Journal of Powder Materials

[Korean]
Manufacturing and Properties of CGI-based Composite Coating Layer Utilizing a Warm Spray Process and Cu-Ga and Cu-In Mixed Powders: Min-Gwang Jeon, Myeong-Ju Lee, Hyeong-Jun Kim, Kee-Ahn Lee; J Korean Powder Metall Inst. 2014;21(3):229-234. Published online June 1, 2014; DOI: https://doi.org/10.4150/KPMI.2014.21.3.229

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This study manufactured a CIG-based composite coating layer utilizing a new warm spray process, and a mixed powder of Cu-20at.%Ga and Cu-20at.%In. In order to obtain the mixed powder with desired composition, the Cu-20at.%Ga and Cu-20at.%In powders were mixed with a 7:1 ratio. The mixed powder had an average particle size of 35.4 μm. Through the utilization of a warm spray process, a CIG-based composite coating layer of 180 μm thickness could be manufactured on a pure Al matrix. To analyze the microstructure and phase, the warm sprayed coating layer underwent XRD, SEM/EDS and EMPA analyses. In addition, to improve the physical properties of the coating layer, an annealing heat treatment was conducted at temperatures of 200°C, 400°C and 600°C for 1 hour each. The microstructure analysis identified α-Cu, Cu₄In and Cu₃Ga phases in the early mixed powder, while Cu₄In disappeared, and additional Cu₉In₄ and Cu₉Ga₄ phases were identified in the warm sprayed coating layer. Porosity after annealing heat treatment reduced from 0.75% (warm sprayed coating layer) to 0.6% (after 600°C/1 hr. heat treatment), and hardness reduced from 288 Hv to 190 Hv. No significant phase changes were found after annealing heat treatment.

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Fabrication and Microstructure/Properties of Bulk-typeTantalum Material by a Kinetic Spray Process
Ji-Hye Lee, Ji-Won Kim, Kee-Ahn Lee
Journal of Korean Powder Metallurgy Institute.2016; 23(1): 8. CrossRef
Effect of Heat Treatment Environment on the Microstructure and Properties of Kinetic Sprayed Tantalum Coating Layer
Ji-Hye Lee, Hyung-Jun Kim, Kee-Ahn Lee
Journal of Korean Powder Metallurgy Institute.2015; 22(1): 32. CrossRef

[Korean]
Thermo-Mechanical Properties of Al₂TiO₅ Ceramics Stabilized with MgO and ZrO₂ Additives: Da-Mi Kim, Hyung-Tae Kim, Hyeong-Jun Kim, Ik-Jin Kim, Seong-Cheol Choi, Yong-Chan Kim, Jung NamKung, Sung-Soo Ryu; J Korean Powder Metall Inst. 2012;19(4):253-258.; DOI: https://doi.org/10.4150/KPMI.2012.19.4.253

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The characteristics of Al_2TiO_5 ceramics were influenced by the additives and the heat treatment that controls the microcrack behavior at grain boundaries. The effect of additives on Al_2TiO_5 ceramics were investigated in terms of mechanical properties and thermal expansion at high temperature. The Al_2TiO_5 were synthesized at 1500°C, 1550°C and 1600°C for 2h by reaction sintering. The formation of Al_2TiO_5 phase was increased by additives that enhanced the volume of the microcrack that can lead to low thermal expansion. The mechanical properties of the stabilized Al_2TiO_5 ceramics were increased remarkably at 1100°C, 1200°C and 1300°C due to the oneset of mechanical healing of grain-bondary microcracks at a high temperature. The amount of microcrack was decreased at lower sintering temperature that causes the increase of mechanical properties at high temperature.

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Citations to this article as recorded by

Stabilization of thermal storage ceramics via the phase reconstruction of ferrotitanium slag and migration of Mg element
Mengting Jiang, Xiaopeng Li, Tengfei Deng
Journal of the American Ceramic Society.2025;[Epub] CrossRef
The influence of different additives on microstructure and mechanical properties of aluminum titanate ceramics
Weiwei Chen, Anze Shui, Qingliang Shan, Jiawei Lian, Cong Wang, Jianqiao Li
Ceramics International.2021; 47(1): 1169. CrossRef

[Korean]
Feasibility Test for Mechanical Property Characterization of BaTiO₃ Ceramics for MLCC Application Using Nanoindentation: Sung-Soo Ryu, Seong-Won Kim, Hyeong-Jun Kim, Hyung-Tae Kim; J Korean Powder Metall Inst. 2009;16(1):37-42.; DOI: https://doi.org/10.4150/KPMI.2009.16.1.037

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Abstract PDF: In this study, the feasible test for the mechanical property characterization of BaTiO_3 ceramics and multi-layer ceramic capacitor(MLCC) was performed with nanoindentation technique. In case of BaTiO_3 ceramics, hardness and elastic modulus are dependent on the densification of specimen showing the highest hardness and elastic modulus values of 12.3 GPa and 155 GPa, respectively at 1260°C. In case of MLCC chip, hardness of dielectric layer was lower than that of margin region. The nanoindentation method could be useful tool for the measurement of mechanical property within BaTiO_3 dielectric layer of very thin thickness in high capacitance MLCC.

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