The University of Tokyo · Materials Science
Professor Fei Shen Ong's research lab specializes in advanced ceramic processing, with a focus on flash sintering techniques to achieve high-density, high-performance ceramics at reduced temperatures. The lab investigates the microstructural evolution, phase stability, and mechanical reliability of zirconia-based ceramics, particularly in mitigating low-temperature degradation and enhancing toughness. A key research direction involves developing scalable and reproducible sintering strategies—such as current-ramp flash sintering and optimized electrode configurations—for advanced ceramics and their joints with metals, especially in aerospace and high-temperature applications.
Figures are computed from collected data and may differ slightly.
Abstract This study presents a strategy to achieve over 99% relative density in monophasic tetragonal 1.5‐mol% yttria‐stabilized zirconia (1.5YSZ) polycrystalline ceramics via current‐ramp flash (CRF) sintering at furnace temperatures as low as 600°C. While 1.5YSZ exhibits high toughness, it is prone to cracking due to spontaneous tetragonal‐to‐monoclinic (T → M) phase transformation when grain sizes exceed a critical threshold. The proposed strategy combines preheating with multi‐step CRF sinte
Flash sintering enables rapid densification of ceramic materials, but challenges with reproducibility and scalability persist. This study investigates the effects of electrode configuration and sample surface-area-to-volume ( S / V ) on grain growth and densification in 3 mol% yttria-stabilized zirconia ceramics flash sintered using two common electrical contact methods: coil configuration (wire wrapped around sample ends) and plate configuration (flat electrodes contacting the ends). As the S /
This study demonstrates the effectiveness of current-ramp flash sintering in producing near-full-density 3-mol% yttria-stabilized tetragonal zirconia ceramics with improved resistance to low-temperature degradation (LTD) compared to conventionally sintered samples. LTD, driven by the spontaneous tetragonal-to-monoclinic phase transformation in humid environments, results in surface microcracking and gradual loss of structural integrity. A comparative analysis of near-full-density samples with si
Abstract The growing demand for lightweight, heat‐resistant aerospace structures with intricate geometries has driven the integration of non‐oxide ceramics and Ti alloys, addressing the inherent workability and scalability challenges associated with ceramics when used independently. Brazing with eutectic Ag–Cu‐based fillers has emerged as a pivotal technique for fabricating reliable joints between these dissimilar materials. This paper provides a focused overview of strategies to enhance the mec
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