Journal of Powder Materials

Hyeong-Jun Kim

2 Articles

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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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

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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