Journal of Powder Materials

Sung-Min Lee

7 Articles

Preparation of Suspension in La₂O₃-Gd₂O₃-ZrO₂ System via Planetary Mill and Characteristics of (La_1-xGd_x)₂Zr₂O₇ Coatings Fabricated via Suspension Plasma Spray: Chang-Sup Kwon, Sung-Min Lee, Yoon-Suk Oh, Hyung-Tae Kim, Byung-Koog Jang, Seongwon Kim; J Powder Mater. 2013;20(6):453-459.; DOI: https://doi.org/10.4150/KPMI.2013.20.6.453

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Lanthanum/gadolinium zirconate coatings are deposited via suspension plasma spray with suspensions fabricated by a planetary mill and compared with hot-pressed samples via solid-state reaction. With increase in processing time of the planetary mill, the mean size and BET surface area change rapidly in the case of lanthanum oxide powder. By using suspensions of planetary-milled mixture between lanthanum or gadolinium oxide and nano zirconia, dense thick coatings with fully-developed pyrochlore phases are obtained. The possibilities of these SPS-prepared coatings for TBC application are also discussed.

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Phase Equilibria in the ZrO2–La2O3–Gd2O3 System at 1600°C
E.R. Andrievskaya, O.A. Kornienko, A.I. Bykov, A.V. Sameliuk
Powder Metallurgy and Metal Ceramics.2020; 58(11-12): 714. CrossRef
Characteristics of Bulk and Coating in Gd2−xZr2+xO7+0.5x(x = 0.0, 0.5, 1.0) System for Thermal Barrier Coatings
Sun-Joo Kim, Sung-Min Lee, Yoon-Suk Oh, Hyung-Tae Kim, Byung-Koog Jang, Seongwon Kim
Journal of the Korean Ceramic Society.2016; 53(6): 652. CrossRef
Fabrication and Characterization of Ceramics and Thermal Barrier Coatings of Lanthanum Zirconate with Reduced Rare-earth Contents in the La2O3-ZrO2 System
Chang-Sup Kwon, Sujin Lee, Sung-Min Lee, Yoon-Suk Oh, Hyung-Tae Kim, Byung-Koog Jang, Seongwon Kim
Journal of Korean Powder Metallurgy Institute.2015; 22(6): 413. CrossRef
Structure and Thermal Conductivity of Thermal Barrier Coatings in Lanthanum/Gadolinium Zirconate System Fabricated via Suspension Plasma Spray
Chang-Sup Kwon, Sung-Min Lee, Yoon-Suk Oh, Hyung-Tae Kim, Byung-Koog Jang, Seongwon Kim
Journal of the Korean institute of surface engineering.2014; 47(6): 316. CrossRef

Phase Evolution and Thermal Conductivities of (La_1-xGd_x)₂Zr₂O₇ Oxides for Thermal Barrier Coatings: Chang-Sup Kwon, Sung-Min Lee, Yoon-Suk Oh, Hyung-Tae Kim, Byung-Koog Jang, Seong Won Kim; J Korean Powder Metall Inst. 2012;19(6):429-434.; DOI: https://doi.org/10.4150/KPMI.2012.19.6.429

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With increase in operating temperature of gas turbine for higher efficiency, it is necessary to find new materials of TBC for replacement of YSZ. Among candidate materials for future TBCs, zirconate-based oxides with pyrochlore and fluorite are prevailing ones. In this study, phase structure and thermal conductivities of (La_1-xGd_x)_2Zr_2O_7 oxide system are investigated. (La_1-xGd_x)_2Zr_2O_7 system are comprised by selecting La3+/Gd3+ as A-site ions and Zr4+ as B-site ion in A_2B_2O_7 pyrochlore structures. With powder mixture from each oxide, (La_1-xGd_x)_2Zr_2O_7 oxides are fabricated via solid-state reaction at 1600°C. Either pyrochlore or fluorite or mixture of both appears after heat treatment. For the developed phases along (La_1-xGd_x)_2Zr_2O_7 compositions, thermal conductivities are examined, with which the potential of (La_1-xGd_x)_2Zr_2O_7 compositions for TBC application is also discussed.

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Fabrication and Characterization of Ceramics and Thermal Barrier Coatings of Lanthanum Zirconate with Reduced Rare-earth Contents in the La2O3-ZrO2 System
Chang-Sup Kwon, Sujin Lee, Sung-Min Lee, Yoon-Suk Oh, Hyung-Tae Kim, Byung-Koog Jang, Seongwon Kim
Journal of Korean Powder Metallurgy Institute.2015; 22(6): 413. CrossRef
Preparation of Suspension in La2O3-Gd2O3-ZrO2System via Planetary Mill and Characteristics of (La1-xGdx)2Zr2O7Coatings Fabricated via Suspension Plasma Spray
Chang-Sup Kwon, Sung-Min Lee, Yoon-Suk Oh, Hyung-Tae Kim, Byung-Koog Jang, Seongwon Kim
Journal of Korean Powder Metallurgy Institute.2013; 20(6): 453. CrossRef
Fabrication and Characteristics of Yttria-stabilized Zirconia (7.5 wt% Y2O3-ZrO2) Coating Deposited via Suspension Plasma Spray
Won-Jun Lee, Chang-Sup Kwon, Seongwon Kim, Yoon-Suk Oh, Hyung-Tae Kim, Dae-Soon Lim
Journal of Korean Powder Metallurgy Institute.2013; 20(6): 445. CrossRef

Effect of the Size and Amount of SiC on the Microstructures and Thermal Conductivities of ZrB₂-SiC Composite Ceramics: Seong-Won Kim, Chang-Sup Kwon, Yoon-Suk Oh, Sung-Min Lee, Hyung-Tae Kim; J Korean Powder Metall Inst. 2012;19(5):379-384.; DOI: https://doi.org/10.4150/KPMI.2012.19.5.379

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This paper reports the microstructures and thermal conductivities of ZrB_2-SiC composite ceramics with size and amount of SiC. We fabricated sintered bodies of ZrB_2-x vol.% SiC (x=10, 20, 30) with submicron and nanosized SiC densified by spark plasma sintering. Microstructure retained the initial powder size of especially SiC, except the agglomeration of nanosized SiC. For sintered bodies, thermal conductivities were examined. The observed thermal conductivity values are 40~60 W/mK, which is slightly lower than the reported values. The relation between microstructural parameter and thermal conductivity was also discussed.

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Analysis of Polymer Hybrid-coated Anodic Aluminum Oxide
Mira Kim, Yeongwoo Kim, Hakyoung Lee, Chan-Young Park, Won-Ki Lee, Taeho Kang, Kwon Taek Lim
Molecular Crystals and Liquid Crystals.2015; 622(1): 120. CrossRef
Thermal Properties of Diamond Aligned Electroless Ni Plating Layer/Oxygen Free Cu Substrates
Da-Woon Jeong, Song-Yi Kim, Kyoung-Tae Park, Seok-Jun Seo, Taek Soo Kim, Bum Sung Kim
Journal of Korean Powder Metallurgy Institute.2015; 22(2): 134. CrossRef
Effect of the SiC Size on the Thermal and Mechanical Properties of Reaction-bonded Silicon Carbide Ceramics
Chang-Sup Kwon, Yoon-Suk Oh, Sung-Min Lee, Yoonsoo Han, Hyun-Ick Shin, Youngseok Kim, Seongwon Kim
Journal of Korean Powder Metallurgy Institute.2014; 21(6): 467. CrossRef

Phase Evolution and Thermo-physical Properties of La₂(Zr_1-xHf_x)₂O₇ Oxides for Thermal Barrier Coatings: Seong-Won Kim, Sung-Min Lee, Yoon-Suk Oh, Hyung-Tae Kim, Byung-Koog Jang; J Korean Powder Metall Inst. 2011;18(6):568-574.; DOI: https://doi.org/10.4150/KPMI.2011.18.6.568

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As operating temperatures of engines or turbines continually increase for higher efficiency, significant amounts of researches have been focused on finding new materials, which would be alternatives to conventional yttria-stabilized zirconia (YSZ) for thermal barrier coatings (TBCs). In this study, phase evolution and thermo-physical properties of La_2(Zr_1-xHf_x)_2O_7 pyrochlore systems are investigated for TBC applications. La_2(Zr_1-xHf_x)_2O_7 systems are comprised by selecting La3+ as A-site ions and Zr4+/Hf4+ as B-site ions in A_2B_2O_7 pyrochlore structures. For the developed phases in La_2(Zr_1-xHf_x)_2O_7 compositions, thermo-physical properties such as thermal conductivity, thermal expansion coefficient are examined. The potential of these La_2(Zr_1-xHf_x)_2O_7 compositions for TBC application is also discussed.

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Preparation of Suspension in La2O3-Gd2O3-ZrO2System via Planetary Mill and Characteristics of (La1-xGdx)2Zr2O7Coatings Fabricated via Suspension Plasma Spray
Chang-Sup Kwon, Sung-Min Lee, Yoon-Suk Oh, Hyung-Tae Kim, Byung-Koog Jang, Seongwon Kim
Journal of Korean Powder Metallurgy Institute.2013; 20(6): 453. CrossRef
Phase Evolution and Thermal Conductivities of (La1-xGdx)2Zr2O7Oxides for Thermal Barrier Coatings
Chang-Sup Kwon, Sung-Min Lee, Yoon-Suk Oh, Hyung-Tae Kim, Byung-Koog Jang, Seong Won Kim
Journal of Korean Powder Metallurgy Institute.2012; 19(6): 429. CrossRef

Phase Evolution and Thermo-physical Properties of Rare-earth Oxides for Thermal Barrier Systems: Byung-Chul Shim, Kil-Ho Kwak, Sung-Min Lee, Yoon-Suk Oh, Hyung-Tae Kim, Byung-Koog Jang, Seong-Won Kim; J Korean Powder Metall Inst. 2010;17(2):148-153.; DOI: https://doi.org/10.4150/KPMI.2010.17.2.148

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Thermal barrier systems have been widely investigated over the past decades, in order to enhance reliability and efficiency of gas turbines at higher temperatures. Yttria-stabilized zirconia (YSZ) is one of the most leading materials as the thermal barriers due to its low thermal conductivity, thermodynamic stability, and thermal compatibility with metal substrates. In this work, rare-earth oxides with pyrochlore phases for thermal barrier systems were investigated. Pyrochlore phases were successfully formed via solid-state reactions started from rare-earth oxide powders. For the heat-treated samples, thermo-physical properties were examined. These rare-oxide oxides showed thermal expansion of 9sim12times10-6/K and thermal conductivity of 1.2~2.4 W/mK, which is comparable with the thermal properties of YSZ.

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Phase Evolution and Thermal Conductivities of (La1-xGdx)2Zr2O7Oxides for Thermal Barrier Coatings
Chang-Sup Kwon, Sung-Min Lee, Yoon-Suk Oh, Hyung-Tae Kim, Byung-Koog Jang, Seong Won Kim
Journal of Korean Powder Metallurgy Institute.2012; 19(6): 429. CrossRef
Phase Evolution and Thermo-physical Properties of La2(Zr1-xHfx)2O7Oxides for Thermal Barrier Coatings
Seong-Won Kim, Sung-Min Lee, Yoon-Suk Oh, Hyung-Tae Kim, Byung-Koog Jang
Journal of Korean Powder Metallurgy Institute.2011; 18(6): 568. CrossRef

Fabrication of ZrB₂-based Composites for Ultra-high Temperature Materials: Seong-Won Kim, Jung-Min Chae, Sung-Min Lee, Yoon-Suk Oh, Hyung-Tae Kim, Sahn Nahm; J Korean Powder Metall Inst. 2009;16(6):442-448.; DOI: https://doi.org/10.4150/KPMI.2009.16.6.442

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ZrB_2-based composites are candidate materials for ultra-high temperature materials (UHTMs). ZrB_2 has become an indispensable ingredient in UHTMs, due to its high melting temperature, relatively low density, and excellent resistance to thermal shock or oxidation. ZrB_2 powders are usually synthesized by solid state reactions such as carbothermal, borothermal, or combined carbothermal reaction. SiC is added to this system in order to enhance the oxidation resistance of ZrB_2. In this study, ZrB_2?based composites were successfully synthesized and densified through two different processing paths. ZrB_2 or ZrB_2 25 vol.%SiC was fully synthesized from oxide starting materials with reducing agents after heat treatment at 1400°C. Besides, ZrB_2?20 vol.%SiC was fully densified with B_4C as a sintering additive after hot pressing at 1900°C. The synthesis mechanism and the effect of sintering additives on densification of ZrB_2 ?SiC composites were also discussed.

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The Effect of Sintering Processes and Additives on the Microstructures and Mechanical Properties of ZrB2-SiC Composite Ceramics
Chang-Sup Kwon, Jung-Min Chae, Hyung-Tae Kim, Kyung-Ja Kim, Seong-Won Kim
Journal of Korean Powder Metallurgy Institute.2011; 18(6): 562. CrossRef

Measurement of High Temperature Dielectric Property at Microwave Frequency Using Cavity Perturbation Method: Dong-Eun Kim, Jin-Ho Jung, Sung-Min Lee, Hyung-Tae Kim; J Korean Powder Metall Inst. 2006;13(6):455-461.; DOI: https://doi.org/10.4150/KPMI.2006.13.6.455

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High temperature dielectric constants of the various ceramic materials have been measured using cavity perturbation method. The measurements were applied to refractory, traditional and fine ceramic powder compacts from room temperature to 1200°C. Calibration constant in the equation suggested by Hutcheon et al., was determined from the dielectric constants of reference specimen (teflon and alumina) at room temperature. From these results, informations on the refectory materials were obtained for the microwave kiln design and understanding of the microwave heating effects of ceramics have been improved.

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Dielectric Properties of β-SiAlON at High Temperature Using Perturbation Method
Young Hoon Seong, Ha Neul Kim, Do Kyung Kim
Key Engineering Materials.2008; 403: 121. CrossRef

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