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2 "Tae-jun Park"
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Effect of TiO2 Content on High-Temperature Degradation Behavior of Nd2O3 and Yb2O3 Doped YSZ Composite Materials
Gye-Won Lee, Seonung Choi, Tae-jun Park, Jong-il Kim, In-hwan Lee, Yoon-seok Oh
J Powder Mater. 2024;31(5):431-436.   Published online October 31, 2024
DOI: https://doi.org/10.4150/jpm.2024.00269
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Hot section components of gas turbines are exposed to a high operating temperature environment. To protect these components, thermal barrier coatings (TBC) are applied to their surfaces. Yttria-stabilized zirconia (YSZ), which is widely used as a TBC material, faces limitations at temperatures above 1200℃. To mitigate these issues, research has focused on adding lanthanide rare earth oxides and tetravalent oxides to prevent the phase-transformation of the monoclinic phase in zirconia. This study investigated the effects of varying TiO2 content in Nd2O3 and Yb2O3 co-doped YSZ composites. Increasing TiO2 content effectively suppressed formation of the monoclinic phase and increased the thermal degradation resistance compared to YSZ in environments over 1200℃. These findings will aid in developing more thermally stable and efficient TBC materials for application in high-temperature environments.
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Tribological Behavior Analysis of WC-Ni-Cr + Cr3C2 and WC-Ni-Cr + YSZ Coatings Sprayed by HVOF
Tae-Jun Park, Gye-Won Lee, Yoon-Suk Oh
J Powder Mater. 2023;30(5):415-423.   Published online October 1, 2023
DOI: https://doi.org/10.4150/KPMI.2023.30.5.415
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With the increasing attention to environmental pollution caused by particulate matter globally, the automotive industry has also become increasingly interested in particulate matter, especially particulate matter generated by automobile brake systems. Here, we designed a coating composition and analyzed its mechanical properties to reduce particulate matter generated by brake systems during braking of vehicles. We designed a composition to check the mechanical properties change by adding Cr3C2 and YSZ to the WC-Ni-Cr composite composition. Based on the designed composition, coating samples were manufactured, and the coating properties were analyzed by Vickers hardness and ball-on-disk tests. As a result of the experiments, we found that the hardness and friction coefficient of the coating increased as the amount of Cr3C2 added decreased. Furthermore, we found that the hardness of the coating layer decreased when YSZ was added at 20vol%, but the friction coefficient was higher than the composition with Cr3C2 addition.


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