- [Korean]
- Comparison of the Properties of Rare-Earth Zirconate Thermal Barrier Coatings for Hydrogen-Fueled Gas Turbines
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Gun-Woong Lee, Min-Soo Nam, Min-Ji Kim, HyunSuk Jung, Seongwon Kim
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J Powder Mater. 2025;32(6):472-480. Published online December 31, 2025
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DOI: https://doi.org/10.4150/jpm.2025.00423
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 Abstract
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- Thermal barrier coatings (TBCs) for hydrogen-fueled gas turbines withstand higher combustion temperatures and increased steam concentrations compared to conventional natural-gas systems. These harsh operating conditions significantly accelerate the thermal degradation of widely used YSZ coatings, emphasizing the need for alternative top-coat materials with improved phase stability and reduced thermal conductivity. In this study, rare-earth zirconate ceramics, Gd2Zr2O7 (GdZO), Tm2Zr2O7 (TmZO), and a mixed composition (Gd0.5Tm0.5)2Zr2O7 (Gd/TmZO), are synthesized and investigated as potential next-generation TBC candidates. Each material was comparatively examined with a focus on crystal structure, thermophysical properties, and thermal conductivity. Furthermore, high-temperature steam exposure experiments were performed to simulate hydrogen combustion environments. Microstructural analyses, high-temperature degradation behavior, and phase stability evaluations were carried out to obtain fundamental experimental data. This study provides essential baseline information for the design and development of high-performance TBC materials suitable for the hydrogen-fueled gas turbine systems.
- [Korean]
- Synthesis of Highly Dispersible Metal Nanoparticles in P3HT:PCBM Layers and Their Effects on the Performance of Polymer Solar Cells
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Min-Ji Kim, Gyu-Chae Choi, Young-Kuk Kim, Yang-Do Kim, Youn-Kyoung Baek
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J Korean Powder Metall Inst. 2014;21(3):179-184. Published online June 1, 2014
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DOI: https://doi.org/10.4150/KPMI.2014.21.3.179
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Abstract
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In this study, we prepare polymer solar cells incorporating organic ligand-modified Ag nanoparticles (OAgNPs) highly dispersed in the P3HT:PCBM layer. Ag nanoparticles decorated with water-dispersible ligands (WAgNPs) were also utilized as a control sample. The existence of the ligands on the Ag surface was confirmed by FTIR spectra. Metal nanoparticles with different surface chemistries exhibited different dispersion tendencies. O-AgNPs were highly dispersed even at high concentrations, whereas W-AgNPs exhibited significant aggregation in the polymer layer. Both dispersion and blending concentration of the Ag nanoparticles in P3HT:PCBM matrix had critical effects on the device performance as well as light absorption. The significant changes in short-circuit current density (JSC) of the solar cells seemed to be related to the change in the polymer morphology according to the concentration of AgNPs introduced. These findings suggested the importance of uniform dispersion of plasmonic metal nanoparticles and their blending concentration conditions in order to boost the solar cell performance.
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