Flash Spark Plasma Sintering of 3YSZ: Modified sintering pathway and impact on grain boundary formation |
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| Affiliation: | 1. CIRIMAT, CNRS-INP-UPS, Université Toulouse 3 – Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France;2. CNRS, Université de Bordeaux, ICMCB, UMR 5026, 87 Avenue du Dr A. Schweitzer, 33608, Pessac, France;3. Department of Materials Science and Engineering, Technion – Israel Institute of Technology, Haifa 32000, Israel;1. Université de Toulouse, CIRIMAT, CNRS INPT UPS, Université Paul Sabatier, 118 route de Narbonne, 31062, Toulouse cedex 9, France;2. SAFRAN Aircraft Engines, 2 Rue Henri Auguste Desbruères, 91100, Corbeil-Essonnes, France;1. Institute of Inorganic Chemistry, University of Cologne, Greinstr. 6, 50939, Cologne, Germany;2. Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstr. 15, 45141, Essen, Germany;1. Postgraduate Programme in Materials Science and Engineering, University of São Paulo, USP/FZEA, Av. Duque de Caxias Norte, 225, 13635-900, Pirassununga, Brazil;2. Forschungszentrum Jülich, Institute for Energy and Climate Research (IEK-1), 52425, Jülich, Germany;3. Federal University of Alfenas, José Aurelio Vilela, 11999, Cidade Universitária, BR 267, Km 533, Poços de Caldas, MG, 37715-400, Brazil;4. Department of Biosystem Engineering, Faculty of Animal Science and Food Engineering (FZEA), University of São Paulo (USP), 13635-900, Pirassununga, SP, Brazil |
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| Abstract: | Yttria stabilized zirconia (3 mol% YSZ) ceramics were prepared by Flash-SPS, while allowing high heating rates up to 200 °C/s, which led to the extremely fast densification within a few seconds. The high heating rates had strong impact on sintering mechanisms, in terms of densification and grain growth. While the specimens ended with 5–15 vol% porosity and limited grain growth (< 350 nm), their hardness is higher than fully dense counterpart SPSed ceramics. Using the sintering trajectories, microstructural observations, and impedance spectroscopy, we highlight altered sintering mechanism which resulted in very thin grain boundaries compared to SPS. It appears that densification is largely advanced at grain boundary interfaces, with no residual nano-pores at the grain junctions, where some pores with size comparable to grain size were present. This opens up opportunities for the fabrication of porous lightweight ceramics with good mechanical properties. |
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| Keywords: | Flash-SPS Grain boundary Zirconia |
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