5) have been developed to substitute the Cd based pigments for non-toxic red pigment. Various doping elements were doped to reduce the amount of high price Tantalum element used and preserve the red color tonality. Doping elements were added in the synthesizing process of precursor of amorphous tantalum oxides and then Tantalum nitrides doped with various elements were obtained by ammonolysis process. The average particle size of final nitrides with secondary phases was larger than the nitride without the secondary phases. Also secondary phases reduced the red color tonality of final products. On the other hand, final nitrides without secondary phase had orthorhombic crystal system and presented good red color. In other words, in the case of nitrides without secondary phases, doping elements made a solid solution of tantalum nitride. In this context, doping process controlled the ionic state of nitrides and the amount of oxygen/nitrogen in final nitrides affected the color tonality.
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