Journal of Powder Materials

Sung-Goon Kang

3 Articles

Synthesis and Phase Transformation Behavior of YAG Powders by a Mechanochemical Solid Reaction: Hyun-Gi Jung, Gil-Ho Hwang, Kwang-Young Lim, Young-Hun Lee, Sung-Goon Kang; J Korean Powder Metall Inst. 2006;13(4):243-249.; DOI: https://doi.org/10.4150/KPMI.2006.13.4.243

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Yttrium aluminum garnet (YAG) powders were synthesized via mechanochemical solid reaction using Y_2O_3 with three types of aluminum compounds. Y_2O_3 reacted mechanochemically with all A1 compounds and formed YAM (yttrium aluminum monoclinic), YAG and YAP (yttrium aluminum perovskite) phases depending on the starting materials. The ground samples containing gamma-A1_2O_3 showed the best reactivity, whereas the ground sample containing A100H, which had the largest surface area, exhibited pure YAG after calcination at 1200°C. The sample containing Al had the least reactivity, producing YAP along with YAG at 1200°C. The types and grinding characteristics of the starting materials and grinding time are believed to be important factors in the mechanochemical synthesis of YAG.

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Optical Properties of Spherical YAG:Ce³⁺ Phosphor Powders Synthesized by Atmospheric Plasma Spraying Method Appling PVA Solution Route and Domestic Aluminium Oxide Seed
Yong-Hyeon Kim, Sang-Jin Lee
journal of Korean Powder Metallurgy Institute.2023; 30(5): 424. CrossRef
Pulverization and Densification Behavior of YAG Powder Synthesized by PVA Polymer Solution Method
Hyun-Ho Im, Sang-Jin Lee
Korean Journal of Materials Research.2020; 30(11): 573. CrossRef
Synthesis of YAG:Ce3+ phosphor powders employing several types of alumina seeds
A-Reum Kim, Yong-Hyeon Kim, Sang-Jin Lee
Metals and Materials International.2015; 21(2): 324. CrossRef
Effect of PVA Polymerization on Synthesis of YAG:Ce3+Phosphor Powders Prepared by a Solid-liquid Hybrid Route
A-Reum Kim, Sang-Jin Lee
Journal of the Korean Ceramic Society.2014; 51(5): 424. CrossRef
Synthesis of YAG:Ce3+Phosphor Powders by Polymer Solution Route and Alumina Seed Application
Yong-Hyeon Kim, Sang-Jin Lee
Journal of Korean Powder Metallurgy Institute.2013; 20(1): 37. CrossRef

Densification and Some Properties of Carbon Nanotubes-Dispersed Al₂O₃ Nanocomposite Powders: Seung-Hwa Yoo, Jae-Kyo Yang, Sung-Tag Oh, Kae-Myung Kang, Sung-Goon Kang, Yong-Ho Choa; J Korean Powder Metall Inst. 2005;12(6):393-398.; DOI: https://doi.org/10.4150/KPMI.2005.12.6.393

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Abstract PDF: In-situ processing route was adopted to disperse carbon nanotubes (CNTs) into Al_2O_3 powders homogeneously. The Al_2O_3 composite powders with homogeneous dispersion of CNTs could be synthesized by a catalytic route for in-situ formation of CNTs on nano-sized Fe dispersed Al_2O_3 powders. CNTs/Fe/Al_2O_3 nanopowders were densified by spark plasma sintering (SPS). The hardness and bending strength as well as electrical conductivity increased with increasing sintering temperature. However, the electrical conductivity of the composites sintered at above 1500°C showed decreased value with increasing sintering temperature due to the oxidation of CNTs.

Synthesis and Characterization of CNTs/Metal/Al₂O₃ Nanocomposite Powders by Thermal CVD: Yong-Ho Choa, Seung-Hwa Yoo, Jae-Kyo Yang, Sung-Tag Oh, Sung-Goon Kang; J Korean Powder Metall Inst. 2005;12(2):146-150.; DOI: https://doi.org/10.4150/KPMI.2005.12.2.146

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Abstract PDF: An optimum route to synthesize Al_2O_3-based composite powders with homogeneous dispersion of carbon nanotubes (CNTs) was investigated. CNTs/Metal/Al_2O_3 nanocomposite powders were fabricated by thermal chemical vapor deposition of C_2H_2 gas over metal/Al_2O_3 nanocomposite catalyst prepared by selective reduction of metal oxide/Al_2O_3 powders. The FT-Raman spectroscopy analysis revealed that the CNTs have single- and multi-walled structure. The CNTs with the diameter of 25-43 nm were homogeneously distributed in the metal/Al_2O_3 powders, and their characteristics were strongly affected by a kind of metal catalyst and catalyst size. The experimental results show that the composite powder with required size and dispersion of CNTs can be realized by control of synthesis condition.

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